dtrttp.f man page

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

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

dtrttp(3) is an alias of dtrttp.f(3).

Sat Nov 16 2013 Version 3.4.2 LAPACK