version 1.5, 2010/08/07 13:22:38
|
version 1.19, 2023/08/07 08:39:29
|
Line 1
|
Line 1
|
|
*> \brief \b ZLAG2C converts a complex double precision matrix to a complex single precision matrix. |
|
* |
|
* =========== DOCUMENTATION =========== |
|
* |
|
* Online html documentation available at |
|
* http://www.netlib.org/lapack/explore-html/ |
|
* |
|
*> \htmlonly |
|
*> Download ZLAG2C + dependencies |
|
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/zlag2c.f"> |
|
*> [TGZ]</a> |
|
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/zlag2c.f"> |
|
*> [ZIP]</a> |
|
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/zlag2c.f"> |
|
*> [TXT]</a> |
|
*> \endhtmlonly |
|
* |
|
* Definition: |
|
* =========== |
|
* |
|
* SUBROUTINE ZLAG2C( M, N, A, LDA, SA, LDSA, INFO ) |
|
* |
|
* .. Scalar Arguments .. |
|
* INTEGER INFO, LDA, LDSA, M, N |
|
* .. |
|
* .. Array Arguments .. |
|
* COMPLEX SA( LDSA, * ) |
|
* COMPLEX*16 A( LDA, * ) |
|
* .. |
|
* |
|
* |
|
*> \par Purpose: |
|
* ============= |
|
*> |
|
*> \verbatim |
|
*> |
|
*> ZLAG2C converts a COMPLEX*16 matrix, SA, to a COMPLEX matrix, A. |
|
*> |
|
*> RMAX is the overflow for the SINGLE PRECISION arithmetic |
|
*> ZLAG2C checks that all the entries of A are between -RMAX and |
|
*> RMAX. If not the conversion is aborted and a flag is raised. |
|
*> |
|
*> This is an auxiliary routine so there is no argument checking. |
|
*> \endverbatim |
|
* |
|
* Arguments: |
|
* ========== |
|
* |
|
*> \param[in] M |
|
*> \verbatim |
|
*> M is INTEGER |
|
*> The number of lines of the matrix A. M >= 0. |
|
*> \endverbatim |
|
*> |
|
*> \param[in] N |
|
*> \verbatim |
|
*> N is INTEGER |
|
*> The number of columns of the matrix A. N >= 0. |
|
*> \endverbatim |
|
*> |
|
*> \param[in] A |
|
*> \verbatim |
|
*> A is COMPLEX*16 array, dimension (LDA,N) |
|
*> On entry, the M-by-N coefficient matrix A. |
|
*> \endverbatim |
|
*> |
|
*> \param[in] LDA |
|
*> \verbatim |
|
*> LDA is INTEGER |
|
*> The leading dimension of the array A. LDA >= max(1,M). |
|
*> \endverbatim |
|
*> |
|
*> \param[out] SA |
|
*> \verbatim |
|
*> SA is COMPLEX array, dimension (LDSA,N) |
|
*> On exit, if INFO=0, the M-by-N coefficient matrix SA; if |
|
*> INFO>0, the content 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 SA in exit is unspecified. |
|
*> \endverbatim |
|
* |
|
* Authors: |
|
* ======== |
|
* |
|
*> \author Univ. of Tennessee |
|
*> \author Univ. of California Berkeley |
|
*> \author Univ. of Colorado Denver |
|
*> \author NAG Ltd. |
|
* |
|
*> \ingroup complex16OTHERauxiliary |
|
* |
|
* ===================================================================== |
SUBROUTINE ZLAG2C( M, N, A, LDA, SA, LDSA, INFO ) |
SUBROUTINE ZLAG2C( M, N, A, LDA, SA, LDSA, INFO ) |
* |
* |
* -- LAPACK PROTOTYPE auxiliary routine (version 3.1.2) -- |
* -- LAPACK auxiliary routine -- |
* -- 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..-- |
* August 2007 |
|
* |
* |
* .. |
|
* .. Scalar Arguments .. |
* .. Scalar Arguments .. |
INTEGER INFO, LDA, LDSA, M, N |
INTEGER INFO, LDA, LDSA, M, N |
* .. |
* .. |
Line 14
|
Line 117
|
COMPLEX*16 A( LDA, * ) |
COMPLEX*16 A( LDA, * ) |
* .. |
* .. |
* |
* |
* Purpose |
* ===================================================================== |
* ======= |
|
* |
|
* ZLAG2C converts a COMPLEX*16 matrix, SA, to a COMPLEX matrix, A. |
|
* |
|
* RMAX is the overflow for the SINGLE PRECISION arithmetic |
|
* ZLAG2C 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 |
|
* ========= |
|
* |
|
* M (input) INTEGER |
|
* The number of lines of the matrix A. M >= 0. |
|
* |
|
* N (input) INTEGER |
|
* The number of columns of the matrix A. N >= 0. |
|
* |
|
* A (input) COMPLEX*16 array, dimension (LDA,N) |
|
* On entry, the M-by-N coefficient matrix A. |
|
* |
|
* LDA (input) INTEGER |
|
* The leading dimension of the array A. LDA >= max(1,M). |
|
* |
|
* SA (output) COMPLEX array, dimension (LDSA,N) |
|
* On exit, if INFO=0, the M-by-N coefficient matrix SA; if |
|
* INFO>0, the content 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 SA in exit is unspecified. |
|
* |
|
* ========= |
|
* |
* |
* .. Local Scalars .. |
* .. Local Scalars .. |
INTEGER I, J |
INTEGER I, J |
DOUBLE PRECISION RMAX |
DOUBLE PRECISION RMAX |
* .. |
* .. |
* .. Intrinsic Functions .. |
* .. Intrinsic Functions .. |
INTRINSIC DBLE, DIMAG |
INTRINSIC DBLE, DIMAG, CMPLX |
* .. |
* .. |
* .. External Functions .. |
* .. External Functions .. |
REAL SLAMCH |
REAL SLAMCH |
Line 72
|
Line 136
|
DO 20 J = 1, N |
DO 20 J = 1, N |
DO 10 I = 1, M |
DO 10 I = 1, M |
IF( ( DBLE( A( I, J ) ).LT.-RMAX ) .OR. |
IF( ( DBLE( A( I, J ) ).LT.-RMAX ) .OR. |
+ ( DBLE( A( I, J ) ).GT.RMAX ) .OR. |
$ ( DBLE( A( I, J ) ).GT.RMAX ) .OR. |
+ ( DIMAG( A( I, J ) ).LT.-RMAX ) .OR. |
$ ( DIMAG( A( I, J ) ).LT.-RMAX ) .OR. |
+ ( DIMAG( A( I, J ) ).GT.RMAX ) ) THEN |
$ ( DIMAG( A( I, J ) ).GT.RMAX ) ) THEN |
INFO = 1 |
INFO = 1 |
GO TO 30 |
GO TO 30 |
END IF |
END IF |
SA( I, J ) = A( I, J ) |
SA( I, J ) = CMPLX( A( I, J ) ) |
10 CONTINUE |
10 CONTINUE |
20 CONTINUE |
20 CONTINUE |
INFO = 0 |
INFO = 0 |