/* Copyright (c) 1992-2008 The University of Tennessee.  All rights reserved.
 * See file COPYING in this directory for details. */

#ifdef __cplusplus
extern "C" {
#endif

#include "f2c.h"
#include "hypre_lapack.h"

doublereal dlange_(const char *norm, integer *m, integer *n, doublereal *a, integer
	*lda, doublereal *work)
{
/*  -- LAPACK auxiliary routine (version 3.0) --
       Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,
       Courant Institute, Argonne National Lab, and Rice University
       October 31, 1992


    Purpose
    =======

    DLANGE  returns the value of the one norm,  or the Frobenius norm, or
    the  infinity norm,  or the  element of  largest absolute value  of a
    real matrix A.

    Description
    ===========

    DLANGE returns the value

       DLANGE = ( max(abs(A(i,j))), NORM = 'M' or 'm'
                (
                ( norm1(A),         NORM = '1', 'O' or 'o'
                (
                ( normI(A),         NORM = 'I' or 'i'
                (
                ( normF(A),         NORM = 'F', 'f', 'E' or 'e'

    where  norm1  denotes the  one norm of a matrix (maximum column sum),
    normI  denotes the  infinity norm  of a matrix  (maximum row sum) and
    normF  denotes the  Frobenius norm of a matrix (square root of sum of
    squares).  Note that  max(abs(A(i,j)))  is not a  matrix norm.

    Arguments
    =========

    NORM    (input) CHARACTER*1
            Specifies the value to be returned in DLANGE as described
            above.

    M       (input) INTEGER
            The number of rows of the matrix A.  M >= 0.  When M = 0,
            DLANGE is set to zero.

    N       (input) INTEGER
            The number of columns of the matrix A.  N >= 0.  When N = 0,
            DLANGE is set to zero.

    A       (input) DOUBLE PRECISION array, dimension (LDA,N)
            The m by n matrix A.

    LDA     (input) INTEGER
            The leading dimension of the array A.  LDA >= max(M,1).

    WORK    (workspace) DOUBLE PRECISION array, dimension (LWORK),
            where LWORK >= M when NORM = 'I'; otherwise, WORK is not
            referenced.

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


       Parameter adjustments */
    /* Table of constant values */
    integer c__1 = 1;

    /* System generated locals */
    integer a_dim1, a_offset, i__1, i__2;
    doublereal ret_val, d__1, d__2, d__3;
    /* Builtin functions */
    /*doublereal sqrt(doublereal);*/
    /* Local variables */
    integer i__, j;
    doublereal scale;
    extern logical lsame_(const char *,const char *);
    doublereal value;
    extern /* Subroutine */ integer dlassq_(integer *, doublereal *, integer *,
	    doublereal *, doublereal *);
    doublereal sum;
#define a_ref(a_1,a_2) a[(a_2)*a_dim1 + a_1]


    a_dim1 = *lda;
    a_offset = 1 + a_dim1 * 1;
    a -= a_offset;
    --work;
    value = 0.;

    /* Function Body */
    if (min(*m,*n) == 0) {
	value = 0.;
    } else if (lsame_(norm, "M")) {

/*        Find max(abs(A(i,j))). */

	value = 0.;
	i__1 = *n;
	for (j = 1; j <= i__1; ++j) {
	    i__2 = *m;
	    for (i__ = 1; i__ <= i__2; ++i__) {
/* Computing MAX */
		d__2 = value, d__3 = (d__1 = a_ref(i__, j), abs(d__1));
		value = max(d__2,d__3);
/* L10: */
	    }
/* L20: */
	}
    } else if (lsame_(norm, "O") || *(unsigned char *)
	    norm == '1') {

/*        Find norm1(A). */

	value = 0.;
	i__1 = *n;
	for (j = 1; j <= i__1; ++j) {
	    sum = 0.;
	    i__2 = *m;
	    for (i__ = 1; i__ <= i__2; ++i__) {
		sum += (d__1 = a_ref(i__, j), abs(d__1));
/* L30: */
	    }
	    value = max(value,sum);
/* L40: */
	}
    } else if (lsame_(norm, "I")) {

/*        Find normI(A). */

	i__1 = *m;
	for (i__ = 1; i__ <= i__1; ++i__) {
	    work[i__] = 0.;
/* L50: */
	}
	i__1 = *n;
	for (j = 1; j <= i__1; ++j) {
	    i__2 = *m;
	    for (i__ = 1; i__ <= i__2; ++i__) {
		work[i__] += (d__1 = a_ref(i__, j), abs(d__1));
/* L60: */
	    }
/* L70: */
	}
	value = 0.;
	i__1 = *m;
	for (i__ = 1; i__ <= i__1; ++i__) {
/* Computing MAX */
	    d__1 = value, d__2 = work[i__];
	    value = max(d__1,d__2);
/* L80: */
	}
    } else if (lsame_(norm, "F") || lsame_(norm, "E")) {

/*        Find normF(A). */

	scale = 0.;
	sum = 1.;
	i__1 = *n;
	for (j = 1; j <= i__1; ++j) {
	    dlassq_(m, &a_ref(1, j), &c__1, &scale, &sum);
/* L90: */
	}
	value = scale * sqrt(sum);
    }

    ret_val = value;
    return ret_val;

/*     End of DLANGE */

} /* dlange_ */

#undef a_ref

#ifdef __cplusplus
}
#endif
