135 lines
3.4 KiB
Fortran
135 lines
3.4 KiB
Fortran
*> \brief \b SLAG2D converts a single precision matrix to a double precision 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 SLAG2D + dependencies
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*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/slag2d.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/slag2d.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/slag2d.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 SLAG2D( M, N, SA, LDSA, A, LDA, INFO )
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*
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* .. Scalar Arguments ..
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* INTEGER INFO, LDA, LDSA, M, 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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*> SLAG2D converts a SINGLE PRECISION matrix, SA, to a DOUBLE
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*> PRECISION matrix, A.
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*>
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*> Note that while it is possible to overflow while converting
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*> from double to single, it is not possible to overflow when
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*> converting from single to double.
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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] M
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*> \verbatim
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*> M is INTEGER
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*> The number of lines of the matrix A. M >= 0.
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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 columns of the matrix A. N >= 0.
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*> \endverbatim
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*>
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*> \param[in] SA
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*> \verbatim
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*> SA is REAL array, dimension (LDSA,N)
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*> On entry, the M-by-N coefficient matrix SA.
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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] A
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*> \verbatim
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*> A is DOUBLE PRECISION array, dimension (LDA,N)
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*> On exit, the M-by-N 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,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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*> \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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*> \ingroup OTHERauxiliary
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*
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* =====================================================================
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SUBROUTINE SLAG2D( M, N, SA, LDSA, A, LDA, INFO )
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*
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* -- LAPACK auxiliary routine --
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* -- LAPACK is a software package provided by Univ. of Tennessee, --
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* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
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*
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* .. Scalar Arguments ..
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INTEGER INFO, LDA, LDSA, M, 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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*
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* .. Local Scalars ..
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INTEGER I, J
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* ..
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* .. Executable Statements ..
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*
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INFO = 0
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DO 20 J = 1, N
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DO 10 I = 1, M
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A( I, J ) = SA( I, J )
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10 CONTINUE
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20 CONTINUE
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RETURN
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*
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* End of SLAG2D
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*
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END
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