#include "blaswrap.h"
/*  -- translated by f2c (version 19990503).
   You must link the resulting object file with the libraries:
	-lf2c -lm   (in that order)
*/

#include "f2c.h"

/* Table of constant values */

static integer c__2 = 2;
static integer c__1 = 1;
static doublereal c_b35 = 2.;
static doublereal c_b46 = 1.;
static integer c_n1 = -1;

/* Subroutine */ int dlattr_(integer *imat, char *uplo, char *trans, char *
	diag, integer *iseed, integer *n, doublereal *a, integer *lda, 
	doublereal *b, doublereal *work, integer *info)
{
    /* System generated locals */
    integer a_dim1, a_offset, i__1, i__2, i__3;
    doublereal d__1, d__2;

    /* Builtin functions   
       Subroutine */ int s_copy(char *, char *, ftnlen, ftnlen);
    double pow_dd(doublereal *, doublereal *), sqrt(doublereal), d_sign(
	    doublereal *, doublereal *);

    /* Local variables */
    static doublereal sfac;
    static integer mode;
    static char path[3], dist[1];
    static doublereal unfl;
    extern /* Subroutine */ int drot_(integer *, doublereal *, integer *, 
	    doublereal *, integer *, doublereal *, doublereal *);
    static doublereal rexp;
    static char type__[1];
    static doublereal texp, star1, c__, plus1, plus2;
    static integer i__, j;
    static doublereal s, bscal;
    extern /* Subroutine */ int dscal_(integer *, doublereal *, doublereal *, 
	    integer *);
    static doublereal x, y, z__;
    extern logical lsame_(char *, char *);
    static doublereal tscal, anorm, bnorm, tleft;
    extern /* Subroutine */ int dcopy_(integer *, doublereal *, integer *, 
	    doublereal *, integer *), drotg_(doublereal *, doublereal *, 
	    doublereal *, doublereal *), dswap_(integer *, doublereal *, 
	    integer *, doublereal *, integer *);
    static logical upper;
    extern /* Subroutine */ int dlatb4_(char *, integer *, integer *, integer 
	    *, char *, integer *, integer *, doublereal *, integer *, 
	    doublereal *, char *), dlabad_(doublereal 
	    *, doublereal *);
    static doublereal ra, rb;
    static integer kl;
    extern doublereal dlamch_(char *);
    static integer ku, iy;
    extern integer idamax_(integer *, doublereal *, integer *);
    extern doublereal dlarnd_(integer *, integer *);
    static doublereal bignum, cndnum;
    extern /* Subroutine */ int dlatms_(integer *, integer *, char *, integer 
	    *, char *, doublereal *, integer *, doublereal *, doublereal *, 
	    integer *, integer *, char *, doublereal *, integer *, doublereal 
	    *, integer *), dlarnv_(integer *, integer 
	    *, integer *, doublereal *);
    static integer jcount;
    static doublereal smlnum, ulp;


#define a_ref(a_1,a_2) a[(a_2)*a_dim1 + a_1]


/*  -- LAPACK test routine (version 3.0) --   
       Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,   
       Courant Institute, Argonne National Lab, and Rice University   
       September 30, 1994   


    Purpose   
    =======   

    DLATTR generates a triangular test matrix.   
    IMAT and UPLO uniquely specify the properties of the test   
    matrix, which is returned in the array A.   

    Arguments   
    =========   

    IMAT    (input) INTEGER   
            An integer key describing which matrix to generate for this   
            path.   

    UPLO    (input) CHARACTER*1   
            Specifies whether the matrix A will be upper or lower   
            triangular.   
            = 'U':  Upper triangular   
            = 'L':  Lower triangular   

    TRANS   (input) CHARACTER*1   
            Specifies whether the matrix or its transpose will be used.   
            = 'N':  No transpose   
            = 'T':  Transpose   
            = 'C':  Conjugate transpose (= Transpose)   

    DIAG    (output) CHARACTER*1   
            Specifies whether or not the matrix A is unit triangular.   
            = 'N':  Non-unit triangular   
            = 'U':  Unit triangular   

    ISEED   (input/output) INTEGER array, dimension (4)   
            The seed vector for the random number generator (used in   
            DLATMS).  Modified on exit.   

    N       (input) INTEGER   
            The order of the matrix to be generated.   

