dtpttr man page on Scientific

```DTPTTR(1LAPACK routine (version 3.2)				     DTPTTR(1)

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

SYNOPSIS
SUBROUTINE DTPTTR( UPLO, N, AP, A, LDA, INFO )

CHARACTER	  UPLO

INTEGER	  INFO, N, LDA

DOUBLE	  PRECISION A( LDA, * ), AP( * )

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

ARGUMENTS
UPLO    (input) CHARACTER
= 'U':  A is upper triangular.
= 'L':  A is lower triangular.

N       (input) INTEGER
The order of the matrix A. N >= 0.

AP      (input) DOUBLE PRECISION array, dimension ( N*(N+1)/2 ),
On entry, the upper or lower triangular matrix A, packed colum‐
nwise 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       (output) 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     (input) INTEGER
The leading dimension of the array A.  LDA >= max(1,N).

INFO    (output) INTEGER
= 0:  successful exit
< 0:  if INFO = -i, the i-th argument had an illegal value

LAPACK routine (version 3.2)	 November 2008			     DTPTTR(1)
```
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