/*  -- translated by f2c (version 20240504).
   You must link the resulting object file with libf2c:
	on Microsoft Windows system, link with libf2c.lib;
	on Linux or Unix systems, link with .../path/to/libf2c.a -lm
	or, if you install libf2c.a in a standard place, with -lf2c -lm
	-- in that order, at the end of the command line, as in
		cc *.o -lf2c -lm
	Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,

		http://www.netlib.org/f2c/libf2c.zip
*/

#include "f2c.h"

/* > \brief \b DLASCL multiplies a general rectangular matrix by a real scalar defined as cto/cfrom.   

    =========== DOCUMENTATION ===========   

   Online html documentation available at   
              http://www.netlib.org/lapack/explore-html/   

   > \htmlonly   
   > Download DLASCL + dependencies   
   > <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlascl.
f">   
   > [TGZ]</a>   
   > <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlascl.
f">   
   > [ZIP]</a>   
   > <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlascl.
f">   
   > [TXT]</a>   
   > \endhtmlonly   

    Definition:   
    ===========   

         SUBROUTINE DLASCL( TYPE, KL, KU, CFROM, CTO, M, N, A, LDA, INFO )   

         CHARACTER          TYPE   
         INTEGER            INFO, KL, KU, LDA, M, N   
         DOUBLE PRECISION   CFROM, CTO   
         DOUBLE PRECISION   A( LDA, * )   


   > \par Purpose:   
    =============   
   >   
   > \verbatim   
   >   
   > DLASCL multiplies the M by N real matrix A by the real scalar   
   > CTO/CFROM.  This is done without over/underflow as long as the final   
   > result CTO*A(I,J)/CFROM does not over/underflow. TYPE specifies that   
   > A may be full, upper triangular, lower triangular, upper Hessenberg,   
   > or banded.   
   > \endverbatim   

    Arguments:   
    ==========   

   > \param[in] TYPE   
   > \verbatim   
   >          TYPE is CHARACTER*1   
   >          TYPE indices the storage type of the input matrix.   
   >          = 'G':  A is a full matrix.   
   >          = 'L':  A is a lower triangular matrix.   
   >          = 'U':  A is an upper triangular matrix.   
   >          = 'H':  A is an upper Hessenberg matrix.   
   >          = 'B':  A is a symmetric band matrix with lower bandwidth KL   
   >                  and upper bandwidth KU and with the only the lower   
   >                  half stored.   
   >          = 'Q':  A is a symmetric band matrix with lower bandwidth KL   
   >                  and upper bandwidth KU and with the only the upper   
   >                  half stored.   
   >          = 'Z':  A is a band matrix with lower bandwidth KL and upper   
   >                  bandwidth KU. See DGBTRF for storage details.   
   > \endverbatim   
   >   
   > \param[in] KL   
   > \verbatim   
   >          KL is INTEGER   
   >          The lower bandwidth of A.  Referenced only if TYPE = 'B',   
   >          'Q' or 'Z'.   
   > \endverbatim   
   >   
   > \param[in] KU   
   > \verbatim   
   >          KU is INTEGER   
   >          The upper bandwidth of A.  Referenced only if TYPE = 'B',   
   >          'Q' or 'Z'.   
   > \endverbatim   
   >   
   > \param[in] CFROM   
   > \verbatim   
   >          CFROM is DOUBLE PRECISION   
   > \endverbatim   
   >   
   > \param[in] CTO   
   > \verbatim   
   >          CTO is DOUBLE PRECISION   
   >   
   >          The matrix A is multiplied by CTO/CFROM. A(I,J) is computed   
   >          without over/underflow if the final result CTO*A(I,J)/CFROM   
   >          can be represented without over/underflow.  CFROM must be   
   >          nonzero.   
   > \endverbatim   
   >   
   > \param[in] M   
   > \verbatim   
   >          M is INTEGER   
   >          The number of rows of the matrix A.  M >= 0.   
   > \endverbatim   
   >   
   > \param[in] N   
   > \verbatim   
   >          N is INTEGER   
   >          The number of columns of the matrix A.  N >= 0.   
   > \endverbatim   
   >   
   > \param[in,out] A   
   > \verbatim   
   >          A is DOUBLE PRECISION array, dimension (LDA,N)   
   >          The matrix to be multiplied by CTO/CFROM.  See TYPE for the   
   >          storage type.   
   > \endverbatim   
   >   
   > \param[in] LDA   
   > \verbatim   
   >          LDA is INTEGER   
   >          The leading dimension of the array A.  LDA >= max(1,M).   
   > \endverbatim   
   >   
   > \param[out] INFO   
   > \verbatim   
   >          INFO is INTEGER   
   >          0  - successful exit   
   >          <0 - if INFO = -i, the i-th argument had an illegal value.   
   > \endverbatim   