    A       (output) DOUBLE PRECISION array, dimension (LDA,N)   
            The triangular matrix A.  If UPLO = 'U', the leading n by n   
            upper triangular part of the array A contains the upper   
            triangular matrix, and the strictly lower triangular part of   
            A is not referenced.  If UPLO = 'L', the leading n by n lower   
            triangular part of the array A contains the lower triangular   
            matrix, and the strictly upper triangular part of A is not   
            referenced.  If DIAG = 'U', the diagonal elements of A are   
            set so that A(k,k) = k for 1 <= k <= n.   

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

    B       (output) DOUBLE PRECISION array, dimension (N)   
            The right hand side vector, if IMAT > 10.   

    WORK    (workspace) DOUBLE PRECISION array, dimension (3*N)   

    INFO    (output) INTEGER   
            = 0:  successful exit   
            < 0: if INFO = -k, the k-th argument had an illegal value   

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


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

    /* Function Body */
    s_copy(path, "Double precision", (ftnlen)1, (ftnlen)16);
    s_copy(path + 1, "TR", (ftnlen)2, (ftnlen)2);
    unfl = dlamch_("Safe minimum");
    ulp = dlamch_("Epsilon") * dlamch_("Base");
    smlnum = unfl;
    bignum = (1. - ulp) / smlnum;
    dlabad_(&smlnum, &bignum);
    if (*imat >= 7 && *imat <= 10 || *imat == 18) {
	*(unsigned char *)diag = 'U';
    } else {
	*(unsigned char *)diag = 'N';
    }
    *info = 0;

/*     Quick return if N.LE.0. */

    if (*n <= 0) {
	return 0;
    }

/*     Call DLATB4 to set parameters for SLATMS. */

    upper = lsame_(uplo, "U");
    if (upper) {
	dlatb4_(path, imat, n, n, type__, &kl, &ku, &anorm, &mode, &cndnum, 
		dist);
    } else {
	i__1 = -(*imat);
	dlatb4_(path, &i__1, n, n, type__, &kl, &ku, &anorm, &mode, &cndnum, 
		dist);
    }

/*     IMAT <= 6:  Non-unit triangular matrix */

    if (*imat <= 6) {
	dlatms_(n, n, dist, &iseed[1], type__, &b[1], &mode, &cndnum, &anorm, 
		&kl, &ku, "No packing", &a[a_offset], lda, &work[1], info);

/*     IMAT > 6:  Unit triangular matrix   
       The diagonal is deliberately set to something other than 1.   

       IMAT = 7:  Matrix is the identity */

    } else if (*imat == 7) {
	if (upper) {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		i__2 = j - 1;
		for (i__ = 1; i__ <= i__2; ++i__) {
		    a_ref(i__, j) = 0.;
/* L10: */
		}
		a_ref(j, j) = (doublereal) j;
/* L20: */
	    }
	} else {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		a_ref(j, j) = (doublereal) j;
		i__2 = *n;
		for (i__ = j + 1; i__ <= i__2; ++i__) {
		    a_ref(i__, j) = 0.;
/* L30: */
		}
/* L40: */
	    }
	}

/*     IMAT > 7:  Non-trivial unit triangular matrix   

       Generate a unit triangular matrix T with condition CNDNUM by   
       forming a triangular matrix with known singular values and   
       filling in the zero entries with Givens rotations. */

    } else if (*imat <= 10) {
	if (upper) {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		i__2 = j - 1;
		for (i__ = 1; i__ <= i__2; ++i__) {
		    a_ref(i__, j) = 0.;
/* L50: */
		}
		a_ref(j, j) = (doublereal) j;
/* L60: */
	    }
	} else {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		a_ref(j, j) = (doublereal) j;
		i__2 = *n;
		for (i__ = j + 1; i__ <= i__2; ++i__) {
		    a_ref(i__, j) = 0.;
/* L70: */
		}
/* L80: */
	    }
	}

/*        Since the trace of a unit triangular matrix is 1, the product   
          of its singular values must be 1.  Let s = sqrt(CNDNUM),   
          x = sqrt(s) - 1/sqrt(s), y = sqrt(2/(n-2))*x, and z = x**2.   
          The following triangular matrix has singular values s, 1, 1,   
          ..., 1, 1/s:   

          1  y  y  y  ...  y  y  z   
             1  0  0  ...  0  0  y   
                1  0  ...  0  0  y   
                   .  ...  .  .  .   
                       .   .  .  .   
                           1  0  y   
                              1  y   
                                 1   

          To fill in the zeros, we first multiply by a matrix with small   
          condition number of the form   

          1  0  0  0  0  ...   
             1  +  *  0  0  ...   
                1  +  0  0  0   
                   1  +  *  0  0   
                      1  +  0  0   
                         ...   
                            1  +  0   
                               1  0   
                                  1   

          Each element marked with a '*' is formed by taking the product   
          of the adjacent elements marked with '+'.  The '*'s can be   
          chosen freely, and the '+'s are chosen so that the inverse of   
          T will have elements of the same magnitude as T.  If the *'s in   
          both T and inv(T) have small magnitude, T is well conditioned.   
          The two offdiagonals of T are stored in WORK.   

