version 1.15, 2001/01/11 08:43:23 |
version 1.27, 2003/12/12 03:08:29 |
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* DEVELOPER SHALL HAVE NO LIABILITY IN CONNECTION WITH THE USE, |
* DEVELOPER SHALL HAVE NO LIABILITY IN CONNECTION WITH THE USE, |
* PERFORMANCE OR NON-PERFORMANCE OF THE SOFTWARE. |
* PERFORMANCE OR NON-PERFORMANCE OF THE SOFTWARE. |
* |
* |
* $OpenXM: OpenXM_contrib2/asir2000/lib/bfct,v 1.14 2001/01/10 04:30:35 noro Exp $ |
* $OpenXM: OpenXM_contrib2/asir2000/lib/bfct,v 1.26 2003/10/20 00:58:47 takayama Exp $ |
*/ |
*/ |
/* requires 'primdec' */ |
/* requires 'primdec' */ |
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#define TMP_S ssssssss |
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#define TMP_DS dssssssss |
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#define TMP_T dtttttttt |
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#define TMP_DT tttttttt |
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#define TMP_Y1 yyyyyyyy1 |
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#define TMP_DY1 dyyyyyyyy1 |
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#define TMP_Y2 yyyyyyyy2 |
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#define TMP_DY2 dyyyyyyyy2 |
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if (!module_definedp("gr")) load("gr")$ else{ }$ |
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if (!module_definedp("primdec")) load("primdec")$ else{ }$ |
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module bfct $ |
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/* Empty for now. It will be used in a future. */ |
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endmodule $ |
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/* toplevel */ |
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def bfunction(F) |
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{ |
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V = vars(F); |
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N = length(V); |
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D = newvect(N); |
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for ( I = 0; I < N; I++ ) |
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D[I] = [deg(F,V[I]),V[I]]; |
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qsort(D,compare_first); |
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for ( V = [], I = 0; I < N; I++ ) |
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V = cons(D[I][1],V); |
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return bfct_via_gbfct_weight(F,V); |
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} |
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/* annihilating ideal of F^s */ |
/* annihilating ideal of F^s */ |
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def ann(F) |
def ann(F) |
{ |
{ |
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if ( member(s,vars(F)) ) |
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error("ann : the variable 's' is reserved."); |
V = vars(F); |
V = vars(F); |
N = length(V); |
N = length(V); |
D = newvect(N); |
D = newvect(N); |
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for ( I = N-1, DV = []; I >= 0; I-- ) |
for ( I = N-1, DV = []; I >= 0; I-- ) |
DV = cons(strtov("d"+rtostr(V[I])),DV); |
DV = cons(strtov("d"+rtostr(V[I])),DV); |
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W = append([y1,y2,t],V); |
W = append([TMP_Y1,TMP_Y2,TMP_T],V); |
DW = append([dy1,dy2,dt],DV); |
DW = append([TMP_DY1,TMP_DY2,TMP_DT],DV); |
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B = [1-y1*y2,t-y1*F]; |
B = [1-TMP_Y1*TMP_Y2,TMP_T-TMP_Y1*F]; |
for ( I = 0; I < N; I++ ) { |
for ( I = 0; I < N; I++ ) { |
B = cons(DV[I]+y1*diff(F,V[I])*dt,B); |
B = cons(DV[I]+TMP_Y1*diff(F,V[I])*TMP_DT,B); |
} |
} |
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/* homogenized (heuristics) */ |
/* homogenized (heuristics) */ |
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G1 = []; |
G1 = []; |
for ( T = G0; T != []; T = cdr(T) ) { |
for ( T = G0; T != []; T = cdr(T) ) { |
E = car(T); VL = vars(E); |
E = car(T); VL = vars(E); |
if ( !member(y1,VL) && !member(y2,VL) ) |
if ( !member(TMP_Y1,VL) && !member(TMP_Y2,VL) ) |
G1 = cons(E,G1); |
G1 = cons(E,G1); |
} |
} |
G2 = map(psi,G1,t,dt); |
G2 = map(psi,G1,TMP_T,TMP_DT); |
G3 = map(subst,G2,t,-1-s); |
G3 = map(subst,G2,TMP_T,-1-s); |
return G3; |
return G3; |
} |
} |
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def ann0(F) |
def ann0(F) |
{ |
{ |
V = vars(F); |
F = subst(F,s,TMP_S); |
N = length(V); |
Ann = ann(F); |
D = newvect(N); |
Bf = bfunction(F); |
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for ( I = 0; I < N; I++ ) |
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D[I] = [deg(F,V[I]),V[I]]; |
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qsort(D,compare_first); |
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for ( V = [], I = 0; I < N; I++ ) |
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V = cons(D[I][1],V); |
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for ( I = N-1, DV = []; I >= 0; I-- ) |
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DV = cons(strtov("d"+rtostr(V[I])),DV); |
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/* XXX : heuristics */ |
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W = append([y1,y2,t],reverse(V)); |
