?tfttp

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 10/15/2026

Version

Public

?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. Specifies the order of the matrix A. The value of n must be at least zero.

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.

Return Values

No return value, info is an Output Parameter.

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Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

?tfttp

Syntax

Include Files

Description

Input Parameters

Output Parameters

Return Values