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dtpttr.f(3) LAPACK dtpttr.f(3)

NAME

dtpttr.f

SYNOPSIS

Functions/Subroutines


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

Function/Subroutine Documentation

subroutine dtpttr (character UPLO, integer N, double precision, dimension( * ) AP, double precision, dimension( lda, * ) A, integer LDA, integer INFO)

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

Purpose:


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

Parameters:

UPLO


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

N


N is INTEGER
The order of the matrix A. N >= 0.

AP


AP is DOUBLE PRECISION array, dimension ( N*(N+1)/2 ),
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.

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).

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:

December 2016

Definition at line 106 of file dtpttr.f.

Author

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Tue Nov 14 2017 Version 3.8.0