?larcm

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 10/15/2026

Version

Public

?larcm

Multiplies a square real matrix by a complex matrix.

Syntax

lapack_int LAPACKE_clarcm(int matrix_layout, lapack_int m, lapack_int n, const float *a,
                          lapack_int lda, const lapack_complex_float *b, lapack_int ldb,
                          lapack_complex_float *c, lapack_int ldc);

lapack_int LAPACKE_zlarcm(int matrix_layout, lapack_int m, lapack_int n, const double *a,
                          lapack_int lda, const lapack_complex_double *b, lapack_int ldb,
                          lapack_complex_double *c, lapack_int ldc);

Description

The routine performs a simple matrix-matrix multiplication of the form

C = A*B ,

where A is m -by- m and real, B is m -by- n and complex, and C is m -by- n and complex.

Input Parameters

m: The number of rows in the matrix A. The value of m must be at least zero.

n

The number of columns of matrix B and the number of columns of matrix C

( n≥ 0 ).

a: REAL for clarcm DOUBLE PRECISION for zlarcm Array, size (lda, m) . Contains the m -by- m matrix A . Array, size [lda* m] . Contains the m -by- m matrix A .

lda

The leading dimension of the array a , lda≥max(1, m) .

b

COMPLEX for clarcm DOUBLE COMPLEX for zlarcm

Array, DIMENSION size (ldb, n) . Contains the m -by- n matrix B .

ldb

The leading dimension of the array b , ldb ≥ max (1, m ) for column-major layout; ldb ≥ max (1, n ) for row-major layout .

ldc

The leading dimension of the array c , ldc ≥ max (1, m ) for column-major layout; ldc ≥ max (1, n ) for row-major layout .

rwork: REAL for clarcm DOUBLE PRECISION for zlarcm Workspace array, DIMENSION (2*m*n) .

Output Parameters

c: COMPLEX for clarcm DOUBLE COMPLEX for zlarcm Array, size ( ldc , n ). Contains the m -by- n matrix C .

Return Values

This function returns a value info . If info = 0, the execution is successful. If info = - i , parameter i had an illegal value.

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Developer Reference for Intel® oneAPI Math Kernel Library for C

?larcm

Syntax

Description

Input Parameters

Output Parameters

Return Values