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/*
Copyright (C) 2022 Fredrik Johansson
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 "gr.h"
#include "gr_mat.h"
int
gr_mat_randrank(gr_mat_t mat, flint_rand_t state,
slong rank, gr_ctx_t ctx)
{
slong i;
gr_ptr diag;
int status = GR_SUCCESS;
int parity;
if (rank < 0 || rank > mat->r || rank > mat->c)
return GR_DOMAIN;
GR_TMP_INIT_VEC(diag, rank, ctx);
for (i = 0; i < rank; i++)
status |= gr_randtest_not_zero(GR_ENTRY(diag, i, ctx->sizeof_elem), state, ctx);
status |= gr_mat_randpermdiag(&parity, mat, state, diag, rank, ctx);
GR_TMP_CLEAR_VEC(diag, rank, ctx);
return status;
}