#include "f2c.h"

/* Subroutine */ int dlaset_(char *uplo, integer *m, integer *n, doublereal *

	alpha, doublereal *beta, doublereal *a, integer *lda)

{

/*  -- LAPACK auxiliary routine (version 2.0) --   

       Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,   

       Courant Institute, Argonne National Lab, and Rice University   

       October 31, 1992   

    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).   

   ===================================================================== 

       Function Body */

    /* System generated locals */

    integer i__1, i__2, i__3;

    /* Local variables */

    static integer i, j;

    extern logical lsame_(char *, char *);

#define A(I,J) a[(I)-1 + ((J)-1)* ( *lda)]

    if (lsame_(uplo, "U")) {

/*        Set the strictly upper triangular or trapezoidal part of the

          array to ALPHA. */

	i__1 = *n;

	for (j = 2; j <= *n; ++j) {

/* Computing MIN */

	    i__3 = j - 1;

	    i__2 = min(i__3,*m);

	    for (i = 1; i <= min(j-1,*m); ++i) {

		A(i,j) = *alpha;

/* L10: */

	    }

/* L20: */

	}

    } else if (lsame_(uplo, "L")) {

/*        Set the strictly lower triangular or trapezoidal part of the

          array to ALPHA. */

	i__1 = min(*m,*n);

	for (j = 1; j <= min(*m,*n); ++j) {

	    i__2 = *m;

	    for (i = j + 1; i <= *m; ++i) {

		A(i,j) = *alpha;

/* L30: */

	    }

/* L40: */

	}

    } else {

/*        Set the leading m-by-n submatrix to ALPHA. */

	i__1 = *n;

	for (j = 1; j <= *n; ++j) {

	    i__2 = *m;

	    for (i = 1; i <= *m; ++i) {

		A(i,j) = *alpha;

/* L50: */

	    }

/* L60: */

	}

    }

/*     Set the first min(M,N) diagonal elements to BETA. */

    i__1 = min(*m,*n);

    for (i = 1; i <= min(*m,*n); ++i) {

	A(i,i) = *beta;

/* L70: */

    }

    return 0;

/*     End of DLASET */

} /* dlaset_ */