version 1.1, 2010/08/07 13:21:05
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version 1.11, 2014/01/27 09:28:23
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*> \brief \b DLAT2S converts a double-precision triangular matrix to a single-precision triangular matrix. |
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* |
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* =========== DOCUMENTATION =========== |
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* |
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* Online html documentation available at |
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* http://www.netlib.org/lapack/explore-html/ |
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* |
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*> \htmlonly |
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*> Download DLAT2S + dependencies |
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*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlat2s.f"> |
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*> [TGZ]</a> |
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*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlat2s.f"> |
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*> [ZIP]</a> |
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*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlat2s.f"> |
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*> [TXT]</a> |
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*> \endhtmlonly |
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* |
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* Definition: |
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* =========== |
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* |
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* SUBROUTINE DLAT2S( UPLO, N, A, LDA, SA, LDSA, INFO ) |
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* |
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* .. Scalar Arguments .. |
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* CHARACTER UPLO |
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* INTEGER INFO, LDA, LDSA, N |
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* .. |
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* .. Array Arguments .. |
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* REAL SA( LDSA, * ) |
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* DOUBLE PRECISION A( LDA, * ) |
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* .. |
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* |
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* |
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*> \par Purpose: |
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* ============= |
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*> |
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*> \verbatim |
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*> |
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*> DLAT2S converts a DOUBLE PRECISION triangular matrix, SA, to a SINGLE |
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*> PRECISION triangular matrix, A. |
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*> |
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*> RMAX is the overflow for the SINGLE PRECISION arithmetic |
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*> DLAS2S checks that all the entries of A are between -RMAX and |
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*> RMAX. If not the convertion is aborted and a flag is raised. |
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*> |
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*> This is an auxiliary routine so there is no argument checking. |
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*> \endverbatim |
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* |
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* Arguments: |
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* ========== |
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* |
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*> \param[in] UPLO |
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*> \verbatim |
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*> UPLO is CHARACTER*1 |
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*> = 'U': A is upper triangular; |
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*> = 'L': A is lower triangular. |
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*> \endverbatim |
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*> |
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*> \param[in] N |
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*> \verbatim |
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*> N is INTEGER |
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*> The number of rows and columns of the matrix A. N >= 0. |
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*> \endverbatim |
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*> |
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*> \param[in] A |
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*> \verbatim |
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*> A is DOUBLE PRECISION array, dimension (LDA,N) |
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*> On entry, the N-by-N triangular coefficient matrix A. |
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*> \endverbatim |
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*> |
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*> \param[in] LDA |
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*> \verbatim |
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*> LDA is INTEGER |
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*> The leading dimension of the array A. LDA >= max(1,N). |
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*> \endverbatim |
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*> |
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*> \param[out] SA |
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*> \verbatim |
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*> SA is REAL array, dimension (LDSA,N) |
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*> Only the UPLO part of SA is referenced. On exit, if INFO=0, |
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*> the N-by-N coefficient matrix SA; if INFO>0, the content of |
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*> the UPLO part of SA is unspecified. |
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*> \endverbatim |
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*> |
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*> \param[in] LDSA |
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*> \verbatim |
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*> LDSA is INTEGER |
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*> The leading dimension of the array SA. LDSA >= max(1,M). |