          The product of these two matrices has the form   

          1  y  y  y  y  y  .  y  y  z   
             1  +  *  0  0  .  0  0  y   
                1  +  0  0  .  0  0  y   
                   1  +  *  .  .  .  .   
                      1  +  .  .  .  .   
                         .  .  .  .  .   
                            .  .  .  .   
                               1  +  y   
                                  1  y   
                                     1   

          Now we multiply by Givens rotations, using the fact that   

                [  c   s ] [  1   w ] [ -c  -s ] =  [  1  -w ]   
                [ -s   c ] [  0   1 ] [  s  -c ]    [  0   1 ]   
          and   
                [ -c  -s ] [  1   0 ] [  c   s ] =  [  1   0 ]   
                [  s  -c ] [  w   1 ] [ -s   c ]    [ -w   1 ]   

          where c = w / sqrt(w**2+4) and s = 2 / sqrt(w**2+4). */

	star1 = .25;
	sfac = .5;
	plus1 = sfac;
	i__1 = *n;
	for (j = 1; j <= i__1; j += 2) {
	    plus2 = star1 / plus1;
	    work[j] = plus1;
	    work[*n + j] = star1;
	    if (j + 1 <= *n) {
		work[j + 1] = plus2;
		work[*n + j + 1] = 0.;
		plus1 = star1 / plus2;
		rexp = dlarnd_(&c__2, &iseed[1]);
		star1 *= pow_dd(&sfac, &rexp);
		if (rexp < 0.) {
		    d__1 = 1. - rexp;
		    star1 = -pow_dd(&sfac, &d__1);
		} else {
		    d__1 = rexp + 1.;
		    star1 = pow_dd(&sfac, &d__1);
		}
	    }
/* L90: */
	}

	x = sqrt(cndnum) - 1 / sqrt(cndnum);
	if (*n > 2) {
	    y = sqrt(2. / (*n - 2)) * x;
	} else {
	    y = 0.;
	}
	z__ = x * x;

	if (upper) {
	    if (*n > 3) {
		i__1 = *n - 3;
		i__2 = *lda + 1;
		dcopy_(&i__1, &work[1], &c__1, &a_ref(2, 3), &i__2);
		if (*n > 4) {
		    i__1 = *n - 4;
		    i__2 = *lda + 1;
		    dcopy_(&i__1, &work[*n + 1], &c__1, &a_ref(2, 4), &i__2);
		}
	    }
	    i__1 = *n - 1;
	    for (j = 2; j <= i__1; ++j) {
		a_ref(1, j) = y;
		a_ref(j, *n) = y;
/* L100: */
	    }
	    a_ref(1, *n) = z__;
	} else {
	    if (*n > 3) {
		i__1 = *n - 3;
		i__2 = *lda + 1;
		dcopy_(&i__1, &work[1], &c__1, &a_ref(3, 2), &i__2);
		if (*n > 4) {
		    i__1 = *n - 4;
		    i__2 = *lda + 1;
		    dcopy_(&i__1, &work[*n + 1], &c__1, &a_ref(4, 2), &i__2);
		}
	    }
	    i__1 = *n - 1;
	    for (j = 2; j <= i__1; ++j) {
		a_ref(j, 1) = y;
		a_ref(*n, j) = y;
/* L110: */
	    }
	    a_ref(*n, 1) = z__;
	}

/*        Fill in the zeros using Givens rotations. */

	if (upper) {
	    i__1 = *n - 1;
	    for (j = 1; j <= i__1; ++j) {
		ra = a_ref(j, j + 1);
		rb = 2.;
		drotg_(&ra, &rb, &c__, &s);

/*              Multiply by [ c  s; -s  c] on the left. */

		if (*n > j + 1) {
		    i__2 = *n - j - 1;
		    drot_(&i__2, &a_ref(j, j + 2), lda, &a_ref(j + 1, j + 2), 
			    lda, &c__, &s);
		}

