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

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

NAG Ltd.

Date:

June 2017

Definition at line 106 of file dtrttp.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

The man page dtrttp(3) is an alias of dtrttp.f(3).

Tue Nov 14 2017 Version 3.8.0 LAPACK