?trttp

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 12/16/2022

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?trttp

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

Syntax

call strttp( uplo, n, a, lda, ap, info )

call dtrttp( uplo, n, a, lda, ap, info )

call ctrttp( uplo, n, a, lda, ap, info )

call ztrttp( uplo, n, a, lda, ap, info )

Include Files

mkl.fi

Description

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

Input Parameters

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.

a

REAL for strttp,

DOUBLE PRECISION for dtrttp,

COMPLEX for ctrttp,

DOUBLE COMPLEX for ztrttp.

Array, size (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

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

Output Parameters

ap

REAL for strttp,

DOUBLE PRECISION for dtrttp,

COMPLEX for ctrttp,

DOUBLE COMPLEX for ztrttp.

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

?trttp