C++ (Cpp) nmod_poly_reverse Examples

Example #1

File: nmod_poly_mat_right_tmul.c Project: defeo/ff_compositum

void nmod_poly_mat_right_tmul(nmod_poly_mat_t C, const nmod_poly_mat_t L, const nmod_poly_mat_t Bin, long m, long k){
  long qq = nmod_poly_mat_nrows(Bin);
  long rr = nmod_poly_mat_ncols(Bin);
  long pp = nmod_poly_mat_nrows(L);

  nmod_poly_mat_t B;
  nmod_poly_mat_init(B, rr, qq, nmod_poly_mat_modulus(Bin));

  long i, j;

  for (i = 0; i < rr; i++)
    for (j = 0; j < qq; j++)
      nmod_poly_reverse(nmod_poly_mat_entry(B, i, j), nmod_poly_mat_entry(Bin, j, i), m+1);

  nmod_poly_mat_mul(C, L, B);

  for (i = 0; i < pp; i++)
    for (j = 0; j < qq; j++){
      nmod_poly_truncate(nmod_poly_mat_entry(C, i, j), k+m);
      nmod_poly_shift_right(nmod_poly_mat_entry(C, i, j), nmod_poly_mat_entry(C, i, j), m);
    }
	
  nmod_poly_mat_clear(B);
}

Example #2

File: flint-lmulmodprecon.c Project: tell/ntl-unix

int main()
{
   setbuf(stdout, NULL);

   for (long l = 5; l <= 60; l += 5) {
      // for (long n = 1024; n <= 65536; n *= 2) {
      for (long idx = 0; idx < 13; idx ++) {
         long n  = 1024*(1L << idx/2);
         if (idx & 1) n += n/2;
           SetSeed((ZZ(l) << 64) + ZZ(n));

	   long p;

	   RandomLen(p, l);
           if (p % 2 == 0) p++;
	   zz_p::init(p);


	   zz_pX a, b, c, f;

	   random(a, n);
	   random(b, n);
           random(f, n);
           SetCoeff(f, n);

           zz_pXModulus F(f);
           zz_pXMultiplier B(b, F);

	   double t;

	   MulMod(c, a, B, F);

	   long iter = 1;
	   do {
	      t = GetTime();
	      for (long i = 0; i < iter; i++) MulMod(c, a, B, F);
	      t = GetTime() - t;
	      iter *= 2;
	   } while (t < 3);
	   iter /= 2;

	   t = GetTime();
	   for (long i = 0; i < iter; i++) MulMod(c, a, B, F);
	   t = GetTime()-t;
	   double NTLTime = t;



         Flintzz_pX f_a(a), f_b(b), f_c, f_f(f), f_finv;
         nmod_poly_reverse(f_finv.value, f_f.value, f_f.value->length);
         nmod_poly_inv_series_newton(f_finv.value, f_finv.value, f_f.value->length);

         nmod_poly_mulmod_preinv(f_c.value, f_a.value, f_b.value, f_f.value, f_finv.value);


         t = GetTime();
         for (long i = 0; i < iter; i++)
            nmod_poly_mulmod_preinv(f_c.value, f_a.value, f_b.value, f_f.value, f_finv.value);
         t = GetTime()-t;
         double FlintTime = t;


         printf("%8.2f", FlintTime/NTLTime);
      }

      printf("\n");
   }
}