strttp.f −

**Functions/Subroutines**

subroutine **strttp** (UPLO, N, A, LDA, AP, INFO)

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

* subroutine strttp (characterUPLO, integerN, real, dimension( lda, * )A, integerLDA, real, dimension( * )AP, integerINFO)* copies a triangular matrix from the standard full format (TR) to the standard packed format (TP).

STRTTP

**Purpose:**

STRTTP 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 REAL 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 REAL 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 strttp.f.

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