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DW = append([dy1,dy2,dt],reverse(DV)); |
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WDW = append(W,DW); |
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B = [1-y1*y2,t-y1*F]; |
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for ( I = 0; I < N; I++ ) { |
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B = cons(DV[I]+y1*diff(F,V[I])*dt,B); |
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} |
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/* homogenized (heuristics) */ |
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dp_nelim(2); |
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G0 = dp_weyl_gr_main(B,WDW,1,0,6); |
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G1 = []; |
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for ( T = G0; T != []; T = cdr(T) ) { |
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E = car(T); VL = vars(E); |
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if ( !member(y1,VL) && !member(y2,VL) ) |
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G1 = cons(E,G1); |
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} |
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G2 = map(psi,G1,t,dt); |
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G3 = map(subst,G2,t,-1-s); |
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/* G3 = J_f(s) */ |
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V1 = cons(s,V); DV1 = cons(ds,DV); V1DV1 = append(V1,DV1); |
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G4 = dp_weyl_gr_main(cons(F,G3),V1DV1,0,1,0); |
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Bf = weyl_minipoly(G4,V1DV1,0,s); |
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FList = cdr(fctr(Bf)); |
FList = cdr(fctr(Bf)); |
for ( T = FList, Min = 0; T != []; T = cdr(T) ) { |
for ( T = FList, Min = 0; T != []; T = cdr(T) ) { |
LF = car(car(T)); |
LF = car(car(T)); |
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if ( dn(Root) == 1 && Root < Min ) |
if ( dn(Root) == 1 && Root < Min ) |
Min = Root; |
Min = Root; |
} |
} |
return [Min,map(subst,G3,s,Min)]; |
return [Min,map(subst,Ann,s,Min,TMP_S,s,TMP_DS,ds)]; |
} |
} |
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def indicial1(F,V) |
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{ |
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W = append([y1,t],V); |
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N = length(V); |
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B = [t-y1*F]; |
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for ( I = N-1, DV = []; I >= 0; I-- ) |
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DV = cons(strtov("d"+rtostr(V[I])),DV); |
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DW = append([dy1,dt],DV); |
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for ( I = 0; I < N; I++ ) { |
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B = cons(DV[I]+y1*diff(F,V[I])*dt,B); |
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} |
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dp_nelim(1); |
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/* homogenized (heuristics) */ |
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G0 = dp_weyl_gr_main(B,append(W,DW),1,0,6); |
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G1 = map(subst,G0,y1,1); |
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G2 = map(psi,G1,t,dt); |
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G3 = map(subst,G2,t,-s-1); |
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return G3; |
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} |
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def psi(F,T,DT) |
def psi(F,T,DT) |
{ |
{ |
D = dp_ptod(F,[T,DT]); |
D = dp_ptod(F,[T,DT]); |
Line 212 def generic_bfct(F,V,DV,W) |
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Line 187 def generic_bfct(F,V,DV,W) |
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N = length(V); |
N = length(V); |
N2 = N*2; |
N2 = N*2; |
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/* If W is a list, convert it to a vector */ |
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if ( type(W) == 4 ) |
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W = newvect(length(W),W); |
dp_weyl_set_weight(W); |
dp_weyl_set_weight(W); |
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/* create a term order M in D<x,d> (DRL) */ |
/* create a term order M in D<x,d> (DRL) */ |
Line 267 def generic_bfct(F,V,DV,W) |
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Line 245 def generic_bfct(F,V,DV,W) |
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return B; |
return B; |
} |
} |
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/* all term reduction + interreduce */ |
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def generic_bfct_1(F,V,DV,W) |
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{ |
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N = length(V); |
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N2 = N*2; |
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/* If W is a list, convert it to a vector */ |
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if ( type(W) == 4 ) |
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W = newvect(length(W),W); |
