?trttf

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 4/28/2026

Version

Public

?trttf

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

Syntax

lapack_intLAPACKE_strttf ( intmatrix_layout , chartransr , charuplo , lapack_intn , constfloat*a , lapack_intlda , float*arf );

lapack_intLAPACKE_dtrttf ( intmatrix_layout , chartransr , charuplo , lapack_intn , constdouble*a , lapack_intlda , double*arf );

lapack_intLAPACKE_ctrttf ( intmatrix_layout , chartransr , charuplo , lapack_intn , constlapack_complex_float*a , lapack_intlda , lapack_complex_float*arf );

lapack_intLAPACKE_ztrttf ( intmatrix_layout , chartransr , charuplo , lapack_intn , constlapack_complex_double*a , lapack_intlda , lapack_complex_double*arf );

Include Files

mkl.h

Description

strttf dtrttf ctrttf ztrttf

The routine copies a triangular matrix A from the standard full format to the Rectangular Full Packed (RFP) format. For the description of the RFP format, see Matrix Storage Schemes .

Input Parameters

matrix_layout: Specifies whether matrix storage layout is row major ( LAPACK_ROW_MAJOR ) or column major ( LAPACK_COL_MAJOR ).

transr

= ‘N’: arf must be in the Normal format, = ‘T’: arf must be in the Transpose format (for strttf and dtrttf ), = ‘C’: arf must be in the Conjugate-transpose format (for ctrttf and ztrttf ).

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

REAL for strttf , DOUBLE PRECISION for dtrttf , COMPLEX for ctrttf , DOUBLE COMPLEX for ztrttf .

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

arf: REAL for strttf , DOUBLE PRECISION for dtrttf , COMPLEX for ctrttf , DOUBLE COMPLEX for ztrttf . Array, size at least max (1, n *( n +1)/2).

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.

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Developer Reference for Intel® oneAPI Math Kernel Library for C

?trttf

Syntax

Include Files

Description

Input Parameters

Output Parameters

Return Values