?trttp

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 4/28/2026

Version

Public

?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

strttp dtrttp ctrttp ztrttp

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 . On exit, the upper or lower triangular matrix A , packed columnwise in a linear array. (see Matrix Storage Schemes )

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.

Return Values

No return value, info is an Output Parameter.

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Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

?trttp

Syntax

Include Files

Description

Input Parameters

Output Parameters

Return Values