# stpttr.f (3) - Linux Man Pages

stpttr.f -

## SYNOPSIS

### Functions/Subroutines

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

## Function/Subroutine Documentation

### subroutine stpttr (characterUPLO, integerN, real, dimension( * )AP, real, dimension( lda, * )A, integerLDA, integerINFO)

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

Purpose:

``` STPTTR 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 REAL 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 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).
```

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