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dp_weyl_set_weight(W); |
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/* create a term order M in D<x,d> (DRL) */ |
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M = newmat(N2,N2); |
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for ( J = 0; J < N2; J++ ) |
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M[0][J] = 1; |
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for ( I = 1; I < N2; I++ ) |
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M[I][N2-I] = -1; |
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VDV = append(V,DV); |
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/* create a non-term order MW in D<x,d> */ |
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MW = newmat(N2+1,N2); |
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for ( J = 0; J < N; J++ ) |
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MW[0][J] = -W[J]; |
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for ( ; J < N2; J++ ) |
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MW[0][J] = W[J-N]; |
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for ( I = 1; I <= N2; I++ ) |
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for ( J = 0; J < N2; J++ ) |
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MW[I][J] = M[I-1][J]; |
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/* create a homogenized term order MWH in D<x,d,h> */ |
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MWH = newmat(N2+2,N2+1); |
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for ( J = 0; J <= N2; J++ ) |
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MWH[0][J] = 1; |
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for ( I = 1; I <= N2+1; I++ ) |
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for ( J = 0; J < N2; J++ ) |
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MWH[I][J] = MW[I-1][J]; |
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/* homogenize F */ |
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VDVH = append(VDV,[h]); |
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FH = map(dp_dtop,map(dp_homo,map(dp_ptod,F,VDV)),VDVH); |
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/* compute a groebner basis of FH w.r.t. MWH */ |
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/* dp_gr_flags(["Top",1,"NoRA",1]); */ |
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GH = dp_weyl_gr_main(FH,VDVH,0,1,11); |
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/* dp_gr_flags(["Top",0,"NoRA",0]); */ |
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/* dehomigenize GH */ |
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G = map(subst,GH,h,1); |
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/* G is a groebner basis w.r.t. a non term order MW */ |
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/* take the initial part w.r.t. (-W,W) */ |
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GIN = map(initial_part,G,VDV,MW,W); |
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/* GIN is a groebner basis w.r.t. a term order M */ |
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/* As -W+W=0, gr_(-W,W)(D<x,d>) = D<x,d> */ |
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/* find b(W1*x1*d1+...+WN*xN*dN) in Id(GIN) */ |
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for ( I = 0, T = 0; I < N; I++ ) |
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T += W[I]*V[I]*DV[I]; |
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B = weyl_minipoly(GIN,VDV,0,T); /* M represents DRL order */ |
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return B; |
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} |
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def initial_part(F,V,MW,W) |
def initial_part(F,V,MW,W) |
{ |
{ |
N2 = length(V); |
N2 = length(V); |
Line 300 def initial_part(F,V,MW,W) |
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Line 342 def initial_part(F,V,MW,W) |
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def bfct(F) |
def bfct(F) |
{ |
{ |
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/* XXX */ |
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F = replace_vars_f(F); |
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V = vars(F); |
V = vars(F); |
N = length(V); |
N = length(V); |
D = newvect(N); |
D = newvect(N); |
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return Minipoly; |
return Minipoly; |
} |
} |
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/* called from bfct() only */ |
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def indicial1(F,V) |
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{ |
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W = append([y1,t],V); |
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N = length(V); |
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B = [t-y1*F]; |
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for ( I = N-1, DV = []; I >= 0; I-- ) |
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DV = cons(strtov("d"+rtostr(V[I])),DV); |
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DW = append([dy1,dt],DV); |
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for ( I = 0; I < N; I++ ) { |
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B = cons(DV[I]+y1*diff(F,V[I])*dt,B); |