    Authors:   
    ========   

   > \author Univ. of Tennessee   
   > \author Univ. of California Berkeley   
   > \author Univ. of Colorado Denver   
   > \author NAG Ltd.   

   > \date September 2012   

   > \ingroup auxOTHERauxiliary   

    =====================================================================   
   Subroutine */ int igraphdlascl_(char *type__, integer *kl, integer *ku, 
	doublereal *cfrom, doublereal *cto, integer *m, integer *n, 
	doublereal *a, integer *lda, integer *info)
{
    /* System generated locals */
    integer a_dim1, a_offset, i__1, i__2, i__3, i__4, i__5;

    /* Local variables */
    integer i__, j, k1, k2, k3, k4;
    doublereal mul, cto1;
    logical done;
    doublereal ctoc;
    extern logical igraphlsame_(char *, char *);
    integer itype;
    doublereal cfrom1;
    extern doublereal igraphdlamch_(char *);
    doublereal cfromc;
    extern logical igraphdisnan_(doublereal *);
    extern /* Subroutine */ int igraphxerbla_(char *, integer *, ftnlen);
    doublereal bignum, smlnum;


/*  -- LAPACK auxiliary routine (version 3.4.2) --   
    -- LAPACK is a software package provided by Univ. of Tennessee,    --   
    -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--   
       September 2012   


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


       Test the input arguments   

       Parameter adjustments */
    a_dim1 = *lda;
    a_offset = 1 + a_dim1;
    a -= a_offset;

    /* Function Body */
    *info = 0;

    if (igraphlsame_(type__, "G")) {
	itype = 0;
    } else if (igraphlsame_(type__, "L")) {
	itype = 1;
    } else if (igraphlsame_(type__, "U")) {
	itype = 2;
    } else if (igraphlsame_(type__, "H")) {
	itype = 3;
    } else if (igraphlsame_(type__, "B")) {
	itype = 4;
    } else if (igraphlsame_(type__, "Q")) {
	itype = 5;
    } else if (igraphlsame_(type__, "Z")) {
	itype = 6;
    } else {
	itype = -1;
    }

    if (itype == -1) {
	*info = -1;
    } else if (*cfrom == 0. || igraphdisnan_(cfrom)) {
	*info = -4;
    } else if (igraphdisnan_(cto)) {
	*info = -5;
    } else if (*m < 0) {
	*info = -6;
    } else if (*n < 0 || itype == 4 && *n != *m || itype == 5 && *n != *m) {
	*info = -7;
    } else if (itype <= 3 && *lda < max(1,*m)) {
	*info = -9;
    } else if (itype >= 4) {
/* Computing MAX */
	i__1 = *m - 1;
	if (*kl < 0 || *kl > max(i__1,0)) {
	    *info = -2;
	} else /* if(complicated condition) */ {
/* Computing MAX */
	    i__1 = *n - 1;
	    if (*ku < 0 || *ku > max(i__1,0) || (itype == 4 || itype == 5) && 
		    *kl != *ku) {
		*info = -3;
	    } else if (itype == 4 && *lda < *kl + 1 || itype == 5 && *lda < *
		    ku + 1 || itype == 6 && *lda < (*kl << 1) + *ku + 1) {
		*info = -9;
	    }
	}
    }

    if (*info != 0) {
	i__1 = -(*info);
	igraphxerbla_("DLASCL", &i__1, (ftnlen)6);
	return 0;
    }

/*     Quick return if possible */

    if (*n == 0 || *m == 0) {
	return 0;
    }

/*     Get machine parameters */

    smlnum = igraphdlamch_("S");
    bignum = 1. / smlnum;

    cfromc = *cfrom;
    ctoc = *cto;

