145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
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#include "f2c.h"
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/* Subroutine */ int claset_(char *uplo, integer *m, integer *n, complex *
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alpha, complex *beta, complex *a, integer *lda)
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{
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/* -- LAPACK auxiliary routine (version 2.0) --
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Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,
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Courant Institute, Argonne National Lab, and Rice University
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October 31, 1992
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Purpose
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=======
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CLASET initializes a 2-D array A to BETA on the diagonal and
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ALPHA on the offdiagonals.
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Arguments
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=========
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UPLO (input) CHARACTER*1
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Specifies the part of the matrix A to be set.
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= 'U': Upper triangular part is set. The lower triangle
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is unchanged.
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= 'L': Lower triangular part is set. The upper triangle
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is unchanged.
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Otherwise: All of the matrix A is set.
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M (input) INTEGER
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On entry, M specifies the number of rows of A.
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N (input) INTEGER
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On entry, N specifies the number of columns of A.
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ALPHA (input) COMPLEX
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All the offdiagonal array elements are set to ALPHA.
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BETA (input) COMPLEX
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All the diagonal array elements are set to BETA.
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A (input/output) COMPLEX array, dimension (LDA,N)
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On entry, the m by n matrix A.
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On exit, A(i,j) = ALPHA, 1 <= i <= m, 1 <= j <= n, i.ne.j;
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A(i,i) = BETA , 1 <= i <= min(m,n)
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LDA (input) INTEGER
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The leading dimension of the array A. LDA >= max(1,M).
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=====================================================================
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Parameter adjustments
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Function Body */
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/* System generated locals */
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integer a_dim1, a_offset, i__1, i__2, i__3;
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/* Local variables */
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static integer i, j;
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extern logical lsame_(char *, char *);
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#define A(I,J) a[(I)-1 + ((J)-1)* ( *lda)]
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if (lsame_(uplo, "U")) {
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/* Set the diagonal to BETA and the strictly upper triangular
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part of the array to ALPHA. */
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i__1 = *n;
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for (j = 2; j <= *n; ++j) {
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/* Computing MIN */
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i__3 = j - 1;
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i__2 = min(i__3,*m);
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for (i = 1; i <= min(j-1,*m); ++i) {
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i__3 = i + j * a_dim1;
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A(i,j).r = alpha->r, A(i,j).i = alpha->i;
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/* L10: */
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}
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/* L20: */
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}
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i__1 = min(*n,*m);
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for (i = 1; i <= min(*n,*m); ++i) {
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i__2 = i + i * a_dim1;
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A(i,i).r = beta->r, A(i,i).i = beta->i;
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/* L30: */
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}
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} else if (lsame_(uplo, "L")) {
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/* Set the diagonal to BETA and the strictly lower triangular
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part of the array to ALPHA. */
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i__1 = min(*m,*n);
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for (j = 1; j <= min(*m,*n); ++j) {
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i__2 = *m;
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for (i = j + 1; i <= *m; ++i) {
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i__3 = i + j * a_dim1;
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A(i,j).r = alpha->r, A(i,j).i = alpha->i;
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/* L40: */
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}
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/* L50: */
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}
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i__1 = min(*n,*m);
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for (i = 1; i <= min(*n,*m); ++i) {
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i__2 = i + i * a_dim1;
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A(i,i).r = beta->r, A(i,i).i = beta->i;
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/* L60: */
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}
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} else {
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/* Set the array to BETA on the diagonal and ALPHA on the
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offdiagonal. */
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i__1 = *n;
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for (j = 1; j <= *n; ++j) {
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i__2 = *m;
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for (i = 1; i <= *m; ++i) {
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i__3 = i + j * a_dim1;
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A(i,j).r = alpha->r, A(i,j).i = alpha->i;
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/* L70: */
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}
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/* L80: */
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}
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i__1 = min(*m,*n);
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for (i = 1; i <= min(*m,*n); ++i) {
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i__2 = i + i * a_dim1;
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A(i,i).r = beta->r, A(i,i).i = beta->i;
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/* L90: */
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}
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}
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return 0;
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/* End of CLASET */
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} /* claset_ */
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