?tpttf

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 3/31/2023

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?tpttf

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

Syntax

call stpttf( transr, uplo, n, ap, arf, info )

call dtpttf( transr, uplo, n, ap, arf, info )

call ctpttf( transr, uplo, n, ap, arf, info )

call ztpttf( transr, uplo, n, ap, arf, info )

Include Files

mkl.fi

Description

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

Input Parameters

transr

CHARACTER*1.

= 'N': arf must be in the Normal format,

= 'T': arf must be in the Transpose format (for stpttf and dtpttf),

= 'C': arf must be in the Conjugate-transpose format (for ctpttf and ztpttf).

uplo

CHARACTER*1.

Specifies whether A is upper or lower triangular:

= 'U': A is upper triangular,

= 'L': A is lower triangular.

n

INTEGER. The order of the matrix A. n≥ 0.

ap

REAL for stpttf,

DOUBLE PRECISION for dtpttf,

COMPLEX for ctpttf,

DOUBLE COMPLEX for ztpttf.

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

On entry, 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.

Output Parameters

arf

REAL for stpttf,

DOUBLE PRECISION for dtpttf,

COMPLEX for ctfttp,

DOUBLE COMPLEX for ztpttf.

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

On exit, the upper or lower triangular matrix A stored in the RFP format.

info

INTEGER.

=0: successful exit,

< 0: if info = -i, 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 Fortran

?tpttf