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- SUBROUTINE DLASET( 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
- DOUBLE PRECISION ALPHA, BETA
-* ..
-* .. Array Arguments ..
- DOUBLE PRECISION A( LDA, * )
-* ..
-*
-* Purpose
-* =======
-*
-* DLASET initializes an m-by-n matrix 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 strictly lower
-* triangular part of A is not changed.
-* = 'L': Lower triangular part is set; the strictly upper
-* triangular part of A is not changed.
-* Otherwise: All of the matrix A is set.
-*
-* M (input) INTEGER
-* The number of rows of the matrix A. M >= 0.
-*
-* N (input) INTEGER
-* The number of columns of the matrix A. N >= 0.
-*
-* ALPHA (input) DOUBLE PRECISION
-* The constant to which the offdiagonal elements are to be set.
-*
-* BETA (input) DOUBLE PRECISION
-* The constant to which the diagonal elements are to be set.
-*
-* A (input/output) DOUBLE PRECISION array, dimension (LDA,N)
-* On exit, the leading m-by-n submatrix of A is set as follows:
-*
-* if UPLO = 'U', A(i,j) = ALPHA, 1<=i<=j-1, 1<=j<=n,
-* if UPLO = 'L', A(i,j) = ALPHA, j+1<=i<=m, 1<=j<=n,
-* otherwise, A(i,j) = ALPHA, 1<=i<=m, 1<=j<=n, i.ne.j,
-*
-* and, for all UPLO, 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 strictly upper triangular or trapezoidal 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
-*
- ELSE IF( LSAME( UPLO, 'L' ) ) THEN
-*
-* Set the strictly lower triangular or trapezoidal part of the
-* array to ALPHA.
-*
- DO 40 J = 1, MIN( M, N )
- DO 30 I = J + 1, M
- A( I, J ) = ALPHA
- 30 CONTINUE
- 40 CONTINUE
-*
- ELSE
-*
-* Set the leading m-by-n submatrix to ALPHA.
-*
- DO 60 J = 1, N
- DO 50 I = 1, M
- A( I, J ) = ALPHA
- 50 CONTINUE
- 60 CONTINUE
- END IF
-*
-* Set the first min(M,N) diagonal elements to BETA.
-*
- DO 70 I = 1, MIN( M, N )
- A( I, I ) = BETA
- 70 CONTINUE
-*
- RETURN
-*
-* End of DLASET
-*
- END