?trttp

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 7/13/2023

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?trttp

Copies a triangular matrix from the standard full format (TR) to the standard packed format (TP) .

Syntax

lapack_int LAPACKE_strttp (int matrix_layout , char uplo , lapack_int n , const float * a , lapack_int lda , float * ap );

lapack_int LAPACKE_dtrttp (int matrix_layout , char uplo , lapack_int n , const double * a , lapack_int lda , double * ap );

lapack_int LAPACKE_ctrttp (int matrix_layout , char uplo , lapack_int n , const lapack_complex_float * a , lapack_int lda , lapack_complex_float * ap );

lapack_int LAPACKE_ztrttp (int matrix_layout , char uplo , lapack_int n , const lapack_complex_double * a , lapack_int lda , lapack_complex_double * ap );

Include Files

mkl.h

Description

The routine copies a triangular matrix A from the standard full format to the standard packed format.

Input Parameters

uplo

Specifies whether A is upper or lower triangular:

= 'U': A is upper triangular,

= 'L': A is lower triangular.

n

The order of the matrix A, n≥ 0.

a

Array, size max(1, lda *n).

On entry, the triangular matrix A. If uplo = 'U', the leading n-by-n upper triangular part of the array a contains the upper triangular matrix, and the strictly lower triangular part of a is not referenced. If uplo = 'L', the leading n-by-n lower triangular part of the array a contains the lower triangular matrix, and the strictly upper triangular part of a is not referenced.

lda

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

Output Parameters

ap

Array, size at least max (1, n*(n+1)/2).

On exit, the upper or lower triangular matrix A, packed columnwise in a linear array. (see Matrix Storage Schemes)

Return Values

This function returns a value info.

If info = 0, the execution is successful.

If info < 0, the i-th parameter had an illegal value.

If info = -1011, memory allocation error occurred.

Parent topic: LAPACK Auxiliary Routines

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Developer Reference for Intel® oneAPI Math Kernel Library for C

?trttp

Syntax

Include Files

Description

Input Parameters

Output Parameters

Return Values