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} |
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dp_nelim(1); |
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/* homogenized (heuristics) */ |
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G0 = dp_weyl_gr_main(B,append(W,DW),1,0,6); |
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G1 = map(subst,G0,y1,1); |
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G2 = map(psi,G1,t,dt); |
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G3 = map(subst,G2,t,-s-1); |
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return G3; |
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} |
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/* b-function computation via generic_bfct() (experimental) */ |
/* b-function computation via generic_bfct() (experimental) */ |
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def bfct_via_gbfct(F) |
def bfct_via_gbfct(F) |
Line 336 def bfct_via_gbfct(F) |
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Line 404 def bfct_via_gbfct(F) |
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for ( I = N-1, DV = []; I >= 0; I-- ) |
for ( I = N-1, DV = []; I >= 0; I-- ) |
DV = cons(strtov("d"+rtostr(V[I])),DV); |
DV = cons(strtov("d"+rtostr(V[I])),DV); |
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B = [t-F]; |
B = [TMP_T-F]; |
for ( I = 0; I < N; I++ ) { |
for ( I = 0; I < N; I++ ) { |
B = cons(DV[I]+diff(F,V[I])*dt,B); |
B = cons(DV[I]+diff(F,V[I])*TMP_DT,B); |
} |
} |
V1 = cons(t,V); DV1 = cons(dt,DV); |
V1 = cons(TMP_T,V); DV1 = cons(TMP_DT,DV); |
W = newvect(N+1); |
W = newvect(N+1); |
W[0] = 1; |
W[0] = 1; |
R = generic_bfct(B,V1,DV1,W); |
R = generic_bfct(B,V1,DV1,W); |
Line 348 def bfct_via_gbfct(F) |
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Line 416 def bfct_via_gbfct(F) |
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return subst(R,s,-s-1); |
return subst(R,s,-s-1); |
} |
} |
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/* use an order s.t. [t,x,y,z,...,dt,dx,dy,dz,...,h] */ |
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def bfct_via_gbfct_weight(F,V) |
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{ |
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N = length(V); |
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D = newvect(N); |
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Wt = getopt(weight); |
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if ( type(Wt) != 4 ) { |
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for ( I = 0, Wt = []; I < N; I++ ) |
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Wt = cons(1,Wt); |
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} |
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Tdeg = w_tdeg(F,V,Wt); |
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WtV = newvect(2*(N+1)+1); |
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WtV[0] = Tdeg; |
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WtV[N+1] = 1; |
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/* wdeg(V[I])=Wt[I], wdeg(DV[I])=Tdeg-Wt[I]+1 */ |
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for ( I = 1; I <= N; I++ ) { |
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WtV[I] = Wt[I-1]; |
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WtV[N+1+I] = Tdeg-Wt[I-1]+1; |
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} |
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WtV[2*(N+1)] = 1; |
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dp_set_weight(WtV); |
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for ( I = N-1, DV = []; I >= 0; I-- ) |
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DV = cons(strtov("d"+rtostr(V[I])),DV); |
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B = [TMP_T-F]; |
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for ( I = 0; I < N; I++ ) { |
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B = cons(DV[I]+diff(F,V[I])*TMP_DT,B); |
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} |
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V1 = cons(TMP_T,V); DV1 = cons(TMP_DT,DV); |
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W = newvect(N+1); |
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W[0] = 1; |
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R = generic_bfct_1(B,V1,DV1,W); |
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dp_set_weight(0); |
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return subst(R,s,-s-1); |
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} |
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/* use an order s.t. [x,y,z,...,t,dx,dy,dz,...,dt,h] */ |
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def bfct_via_gbfct_weight_1(F,V) |
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{ |
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N = length(V); |
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D = newvect(N); |
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Wt = getopt(weight); |
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if ( type(Wt) != 4 ) { |
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for ( I = 0, Wt = []; I < N; I++ ) |
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Wt = cons(1,Wt); |
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} |