L10:
    cfrom1 = cfromc * smlnum;
    if (cfrom1 == cfromc) {
/*        CFROMC is an inf.  Multiply by a correctly signed zero for   
          finite CTOC, or a NaN if CTOC is infinite. */
	mul = ctoc / cfromc;
	done = TRUE_;
	cto1 = ctoc;
    } else {
	cto1 = ctoc / bignum;
	if (cto1 == ctoc) {
/*           CTOC is either 0 or an inf.  In both cases, CTOC itself   
             serves as the correct multiplication factor. */
	    mul = ctoc;
	    done = TRUE_;
	    cfromc = 1.;
	} else if (abs(cfrom1) > abs(ctoc) && ctoc != 0.) {
	    mul = smlnum;
	    done = FALSE_;
	    cfromc = cfrom1;
	} else if (abs(cto1) > abs(cfromc)) {
	    mul = bignum;
	    done = FALSE_;
	    ctoc = cto1;
	} else {
	    mul = ctoc / cfromc;
	    done = TRUE_;
	}
    }

    if (itype == 0) {

/*        Full matrix */

	i__1 = *n;
	for (j = 1; j <= i__1; ++j) {
	    i__2 = *m;
	    for (i__ = 1; i__ <= i__2; ++i__) {
		a[i__ + j * a_dim1] *= mul;
/* L20: */
	    }
/* L30: */
	}

    } else if (itype == 1) {

/*        Lower triangular matrix */

	i__1 = *n;
	for (j = 1; j <= i__1; ++j) {
	    i__2 = *m;
	    for (i__ = j; i__ <= i__2; ++i__) {
		a[i__ + j * a_dim1] *= mul;
/* L40: */
	    }
/* L50: */
	}

    } else if (itype == 2) {

/*        Upper triangular matrix */

	i__1 = *n;
	for (j = 1; j <= i__1; ++j) {
	    i__2 = min(j,*m);
	    for (i__ = 1; i__ <= i__2; ++i__) {
		a[i__ + j * a_dim1] *= mul;
/* L60: */
	    }
/* L70: */
	}

    } else if (itype == 3) {

/*        Upper Hessenberg matrix */

	i__1 = *n;
	for (j = 1; j <= i__1; ++j) {
/* Computing MIN */
	    i__3 = j + 1;
	    i__2 = min(i__3,*m);
	    for (i__ = 1; i__ <= i__2; ++i__) {
		a[i__ + j * a_dim1] *= mul;
/* L80: */
	    }
/* L90: */
	}

    } else if (itype == 4) {

/*        Lower half of a symmetric band matrix */

	k3 = *kl + 1;
	k4 = *n + 1;
	i__1 = *n;
	for (j = 1; j <= i__1; ++j) {
/* Computing MIN */
	    i__3 = k3, i__4 = k4 - j;
	    i__2 = min(i__3,i__4);
	    for (i__ = 1; i__ <= i__2; ++i__) {
		a[i__ + j * a_dim1] *= mul;
/* L100: */
	    }
/* L110: */
	}

    } else if (itype == 5) {

/*        Upper half of a symmetric band matrix */

	k1 = *ku + 2;
	k3 = *ku + 1;
	i__1 = *n;
	for (j = 1; j <= i__1; ++j) {
/* Computing MAX */
	    i__2 = k1 - j;
	    i__3 = k3;
	    for (i__ = max(i__2,1); i__ <= i__3; ++i__) {
		a[i__ + j * a_dim1] *= mul;
/* L120: */
	    }
/* L130: */
	}

    } else if (itype == 6) {

/*        Band matrix */

	k1 = *kl + *ku + 2;
	k2 = *kl + 1;
	k3 = (*kl << 1) + *ku + 1;
	k4 = *kl + *ku + 1 + *m;
	i__1 = *n;
	for (j = 1; j <= i__1; ++j) {
/* Computing MAX */
	    i__3 = k1 - j;
/* Computing MIN */
	    i__4 = k3, i__5 = k4 - j;
	    i__2 = min(i__4,i__5);
	    for (i__ = max(i__3,k2); i__ <= i__2; ++i__) {
		a[i__ + j * a_dim1] *= mul;
/* L140: */
	    }
/* L150: */
	}

    }

    if (! done) {
	goto L10;
    }

    return 0;

/*     End of DLASCL */

} /* igraphdlascl_ */

