lapack_ldl_factor_f32

void lapack_ldl_factor_f32(const float * A, float * A_out, int * ipiv, int n, int * info)

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Single-precision symmetric indefinite LDL^T factorisation.

Bunch-Kaufman factorisation $A = L D L^T$ for a symmetric (possibly indefinite) matrix. The packed $L$ + $D$ output is written to A_out alongside pivot indices in ipiv.

Math

$A = L \, D \, L^T$

References

LAPACK ssytrf_.

Parameters

Aconst float*

Row-major

n \times n

symmetric input.

A_outfloat*

Packed factorisation (LAPACK ssytrf_ native layout, row-major).

ipivint*

Bunch-Kaufman pivot indices, length

n

nint

Side length.

infoint*

LAPACK status word.

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