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Tdeg = w_tdeg(F,V,Wt); |
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WtV = newvect(2*(N+1)+1); |
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/* wdeg(V[I])=Wt[I], wdeg(DV[I])=Tdeg-Wt[I]+1 */ |
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for ( I = 0; I < N; I++ ) { |
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WtV[I] = Wt[I]; |
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WtV[N+1+I] = Tdeg-Wt[I]+1; |
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} |
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WtV[N] = Tdeg; |
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WtV[2*N+1] = 1; |
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WtV[2*(N+1)] = 1; |
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dp_set_weight(WtV); |
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for ( I = N-1, DV = []; I >= 0; I-- ) |
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DV = cons(strtov("d"+rtostr(V[I])),DV); |
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B = [TMP_T-F]; |
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for ( I = 0; I < N; I++ ) { |
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B = cons(DV[I]+diff(F,V[I])*TMP_DT,B); |
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} |
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V1 = append(V,[TMP_T]); DV1 = append(DV,[TMP_DT]); |
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W = newvect(N+1); |
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W[N] = 1; |
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R = generic_bfct_1(B,V1,DV1,W); |
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dp_set_weight(0); |
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return subst(R,s,-s-1); |
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} |
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def bfct_via_gbfct_weight_2(F,V) |
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{ |
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N = length(V); |
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D = newvect(N); |
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Wt = getopt(weight); |
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if ( type(Wt) != 4 ) { |
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for ( I = 0, Wt = []; I < N; I++ ) |
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Wt = cons(1,Wt); |
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} |
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Tdeg = w_tdeg(F,V,Wt); |
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/* a weight for the first GB computation */ |
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/* [t,x1,...,xn,dt,dx1,...,dxn,h] */ |
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WtV = newvect(2*(N+1)+1); |
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WtV[0] = Tdeg; |
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WtV[N+1] = 1; |
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WtV[2*(N+1)] = 1; |
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/* wdeg(V[I])=Wt[I], wdeg(DV[I])=Tdeg-Wt[I]+1 */ |
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for ( I = 1; I <= N; I++ ) { |
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WtV[I] = Wt[I-1]; |
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WtV[N+1+I] = Tdeg-Wt[I-1]+1; |
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} |
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dp_set_weight(WtV); |
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/* a weight for the second GB computation */ |
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/* [x1,...,xn,t,dx1,...,dxn,dt,h] */ |
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WtV2 = newvect(2*(N+1)+1); |
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WtV2[N] = Tdeg; |
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WtV2[2*N+1] = 1; |
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WtV2[2*(N+1)] = 1; |
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for ( I = 0; I < N; I++ ) { |
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WtV2[I] = Wt[I]; |
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WtV2[N+1+I] = Tdeg-Wt[I]+1; |
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} |
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for ( I = N-1, DV = []; I >= 0; I-- ) |
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DV = cons(strtov("d"+rtostr(V[I])),DV); |
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B = [TMP_T-F]; |
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for ( I = 0; I < N; I++ ) { |
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B = cons(DV[I]+diff(F,V[I])*TMP_DT,B); |
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} |
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V1 = cons(TMP_T,V); DV1 = cons(TMP_DT,DV); |
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V2 = append(V,[TMP_T]); DV2 = append(DV,[TMP_DT]); |
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W = newvect(N+1,[1]); |
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dp_weyl_set_weight(W); |
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VDV = append(V1,DV1); |
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N1 = length(V1); |
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N2 = N1*2; |
