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IPDMV.c
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IPDMV.c
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/*======================================================================
B <- IPDMV(r,A)
Integral polynomial derivative, main variable.
Inputs
r : BETA-digit, r >= 1, the number of variables.
A : in Z[X1,...,Xr].
Outputs
B : in Z[X1,...,Xr], the derivative of A with
respect to its main variable.
======================================================================*/
#include "saclib.h"
Word IPDMV(r,A)
Word r,A;
{
Word Ap,B,a,b,e,ep,rp;
/* hide a,ep,rp; */
Step1: /* A=0. */
if (A == 0)
{
B = 0;
goto Return;
}
Step2: /* General case. */
Ap = A;
rp = r - 1;
B = NIL;
do
{
ADV2(Ap,&e,&a,&Ap);
if (rp == 0)
b = IPROD(e,a);
else
b = IPIP(rp,e,a);
ep = e - 1;
if (e != 0)
B = COMP2(b,ep,B);
}
while (!(Ap == NIL));
B = INV(B);
if (B == NIL)
B = 0;
Return: /* Prepare for return. */
return(B);
}