1 *> \brief \b STRTTP copies a triangular matrix from the standard full format (TR) to the standard packed format (TP).
3 * =========== DOCUMENTATION ===========
5 * Online html documentation available at
6 * http://www.netlib.org/lapack/explore-html/
9 *> Download STRTTP + dependencies
10 *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/strttp.f">
12 *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/strttp.f">
14 *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/strttp.f">
21 * SUBROUTINE STRTTP( UPLO, N, A, LDA, AP, INFO )
23 * .. Scalar Arguments ..
25 * INTEGER INFO, N, LDA
27 * .. Array Arguments ..
28 * REAL A( LDA, * ), AP( * )
37 *> STRTTP copies a triangular matrix A from full format (TR) to standard
38 *> packed format (TP).
46 *> UPLO is CHARACTER*1
47 *> = 'U': A is upper triangular.
48 *> = 'L': A is lower triangular.
54 *> The order of the matrices AP and A. N >= 0.
59 *> A is REAL array, dimension (LDA,N)
60 *> On exit, the triangular matrix A. If UPLO = 'U', the leading
61 *> N-by-N upper triangular part of A contains the upper
62 *> triangular part of the matrix A, and the strictly lower
63 *> triangular part of A is not referenced. If UPLO = 'L', the
64 *> leading N-by-N lower triangular part of A contains the lower
65 *> triangular part of the matrix A, and the strictly upper
66 *> triangular part of A is not referenced.
72 *> The leading dimension of the array A. LDA >= max(1,N).
77 *> AP is REAL array, dimension (N*(N+1)/2
78 *> On exit, the upper or lower triangular matrix A, packed
79 *> columnwise in a linear array. The j-th column of A is stored
80 *> in the array AP as follows:
81 *> if UPLO = 'U', AP(i + (j-1)*j/2) = A(i,j) for 1<=i<=j;
82 *> if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=n.
88 *> = 0: successful exit
89 *> < 0: if INFO = -i, the i-th argument had an illegal value
95 *> \author Univ. of Tennessee
96 *> \author Univ. of California Berkeley
97 *> \author Univ. of Colorado Denver
100 *> \date September 2012
102 *> \ingroup realOTHERcomputational
104 * =====================================================================
105 SUBROUTINE STRTTP( UPLO, N, A, LDA, AP, INFO )
107 * -- LAPACK computational routine (version 3.4.2) --
108 * -- LAPACK is a software package provided by Univ. of Tennessee, --
109 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
112 * .. Scalar Arguments ..
116 * .. Array Arguments ..
117 REAL A( LDA, * ), AP( * )
120 * =====================================================================
124 * .. Local Scalars ..
128 * .. External Functions ..
132 * .. External Subroutines ..
135 * .. Executable Statements ..
137 * Test the input parameters.
140 LOWER = LSAME( UPLO, 'L' )
141 IF( .NOT.LOWER .AND. .NOT.LSAME( UPLO, 'U' ) ) THEN
143 ELSE IF( N.LT.0 ) THEN
145 ELSE IF( LDA.LT.MAX( 1, N ) ) THEN
149 CALL XERBLA( 'STRTTP', -INFO )