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/*
Copyright (C) 2023 Vincent Neiger
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 "nmod_vec.h"
#include "nmod_poly.h"
#include "nmod_poly_mat.h"
void nmod_poly_mat_set_trunc(nmod_poly_mat_t res, const nmod_poly_mat_t pmat, long len)
{
nmod_poly_struct * res_ij;
nmod_poly_struct * pmat_ij;
if (pmat == res)
{
for (slong i = 0; i < pmat->r; i++)
{
for (slong j = 0; j < pmat->c; j++)
{
res_ij = nmod_poly_mat_entry(res, i, j);
if (res_ij->length > len)
{
res_ij->length = len;
_nmod_poly_normalise(res_ij);
}
}
}
}
else
{
slong rlen;
for (slong i = 0; i < pmat->r; i++)
{
for (slong j = 0; j < pmat->c; j++)
{
res_ij = nmod_poly_mat_entry(res, i, j);
pmat_ij = nmod_poly_mat_entry(pmat, i, j);
rlen = FLINT_MIN(len, pmat_ij->length);
while (rlen > 0 && pmat_ij->coeffs[rlen - 1] == 0)
rlen--;
nmod_poly_fit_length(res_ij, rlen);
_nmod_vec_set(res_ij->coeffs, pmat_ij->coeffs, rlen);
_nmod_poly_set_length(res_ij, rlen);
}
}
}
}