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/* create a non-term order MW in D<x,d> */ |
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MW = newmat(N2+1,N2); |
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for ( J = 0; J < N1; J++ ) { |
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MW[0][J] = -W[J]; MW[0][N1+J] = W[J]; |
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} |
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for ( J = 0; J < N2; J++ ) MW[1][J] = 1; |
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for ( I = 2; I <= N2; I++ ) MW[I][N2-I+1] = -1; |
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/* homogenize F */ |
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VDVH = append(VDV,[h]); |
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FH = map(dp_dtop,map(dp_homo,map(dp_ptod,B,VDV)),VDVH); |
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/* compute a groebner basis of FH w.r.t. MWH */ |
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GH = dp_weyl_gr_main(FH,VDVH,0,1,11); |
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/* dehomigenize GH */ |
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G = map(subst,GH,h,1); |
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/* G is a groebner basis w.r.t. a non term order MW */ |
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/* take the initial part w.r.t. (-W,W) */ |
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GIN = map(initial_part,G,VDV,MW,W); |
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/* GIN is a groebner basis w.r.t. a term order M */ |
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/* As -W+W=0, gr_(-W,W)(D<x,d>) = D<x,d> */ |
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/* find b(W1*x1*d1+...+WN*xN*dN) in Id(GIN) */ |
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for ( I = 0, T = 0; I < N1; I++ ) |
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T += W[I]*V1[I]*DV1[I]; |
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/* change of ordering from VDV to VDV2 */ |
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VDV2 = append(V2,DV2); |
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dp_set_weight(WtV2); |
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for ( Pind = 0; ; Pind++ ) { |
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Prime = lprime(Pind); |
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GIN2 = dp_weyl_gr_main(GIN,VDV2,0,-Prime,0); |
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if ( GIN2 ) break; |
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} |
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R = weyl_minipoly(GIN2,VDV2,0,T); /* M represents DRL order */ |
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dp_set_weight(0); |
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return subst(R,s,-s-1); |
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} |
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/* minimal polynomial of s; modular computation */ |
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def weyl_minipolym(G,V,O,M,V0) |
def weyl_minipolym(G,V,O,M,V0) |
{ |
{ |
N = length(V); |
N = length(V); |
Line 366 def weyl_minipolym(G,V,O,M,V0) |
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Line 604 def weyl_minipolym(G,V,O,M,V0) |
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GI = cons(I,GI); |
GI = cons(I,GI); |
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U = dp_mod(dp_ptod(V0,V),M,[]); |
U = dp_mod(dp_ptod(V0,V),M,[]); |
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U = dp_weyl_nf_mod(GI,U,PS,1,M); |
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T = dp_mod(<<0>>,M,[]); |
T = dp_mod(<<0>>,M,[]); |
TT = dp_mod(dp_ptod(1,V),M,[]); |
TT = dp_mod(dp_ptod(1,V),M,[]); |
Line 388 def weyl_minipolym(G,V,O,M,V0) |
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Line 627 def weyl_minipolym(G,V,O,M,V0) |
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} |
} |
} |
} |
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/* minimal polynomial of s over Q */ |
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def weyl_minipoly(G0,V0,O0,P) |
def weyl_minipoly(G0,V0,O0,P) |
{ |
{ |
HM = hmlist(G0,V0,O0); |
HM = hmlist(G0,V0,O0); |
Line 400 def weyl_minipoly(G0,V0,O0,P) |
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Line 641 def weyl_minipoly(G0,V0,O0,P) |
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PS[I] = dp_ptod(car(T),V0); |
PS[I] = dp_ptod(car(T),V0); |
for ( I = Len - 1, GI = []; I >= 0; I-- ) |
for ( I = Len - 1, GI = []; I >= 0; I-- ) |
GI = cons(I,GI); |
GI = cons(I,GI); |
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PSM = newvect(Len); |
DP = dp_ptod(P,V0); |
DP = dp_ptod(P,V0); |
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for ( I = 0; ; I++ ) { |
for ( Pind = 0; ; Pind++ ) { |
Prime = lprime(I); |
Prime = lprime(Pind); |
if ( !valid_modulus(HM,Prime) ) |
if ( !valid_modulus(HM,Prime) ) |
continue; |
continue; |
MP = weyl_minipolym(G0,V0,O0,Prime,P); |
setmod(Prime); |
D = deg(MP,var(MP)); |
for ( I = 0, T = G0, HL = []; T != []; T = cdr(T), I++ ) |
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PSM[I] = dp_mod(dp_ptod(car(T),V0),Prime,[]); |
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NFP = weyl_nf(GI,DP,1,PS); |
NFP = weyl_nf(GI,DP,1,PS); |