/*              Multiply by [-c -s;  s -c] on the right. */

		if (j > 1) {
		    i__2 = j - 1;
		    d__1 = -c__;
		    d__2 = -s;
		    drot_(&i__2, &a_ref(1, j + 1), &c__1, &a_ref(1, j), &c__1,
			     &d__1, &d__2);
		}

/*              Negate A(J,J+1). */

		a_ref(j, j + 1) = -a_ref(j, j + 1);
/* L120: */
	    }
	} else {
	    i__1 = *n - 1;
	    for (j = 1; j <= i__1; ++j) {
		ra = a_ref(j + 1, j);
		rb = 2.;
		drotg_(&ra, &rb, &c__, &s);

/*              Multiply by [ c -s;  s  c] on the right. */

		if (*n > j + 1) {
		    i__2 = *n - j - 1;
		    d__1 = -s;
		    drot_(&i__2, &a_ref(j + 2, j + 1), &c__1, &a_ref(j + 2, j)
			    , &c__1, &c__, &d__1);
		}

/*              Multiply by [-c  s; -s -c] on the left. */

		if (j > 1) {
		    i__2 = j - 1;
		    d__1 = -c__;
		    drot_(&i__2, &a_ref(j, 1), lda, &a_ref(j + 1, 1), lda, &
			    d__1, &s);
		}

/*              Negate A(J+1,J). */

		a_ref(j + 1, j) = -a_ref(j + 1, j);
/* L130: */
	    }
	}

/*     IMAT > 10:  Pathological test cases.  These triangular matrices   
       are badly scaled or badly conditioned, so when used in solving a   
       triangular system they may cause overflow in the solution vector. */

    } else if (*imat == 11) {

/*        Type 11:  Generate a triangular matrix with elements between   
          -1 and 1. Give the diagonal norm 2 to make it well-conditioned.   
          Make the right hand side large so that it requires scaling. */

	if (upper) {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		dlarnv_(&c__2, &iseed[1], &j, &a_ref(1, j));
		a_ref(j, j) = d_sign(&c_b35, &a_ref(j, j));
/* L140: */
	    }
	} else {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		i__2 = *n - j + 1;
		dlarnv_(&c__2, &iseed[1], &i__2, &a_ref(j, j));
		a_ref(j, j) = d_sign(&c_b35, &a_ref(j, j));
/* L150: */
	    }
	}

/*        Set the right hand side so that the largest value is BIGNUM. */

	dlarnv_(&c__2, &iseed[1], n, &b[1]);
	iy = idamax_(n, &b[1], &c__1);
	bnorm = (d__1 = b[iy], abs(d__1));
	bscal = bignum / max(1.,bnorm);
	dscal_(n, &bscal, &b[1], &c__1);

    } else if (*imat == 12) {

/*        Type 12:  Make the first diagonal element in the solve small to   
          cause immediate overflow when dividing by T(j,j).   
          In type 12, the offdiagonal elements are small (CNORM(j) < 1). */

	dlarnv_(&c__2, &iseed[1], n, &b[1]);
/* Computing MAX */
	d__1 = 1., d__2 = (doublereal) (*n - 1);
	tscal = 1. / max(d__1,d__2);
	if (upper) {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		dlarnv_(&c__2, &iseed[1], &j, &a_ref(1, j));
		i__2 = j - 1;
		dscal_(&i__2, &tscal, &a_ref(1, j), &c__1);
		a_ref(j, j) = d_sign(&c_b46, &a_ref(j, j));
/* L160: */
	    }
	    a_ref(*n, *n) = smlnum * a_ref(*n, *n);
	} else {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		i__2 = *n - j + 1;
		dlarnv_(&c__2, &iseed[1], &i__2, &a_ref(j, j));
		if (*n > j) {
		    i__2 = *n - j;
		    dscal_(&i__2, &tscal, &a_ref(j + 1, j), &c__1);
		}
		a_ref(j, j) = d_sign(&c_b46, &a_ref(j, j));
/* L170: */
	    }
	    a_ref(1, 1) = smlnum * a_ref(1, 1);
	}

