lapack_lu_f32

void lapack_lu_f32(const float * A, int n, int * ipiv, float * L_out, float * U_out, int * info)

Single-precision LU decomposition split into separate L and U matrices.

Runs sgetrf_ and then explicitly extracts the unit-lower-triangular $L$ and upper-triangular $U$ from the packed LAPACK output.

Math

$P A = L U$ where $P$ is encoded by ipiv.

References

LAPACK sgetrf_.

Aconst float*

Row-major

n \times n

input.

nint

Side length.

ipivint*

Pivot indices written by sgetrf_ (1-based, length

n

L_outfloat*

Receives the unit-lower-triangular factor (row-major,

n \times n

U_outfloat*

Receives the upper-triangular factor (row-major,

n \times n

infoint*

LAPACK status word.

void lapack_lu_f32(const float * A, int n, int * ipiv, float * L_out, float * U_out, int * info)