?tfttp

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 12/16/2022

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?tfttp

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

Syntax

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

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

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

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

Include Files

mkl.fi

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

transr

CHARACTER*1.

= '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

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

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.

info

INTEGER. 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 Fortran

?tfttp