--- rpl/lapack/lapack/dlat2s.f 2010/08/13 21:03:53 1.3 +++ rpl/lapack/lapack/dlat2s.f 2012/12/14 14:22:36 1.10 @@ -1,9 +1,120 @@ +*> \brief \b DLAT2S converts a double-precision triangular matrix to a single-precision triangular matrix. +* +* =========== DOCUMENTATION =========== +* +* Online html documentation available at +* http://www.netlib.org/lapack/explore-html/ +* +*> \htmlonly +*> Download DLAT2S + dependencies +*> +*> [TGZ] +*> +*> [ZIP] +*> +*> [TXT] +*> \endhtmlonly +* +* Definition: +* =========== +* +* SUBROUTINE DLAT2S( UPLO, N, A, LDA, SA, LDSA, INFO ) +* +* .. Scalar Arguments .. +* CHARACTER UPLO +* INTEGER INFO, LDA, LDSA, N +* .. +* .. Array Arguments .. +* REAL SA( LDSA, * ) +* DOUBLE PRECISION A( LDA, * ) +* .. +* +* +*> \par Purpose: +* ============= +*> +*> \verbatim +*> +*> DLAT2S converts a DOUBLE PRECISION triangular matrix, SA, to a SINGLE +*> PRECISION triangular matrix, A. +*> +*> RMAX is the overflow for the SINGLE PRECISION arithmetic +*> DLAS2S checks that all the entries of A are between -RMAX and +*> RMAX. If not the convertion is aborted and a flag is raised. +*> +*> This is an auxiliary routine so there is no argument checking. +*> \endverbatim +* +* Arguments: +* ========== +* +*> \param[in] UPLO +*> \verbatim +*> UPLO is CHARACTER*1 +*> = 'U': A is upper triangular; +*> = 'L': A is lower triangular. +*> \endverbatim +*> +*> \param[in] N +*> \verbatim +*> N is INTEGER +*> The number of rows and columns of the matrix A. N >= 0. +*> \endverbatim +*> +*> \param[in] A +*> \verbatim +*> A is DOUBLE PRECISION array, dimension (LDA,N) +*> On entry, the N-by-N triangular coefficient matrix A. +*> \endverbatim +*> +*> \param[in] LDA +*> \verbatim +*> LDA is INTEGER +*> The leading dimension of the array A. LDA >= max(1,N). +*> \endverbatim +*> +*> \param[out] SA +*> \verbatim +*> SA is REAL array, dimension (LDSA,N) +*> Only the UPLO part of SA is referenced. On exit, if INFO=0, +*> the N-by-N coefficient matrix SA; if INFO>0, the content of +*> the UPLO part of SA is unspecified. +*> \endverbatim +*> +*> \param[in] LDSA +*> \verbatim +*> LDSA is INTEGER +*> The leading dimension of the array SA. LDSA >= max(1,M). +*> \endverbatim +*> +*> \param[out] INFO +*> \verbatim +*> INFO is INTEGER +*> = 0: successful exit. +*> = 1: an entry of the matrix A is greater than the SINGLE +*> PRECISION overflow threshold, in this case, the content +*> of the UPLO part of SA in exit is unspecified. +*> \endverbatim +* +* Authors: +* ======== +* +*> \author Univ. of Tennessee +*> \author Univ. of California Berkeley +*> \author Univ. of Colorado Denver +*> \author NAG Ltd. +* +*> \date September 2012 +* +*> \ingroup doubleOTHERauxiliary +* +* ===================================================================== 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, -- * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- -* May 2007 +* September 2012 * * .. Scalar Arguments .. CHARACTER UPLO @@ -14,49 +125,7 @@ DOUBLE PRECISION A( LDA, * ) * .. * -* Purpose -* ======= -* -* DLAT2S converts a DOUBLE PRECISION triangular matrix, SA, to a SINGLE -* PRECISION triangular matrix, A. -* -* RMAX is the overflow for the SINGLE PRECISION arithmetic -* DLAS2S checks that all the entries of A are between -RMAX and -* RMAX. If not the convertion is aborted and a flag is raised. -* -* This is an auxiliary routine so there is no argument checking. -* -* Arguments -* ========= -* -* UPLO (input) CHARACTER*1 -* = 'U': A is upper triangular; -* = 'L': A is lower triangular. -* -* N (input) INTEGER -* The number of rows and columns of the matrix A. N >= 0. -* -* A (input) DOUBLE PRECISION array, dimension (LDA,N) -* On entry, the N-by-N triangular coefficient matrix A. -* -* LDA (input) INTEGER -* The leading dimension of the array A. LDA >= max(1,N). -* -* SA (output) REAL array, dimension (LDSA,N) -* Only the UPLO part of SA is referenced. On exit, if INFO=0, -* the N-by-N coefficient matrix SA; if INFO>0, the content of -* the UPLO part of SA is unspecified. -* -* LDSA (input) INTEGER -* The leading dimension of the array SA. LDSA >= max(1,M). -* -* INFO (output) INTEGER -* = 0: successful exit. -* = 1: an entry of the matrix A is greater than the SINGLE -* PRECISION overflow threshold, in this case, the content -* of the UPLO part of SA in exit is unspecified. -* -* ========= +* ===================================================================== * * .. Local Scalars .. INTEGER I, J @@ -76,7 +145,7 @@ DO 20 J = 1, N DO 10 I = 1, J IF( ( A( I, J ).LT.-RMAX ) .OR. ( A( I, J ).GT.RMAX ) ) - + THEN + $ THEN INFO = 1 GO TO 50 END IF @@ -87,7 +156,7 @@ DO 40 J = 1, N DO 30 I = J, N IF( ( A( I, J ).LT.-RMAX ) .OR. ( A( I, J ).GT.RMAX ) ) - + THEN + $ THEN INFO = 1 GO TO 50 END IF