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patch mbasis of zero matrices #24

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Merged
gilvillard merged 1 commit into from
Dec 19, 2025
Merged

patch mbasis of zero matrices #24

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8 changes: 4 additions & 4 deletions flint-extras/src/nmod_mat_poly_extra/nmod_mat_poly_mbasis.c
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Original file line number Diff line number Diff line change
Expand Up @@ -125,12 +125,12 @@ _PROFILER_REGION_START
const slong n = matp->c;

// initialize output approximant basis with identity
// except when matp == 0: return appbas = x**order * identity
// except when matp == 0: return appbas = identity
if (nmod_mat_poly_is_zero(matp))
{
nmod_mat_poly_fit_length(appbas, order+1);
_nmod_mat_poly_set_length(appbas, order+1);
nmod_mat_one(appbas->coeffs + order);
nmod_mat_poly_fit_length(appbas, 1);
_nmod_mat_poly_set_length(appbas, 1);
nmod_mat_one(appbas->coeffs + 0);
_PROFILER_REGION_STOP(t_others)
_MBASIS_PROFILER_OUTPUT
return;
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