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152 lines
4.0 KiB
152 lines
4.0 KiB
/* slaset.f -- translated by f2c (version 20061008). |
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You must link the resulting object file with libf2c: |
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on Microsoft Windows system, link with libf2c.lib; |
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on Linux or Unix systems, link with .../path/to/libf2c.a -lm |
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or, if you install libf2c.a in a standard place, with -lf2c -lm |
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-- in that order, at the end of the command line, as in |
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cc *.o -lf2c -lm |
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Source for libf2c is in /netlib/f2c/libf2c.zip, e.g., |
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http://www.netlib.org/f2c/libf2c.zip |
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*/ |
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#include "clapack.h" |
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/* Subroutine */ int slaset_(char *uplo, integer *m, integer *n, real *alpha, |
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real *beta, real *a, integer *lda) |
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{ |
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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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integer i__, j; |
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extern logical lsame_(char *, char *); |
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/* -- LAPACK auxiliary routine (version 3.2) -- */ |
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/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */ |
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/* November 2006 */ |
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/* .. Scalar Arguments .. */ |
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/* .. */ |
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/* .. Array Arguments .. */ |
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/* .. */ |
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/* Purpose */ |
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/* ======= */ |
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/* SLASET initializes an m-by-n matrix 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 strictly lower */ |
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/* triangular part of A is not changed. */ |
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/* = 'L': Lower triangular part is set; the strictly upper */ |
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/* triangular part of A is not changed. */ |
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/* Otherwise: All of the matrix A is set. */ |
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/* M (input) INTEGER */ |
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/* The number of rows of the matrix A. M >= 0. */ |
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/* N (input) INTEGER */ |
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/* The number of columns of the matrix A. N >= 0. */ |
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/* ALPHA (input) REAL */ |
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/* The constant to which the offdiagonal elements are to be set. */ |
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/* BETA (input) REAL */ |
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/* The constant to which the diagonal elements are to be set. */ |
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/* A (input/output) REAL array, dimension (LDA,N) */ |
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/* On exit, the leading m-by-n submatrix of A is set as follows: */ |
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/* if UPLO = 'U', A(i,j) = ALPHA, 1<=i<=j-1, 1<=j<=n, */ |
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/* if UPLO = 'L', A(i,j) = ALPHA, j+1<=i<=m, 1<=j<=n, */ |
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/* otherwise, A(i,j) = ALPHA, 1<=i<=m, 1<=j<=n, i.ne.j, */ |
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/* and, for all UPLO, 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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/* .. Local Scalars .. */ |
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/* .. */ |
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/* .. External Functions .. */ |
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/* .. */ |
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/* .. Intrinsic Functions .. */ |
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/* .. */ |
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/* .. Executable Statements .. */ |
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/* Parameter adjustments */ |
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a_dim1 = *lda; |
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a_offset = 1 + a_dim1; |
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a -= a_offset; |
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/* Function Body */ |
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if (lsame_(uplo, "U")) { |
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/* Set the strictly upper triangular or trapezoidal part of the */ |
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/* array to ALPHA. */ |
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i__1 = *n; |
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for (j = 2; j <= i__1; ++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__ <= i__2; ++i__) { |
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a[i__ + j * a_dim1] = *alpha; |
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/* L10: */ |
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} |
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/* L20: */ |
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} |
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} else if (lsame_(uplo, "L")) { |
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/* Set the strictly lower triangular or trapezoidal part of the */ |
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/* array to ALPHA. */ |
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i__1 = min(*m,*n); |
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for (j = 1; j <= i__1; ++j) { |
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i__2 = *m; |
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for (i__ = j + 1; i__ <= i__2; ++i__) { |
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a[i__ + j * a_dim1] = *alpha; |
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/* L30: */ |
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} |
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/* L40: */ |
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} |
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} else { |
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/* Set the leading m-by-n submatrix to ALPHA. */ |
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i__1 = *n; |
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for (j = 1; j <= i__1; ++j) { |
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i__2 = *m; |
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for (i__ = 1; i__ <= i__2; ++i__) { |
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a[i__ + j * a_dim1] = *alpha; |
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/* L50: */ |
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} |
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/* L60: */ |
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} |
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} |
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/* Set the first min(M,N) diagonal elements to BETA. */ |
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i__1 = min(*m,*n); |
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for (i__ = 1; i__ <= i__1; ++i__) { |
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a[i__ + i__ * a_dim1] = *beta; |
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/* L70: */ |
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} |
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return 0; |
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/* End of SLASET */ |
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} /* slaset_ */
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