115 lines
3.0 KiB
FortranFixed
115 lines
3.0 KiB
FortranFixed
SUBROUTINE CLASET( UPLO, M, N, ALPHA, BETA, A, LDA )
|
|
*
|
|
* -- LAPACK auxiliary routine (version 3.1) --
|
|
* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
|
|
* November 2006
|
|
*
|
|
* .. Scalar Arguments ..
|
|
CHARACTER UPLO
|
|
INTEGER LDA, M, N
|
|
COMPLEX ALPHA, BETA
|
|
* ..
|
|
* .. Array Arguments ..
|
|
COMPLEX A( LDA, * )
|
|
* ..
|
|
*
|
|
* Purpose
|
|
* =======
|
|
*
|
|
* CLASET initializes a 2-D array A to BETA on the diagonal and
|
|
* ALPHA on the offdiagonals.
|
|
*
|
|
* Arguments
|
|
* =========
|
|
*
|
|
* UPLO (input) CHARACTER*1
|
|
* Specifies the part of the matrix A to be set.
|
|
* = 'U': Upper triangular part is set. The lower triangle
|
|
* is unchanged.
|
|
* = 'L': Lower triangular part is set. The upper triangle
|
|
* is unchanged.
|
|
* Otherwise: All of the matrix A is set.
|
|
*
|
|
* M (input) INTEGER
|
|
* On entry, M specifies the number of rows of A.
|
|
*
|
|
* N (input) INTEGER
|
|
* On entry, N specifies the number of columns of A.
|
|
*
|
|
* ALPHA (input) COMPLEX
|
|
* All the offdiagonal array elements are set to ALPHA.
|
|
*
|
|
* BETA (input) COMPLEX
|
|
* All the diagonal array elements are set to BETA.
|
|
*
|
|
* A (input/output) COMPLEX array, dimension (LDA,N)
|
|
* On entry, the m by n matrix A.
|
|
* On exit, A(i,j) = ALPHA, 1 <= i <= m, 1 <= j <= n, i.ne.j;
|
|
* A(i,i) = BETA , 1 <= i <= min(m,n)
|
|
*
|
|
* LDA (input) INTEGER
|
|
* The leading dimension of the array A. LDA >= max(1,M).
|
|
*
|
|
* =====================================================================
|
|
*
|
|
* .. Local Scalars ..
|
|
INTEGER I, J
|
|
* ..
|
|
* .. External Functions ..
|
|
LOGICAL LSAME
|
|
EXTERNAL LSAME
|
|
* ..
|
|
* .. Intrinsic Functions ..
|
|
INTRINSIC MIN
|
|
* ..
|
|
* .. Executable Statements ..
|
|
*
|
|
IF( LSAME( UPLO, 'U' ) ) THEN
|
|
*
|
|
* Set the diagonal to BETA and the strictly upper triangular
|
|
* part of the array to ALPHA.
|
|
*
|
|
DO 20 J = 2, N
|
|
DO 10 I = 1, MIN( J-1, M )
|
|
A( I, J ) = ALPHA
|
|
10 CONTINUE
|
|
20 CONTINUE
|
|
DO 30 I = 1, MIN( N, M )
|
|
A( I, I ) = BETA
|
|
30 CONTINUE
|
|
*
|
|
ELSE IF( LSAME( UPLO, 'L' ) ) THEN
|
|
*
|
|
* Set the diagonal to BETA and the strictly lower triangular
|
|
* part of the array to ALPHA.
|
|
*
|
|
DO 50 J = 1, MIN( M, N )
|
|
DO 40 I = J + 1, M
|
|
A( I, J ) = ALPHA
|
|
40 CONTINUE
|
|
50 CONTINUE
|
|
DO 60 I = 1, MIN( N, M )
|
|
A( I, I ) = BETA
|
|
60 CONTINUE
|
|
*
|
|
ELSE
|
|
*
|
|
* Set the array to BETA on the diagonal and ALPHA on the
|
|
* offdiagonal.
|
|
*
|
|
DO 80 J = 1, N
|
|
DO 70 I = 1, M
|
|
A( I, J ) = ALPHA
|
|
70 CONTINUE
|
|
80 CONTINUE
|
|
DO 90 I = 1, MIN( M, N )
|
|
A( I, I ) = BETA
|
|
90 CONTINUE
|
|
END IF
|
|
*
|
|
RETURN
|
|
*
|
|
* End of CLASET
|
|
*
|
|
END
|