mkl_?getrfnp

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 11/07/2023

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mkl_?getrfnp_compact

The routine computes the LU factorization, without pivoting, of a set of general, m x n matrices that have been stored in Compact format (see Compact Format).

Syntax

void mkl_sgetrfnp_compact (MKL_LAYOUT layout, MKL_INT m, MKL_INT n, float * ap, MKL_INT ldap, MKL_INT * info, MKL_COMPACT_PACK format, MKL_INT nm);

void mkl_dgetrfnp_compact (MKL_LAYOUT layout, MKL_INT m, MKL_INT n, double * ap, MKL_INT ldap, MKL_INT * info, MKL_COMPACT_PACK format, MKL_INT nm);

void mkl_cgetrfnp_compact (MKL_LAYOUT layout, MKL_INT m, MKL_INT n, float * ap, MKL_INT ldap, MKL_INT * info, MKL_COMPACT_PACK format, MKL_INT nm);

void mkl_zgetrfnp_compact (MKL_LAYOUT layout, MKL_INT m, MKL_INT n, double * ap, MKL_INT ldap, MKL_INT * info, MKL_COMPACT_PACK format, MKL_INT nm);

Description

The mkl_?getrfnp_compact routine calculates the LU factorizations of a set of nm general (m x n) matrices A, stored in Compact format, as A_c = L_c*U_c. The factorization (output) data will also be stored in Compact format.

NOTE:

Compact routines have some limitations; see Numerical Limitations.

Input Parameters

layout: Specifies whether two-dimensional array storage is row-major (MKL_ROW_MAJOR) or column-major (MKL_COL_MAJOR).
m: The number of rows of A; m ≥ 0.
n: The number of columns of A; n ≥ 0.
ap: Points to the beginning of the the array which stores nm A_c matrices.
See Compact Format for more details.
ldap: Leading dimension of A_c.
format: Specifies the format of the compact matrices. See Compact Format or mkl_get_format_compact for details.
nm: Total number of matrices stored in Compact format.

Application Notes:

Before calling this routine, mkl_?gepack_compact must be called. After calling this routine, mkl_?geunpack_compact should be called, unless another compact routine will be subsequently called for the Compact format matrices.

The approximate number of floating-point operations for real flavors is:

nm*(2/3)n³, if m = n,

nm*(1/3)n²(3m-n), if m > n,

nm*(1/3)m²(3n-m), if m < n.

The number of operations for complex flavors is four times greater. Directly after calling this routine, you can call the following:

mkl_?getrinp_compact, for computing the inverse of the nm input matrices in Compact format

Output Parameters

ap: On exit, A_c is overwritten by its factorization data. ap points to the beginning of nm L_c and U_c factors of A_c. The unit diagonal elements of L_c are not stored.
info: The parameter is not currently used in this routine. It is reserved for the future use.

Parent topic: Compact BLAS and LAPACK Functions

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