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/*
Copyright (C) 2020 Daniel Schultz
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "fmpz_mat.h"
#include "mpoly.h"
#include "fq_nmod_mpoly.h"
/* evaluate B(x_1,...,x_n) at x_i = y_c[i], y_j are vars of ctxAC */
void fq_nmod_mpoly_compose_fq_nmod_mpoly_gen(fq_nmod_mpoly_t A,
const fq_nmod_mpoly_t B, const slong * c,
const fq_nmod_mpoly_ctx_t ctxB, const fq_nmod_mpoly_ctx_t ctxAC)
{
fmpz_mat_t M;
if (B->length == 0)
{
fq_nmod_mpoly_zero(A, ctxAC);
return;
}
fmpz_mat_init(M, ctxAC->minfo->nfields + 1, ctxB->minfo->nfields);
mpoly_compose_mat_gen(M, c, ctxB->minfo, ctxAC->minfo);
if (A == B)
{
fq_nmod_mpoly_t T;
fq_nmod_mpoly_init(T, ctxAC);
_fq_nmod_mpoly_compose_mat(T, B, M, ctxB, ctxAC);
fq_nmod_mpoly_swap(A, T, ctxAC);
fq_nmod_mpoly_clear(T, ctxAC);
}
else
{
_fq_nmod_mpoly_compose_mat(A, B, M, ctxB, ctxAC);
}
fmpz_mat_clear(M);
return;
}