?tfttp

Developer Reference for Intel® oneAPI Math Kernel Library for C

Download PDF

ID 766684

Date 10/15/2026

Version

Public

?tfttp

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

Syntax

lapack_int LAPACKE_stfttp(int matrix_layout, char transr, char uplo, lapack_int n,
                          const float *arf, float *ap);

lapack_int LAPACKE_dtfttp(int matrix_layout, char transr, char uplo, lapack_int n,
                          const double *arf, double *ap);

lapack_int LAPACKE_ctfttp(int matrix_layout, char transr, char uplo, lapack_int n,
                          const lapack_complex_float *arf, lapack_complex_float *ap);

lapack_int LAPACKE_ztfttp(int matrix_layout, char transr, char uplo, lapack_int n,
                          const lapack_complex_double *arf, lapack_complex_double *ap);

Include Files

mkl.h

Description

The routine copies a triangular matrix A from the Rectangular Full Packed (RFP) format to the standard packed 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 is in the Normal format, = ‘T’: arf is in the Transpose format (for stfttp and dtfttp ), = ‘C’: arf is in the Conjugate-transpose format (for ctfttp and ztfttp ).

uplo: CHARACTER*1 . Specifies whether A is upper or lower triangular: = ‘U’: A is upper triangular, = ‘L’: A is lower triangular.

n: Specifies the order of the matrix A . The value of n must be at least zero.

arf: REAL for stfttp , DOUBLE PRECISION for dtfttp , COMPLEX for ctfttp , DOUBLE COMPLEX for ztfttp . Array, size at least max (1, n *( n +1)/2). On entry, the upper or lower triangular matrix A stored in the RFP format.

Output Parameters

ap: REAL for stfttp , DOUBLE PRECISION for dtfttp , COMPLEX for ctfttp , DOUBLE COMPLEX for ztfttp . 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. The j -th column of A is stored in the array ap as follows: if uplo = ‘U’, ap(i + (j-1)*j/2) = A(i,j) for 1 ≤ i ≤ j , if uplo = ‘L’, ap(i + (j-1)*(2n-j)/2) = A(i,j) for j ≤ i ≤ n .

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.

Select Your Language

Using Intel.com Search

Quick Links

Recent Searches

Advanced Search

Only search in

Developer Reference for Intel® oneAPI Math Kernel Library for C

?tfttp

Syntax

Include Files

Description

Input Parameters

Output Parameters

Return Values