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dtrttp.f(3) LAPACK dtrttp.f(3)

NAME

dtrttp.f -

SYNOPSIS

Functions/Subroutines


subroutine dtrttp (UPLO, N, A, LDA, AP, INFO)
DTRTTP copies a triangular matrix from the standard full format (TR) to the standard packed format (TP).

Function/Subroutine Documentation

subroutine dtrttp (characterUPLO, integerN, double precision, dimension( lda, * )A, integerLDA, double precision, dimension( * )AP, integerINFO)

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

Purpose:


DTRTTP copies a triangular matrix A from full format (TR) to standard
packed format (TP).

Parameters:

UPLO


UPLO is CHARACTER*1
= 'U': A is upper triangular.
= 'L': A is lower triangular.

N


N is INTEGER
The order of the matrices AP and A. N >= 0.

A


A is DOUBLE PRECISION array, dimension (LDA,N)
On exit, the triangular matrix A. If UPLO = 'U', the leading
N-by-N upper triangular part of 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 A contains the lower
triangular part of the matrix A, and the strictly upper
triangular part of A is not referenced.

LDA


LDA is INTEGER
The leading dimension of the array A. LDA >= max(1,N).

AP


AP is DOUBLE PRECISION array, dimension (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


INFO is INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

September 2012

Definition at line 105 of file dtrttp.f.

Author

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Tue Sep 25 2012 Version 3.4.2