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NFPM = dp_mod(NFP[0],Prime,[])/ptomp(NFP[1],Prime); |
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NF = [[dp_ptod(1,V0),1]]; |
NF = [[dp_ptod(1,V0),1]]; |
LCM = 1; |
LCM = 1; |
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for ( J = 1; J <= D; J++ ) { |
TM = dp_mod(<<0>>,Prime,[]); |
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TTM = dp_mod(dp_ptod(1,V0),Prime,[]); |
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GM = NFM = [[TTM,TM]]; |
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for ( D = 1; ; D++ ) { |
if ( dp_gr_print() ) |
if ( dp_gr_print() ) |
print(".",2); |
print(".",2); |
NFPrev = car(NF); |
NFPrev = car(NF); |
Line 422 def weyl_minipoly(G0,V0,O0,P) |
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Line 671 def weyl_minipoly(G0,V0,O0,P) |
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NFJ = remove_cont(NFJ); |
NFJ = remove_cont(NFJ); |
NF = cons(NFJ,NF); |
NF = cons(NFJ,NF); |
LCM = ilcm(LCM,NFJ[1]); |
LCM = ilcm(LCM,NFJ[1]); |
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/* modular computation */ |
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TM = dp_mod(<<D>>,Prime,[]); |
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TTM = dp_mod(NFJ[0],Prime,[])/ptomp(NFJ[1],Prime); |
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NFM = cons([TTM,TM],NFM); |
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LM = dp_lnf_mod([TTM,TM],GM,Prime); |
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if ( !LM[0] ) |
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break; |
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else |
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GM = insert(GM,LM); |
} |
} |
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if ( dp_gr_print() ) |
if ( dp_gr_print() ) |
print(""); |
print(""); |
U = NF[0][0]*idiv(LCM,NF[0][1]); |
U = NF[0][0]*idiv(LCM,NF[0][1]); |
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return S; |
return S; |
} |
} |
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def member(A,L) { |
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for ( ; L != []; L = cdr(L) ) |
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if ( A == car(L) ) |
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return 1; |
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return 0; |
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} |
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def intersection(A,B) |
def intersection(A,B) |
{ |
{ |
for ( L = []; A != []; A = cdr(A) ) |
for ( L = []; A != []; A = cdr(A) ) |
Line 545 def v_factorial(V,N) |
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Line 798 def v_factorial(V,N) |
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{ |
{ |
for ( J = N-1, R = 1; J >= 0; J-- ) |
for ( J = N-1, R = 1; J >= 0; J-- ) |
R *= V-J; |
R *= V-J; |
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return R; |
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} |
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def w_tdeg(F,V,W) |
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{ |
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dp_set_weight(newvect(length(W),W)); |
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T = dp_ptod(F,V); |
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for ( R = 0; T; T = cdr(T) ) { |
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D = dp_td(T); |
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if ( D > R ) R = D; |
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} |
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return R; |
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} |
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def replace_vars_f(F) |
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{ |
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return subst(F,s,TMP_S,t,TMP_T,y1,TMP_Y1,y2,TMP_Y2); |
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} |
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def replace_vars_v(V) |
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{ |
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V = replace_var(V,s,TMP_S); |
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V = replace_var(V,t,TMP_T); |
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V = replace_var(V,y1,TMP_Y1); |
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V = replace_var(V,y2,TMP_Y2); |
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return V; |
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} |
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def replace_var(V,X,Y) |
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{ |
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V = reverse(V); |
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for ( R = []; V != []; V = cdr(V) ) { |
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Z = car(V); |
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if ( Z == X ) |
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R = cons(Y,R); |
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else |
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R = cons(Z,R); |
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} |
return R; |
return R; |
} |
} |
end$ |
end$ |