?tpttr

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

Download PDF

ID 766686

Date 10/15/2026

Version

Public

?tpttr

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

Syntax

call stpttr(uplo, n, ap, a, lda, info)
call dtpttr(uplo, n, ap, a, lda, info)
call ctpttr(uplo, n, ap, a, lda, info)
call ztpttr(uplo, n, ap, a, lda, info)

Include Files

mkl.fi

Description

The routine copies a triangular matrix A from the standard packed format to the standard full 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 matrices ap and a . n≥ 0 .

ap: REAL for stpttr , DOUBLE PRECISION for dtpttr , COMPLEX for ctpttr , DOUBLE COMPLEX for ztpttr . Array, size at least max (1, n *( n +1)/2). (see Matrix Storage Schemes ). 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 .

lda

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

Output Parameters

a

REAL for stpttr , DOUBLE PRECISION for dtpttr , COMPLEX for ctpttr , DOUBLE COMPLEX for ztpttr .

Array, size ( lda, *) .

On exit, the triangular matrix A . If uplo = ‘U’, the leading n -by- n upper triangular part of the array a contains the upper triangular part of the matrix A , 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 part of the matrix A , and the strictly upper triangular part of a is not referenced.

info

INTEGER .

If info = 0 , the execution is successful.
If info = -i , the i -th parameter had an illegal value.
If info = -1011 , memory allocation error occurred.

Return Values

No return value, info is an Output Parameter.

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 Fortran

?tpttr

Syntax

Include Files

Description

Input Parameters

Output Parameters

Return Values