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*> \endverbatim |
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*> |
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*> \param[out] INFO |
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*> \verbatim |
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*> INFO is INTEGER |
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*> = 0: successful exit. |
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*> = 1: an entry of the matrix A is greater than the SINGLE |
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*> PRECISION overflow threshold, in this case, the content |
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*> of the UPLO part of SA in exit is unspecified. |
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*> \endverbatim |
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* |
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* Authors: |
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* ======== |
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* |
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*> \author Univ. of Tennessee |
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*> \author Univ. of California Berkeley |
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*> \author Univ. of Colorado Denver |
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*> \author NAG Ltd. |
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* |
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*> \date September 2012 |
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* |
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*> \ingroup doubleOTHERauxiliary |
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* |
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* ===================================================================== |
SUBROUTINE DLAT2S( UPLO, N, A, LDA, SA, LDSA, INFO ) |
SUBROUTINE DLAT2S( UPLO, N, A, LDA, SA, LDSA, INFO ) |
* |
* |
* -- LAPACK PROTOTYPE auxiliary routine (version 3.1.2) -- |
* -- LAPACK auxiliary routine (version 3.4.2) -- |
* -- LAPACK is a software package provided by Univ. of Tennessee, -- |
* -- LAPACK is a software package provided by Univ. of Tennessee, -- |
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- |
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- |
* May 2007 |
* September 2012 |
* |
* |
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
CHARACTER UPLO |
CHARACTER UPLO |
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DOUBLE PRECISION A( LDA, * ) |
DOUBLE PRECISION A( LDA, * ) |
* .. |
* .. |
* |
* |
* Purpose |
* ===================================================================== |
* ======= |
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* |
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* DLAT2S converts a DOUBLE PRECISION triangular matrix, SA, to a SINGLE |
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* PRECISION triangular matrix, A. |
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* |
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* RMAX is the overflow for the SINGLE PRECISION arithmetic |
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* DLAS2S checks that all the entries of A are between -RMAX and |
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* RMAX. If not the convertion is aborted and a flag is raised. |
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* |
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* This is an auxiliary routine so there is no argument checking. |
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* |
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* Arguments |
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* ========= |
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* |
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* UPLO (input) CHARACTER*1 |
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* = 'U': A is upper triangular; |
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* = 'L': A is lower triangular. |
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* |
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* N (input) INTEGER |
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* The number of rows and columns of the matrix A. N >= 0. |
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* |
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* A (input) DOUBLE PRECISION array, dimension (LDA,N) |
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* On entry, the N-by-N triangular coefficient matrix A. |
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* |
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* LDA (input) INTEGER |
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* The leading dimension of the array A. LDA >= max(1,N). |
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* |
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* SA (output) REAL array, dimension (LDSA,N) |
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* Only the UPLO part of SA is referenced. On exit, if INFO=0, |
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* the N-by-N coefficient matrix SA; if INFO>0, the content of |
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* the UPLO part of SA is unspecified. |
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* |
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* LDSA (input) INTEGER |
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* The leading dimension of the array SA. LDSA >= max(1,M). |
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* |
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* INFO (output) INTEGER |
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* = 0: successful exit. |
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* = 1: an entry of the matrix A is greater than the SINGLE |
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* PRECISION overflow threshold, in this case, the content |
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* of the UPLO part of SA in exit is unspecified. |
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* |
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* ========= |
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* |
* |
* .. Local Scalars .. |
* .. Local Scalars .. |
INTEGER I, J |
INTEGER I, J |
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DO 20 J = 1, N |
DO 20 J = 1, N |
DO 10 I = 1, J |
DO 10 I = 1, J |
IF( ( A( I, J ).LT.-RMAX ) .OR. ( A( I, J ).GT.RMAX ) ) |
IF( ( A( I, J ).LT.-RMAX ) .OR. ( A( I, J ).GT.RMAX ) ) |
+ THEN |
$ THEN |
INFO = 1 |
INFO = 1 |
GO TO 50 |
GO TO 50 |
END IF |
END IF |
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DO 40 J = 1, N |
DO 40 J = 1, N |
DO 30 I = J, N |
DO 30 I = J, N |
IF( ( A( I, J ).LT.-RMAX ) .OR. ( A( I, J ).GT.RMAX ) ) |
IF( ( A( I, J ).LT.-RMAX ) .OR. ( A( I, J ).GT.RMAX ) ) |
+ THEN |
$ THEN |
INFO = 1 |
INFO = 1 |
GO TO 50 |
GO TO 50 |
END IF |
END IF |