    } else if (*imat == 13) {

/*        Type 13:  Make the first diagonal element in the solve small to   
          cause immediate overflow when dividing by T(j,j).   
          In type 13, the offdiagonal elements are O(1) (CNORM(j) > 1). */

	dlarnv_(&c__2, &iseed[1], n, &b[1]);
	if (upper) {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		dlarnv_(&c__2, &iseed[1], &j, &a_ref(1, j));
		a_ref(j, j) = d_sign(&c_b46, &a_ref(j, j));
/* L180: */
	    }
	    a_ref(*n, *n) = smlnum * a_ref(*n, *n);
	} else {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		i__2 = *n - j + 1;
		dlarnv_(&c__2, &iseed[1], &i__2, &a_ref(j, j));
		a_ref(j, j) = d_sign(&c_b46, &a_ref(j, j));
/* L190: */
	    }
	    a_ref(1, 1) = smlnum * a_ref(1, 1);
	}

    } else if (*imat == 14) {

/*        Type 14:  T is diagonal with small numbers on the diagonal to   
          make the growth factor underflow, but a small right hand side   
          chosen so that the solution does not overflow. */

	if (upper) {
	    jcount = 1;
	    for (j = *n; j >= 1; --j) {
		i__1 = j - 1;
		for (i__ = 1; i__ <= i__1; ++i__) {
		    a_ref(i__, j) = 0.;
/* L200: */
		}
		if (jcount <= 2) {
		    a_ref(j, j) = smlnum;
		} else {
		    a_ref(j, j) = 1.;
		}
		++jcount;
		if (jcount > 4) {
		    jcount = 1;
		}
/* L210: */
	    }
	} else {
	    jcount = 1;
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		i__2 = *n;
		for (i__ = j + 1; i__ <= i__2; ++i__) {
		    a_ref(i__, j) = 0.;
/* L220: */
		}
		if (jcount <= 2) {
		    a_ref(j, j) = smlnum;
		} else {
		    a_ref(j, j) = 1.;
		}
		++jcount;
		if (jcount > 4) {
		    jcount = 1;
		}
/* L230: */
	    }
	}

/*        Set the right hand side alternately zero and small. */

	if (upper) {
	    b[1] = 0.;
	    for (i__ = *n; i__ >= 2; i__ += -2) {
		b[i__] = 0.;
		b[i__ - 1] = smlnum;
/* L240: */
	    }
	} else {
	    b[*n] = 0.;
	    i__1 = *n - 1;
	    for (i__ = 1; i__ <= i__1; i__ += 2) {
		b[i__] = 0.;
		b[i__ + 1] = smlnum;
/* L250: */
	    }
	}

    } else if (*imat == 15) {

/*        Type 15:  Make the diagonal elements small to cause gradual   
          overflow when dividing by T(j,j).  To control the amount of   
          scaling needed, the matrix is bidiagonal.   

   Computing MAX */
	d__1 = 1., d__2 = (doublereal) (*n - 1);
	texp = 1. / max(d__1,d__2);
	tscal = pow_dd(&smlnum, &texp);
	dlarnv_(&c__2, &iseed[1], n, &b[1]);
	if (upper) {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		i__2 = j - 2;
		for (i__ = 1; i__ <= i__2; ++i__) {
		    a_ref(i__, j) = 0.;
/* L260: */
		}
		if (j > 1) {
		    a_ref(j - 1, j) = -1.;
		}
		a_ref(j, j) = tscal;
/* L270: */
	    }
	    b[*n] = 1.;
	} else {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		i__2 = *n;
		for (i__ = j + 2; i__ <= i__2; ++i__) {
		    a_ref(i__, j) = 0.;
/* L280: */
		}
		if (j < *n) {
		    a_ref(j + 1, j) = -1.;
		}
		a_ref(j, j) = tscal;
/* L290: */
	    }
	    b[1] = 1.;
	}

    } else if (*imat == 16) {

/*        Type 16:  One zero diagonal element. */

	iy = *n / 2 + 1;
	if (upper) {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		dlarnv_(&c__2, &iseed[1], &j, &a_ref(1, j));
		if (j != iy) {
		    a_ref(j, j) = d_sign(&c_b35, &a_ref(j, j));
		} else {
		    a_ref(j, j) = 0.;
		}
/* L300: */
	    }
	} else {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		i__2 = *n - j + 1;
		dlarnv_(&c__2, &iseed[1], &i__2, &a_ref(j, j));
		if (j != iy) {
		    a_ref(j, j) = d_sign(&c_b35, &a_ref(j, j));
		} else {
		    a_ref(j, j) = 0.;
		}
/* L310: */
	    }
	}
	dlarnv_(&c__2, &iseed[1], n, &b[1]);
	dscal_(n, &c_b35, &b[1], &c__1);

    } else if (*imat == 17) {

/*        Type 17:  Make the offdiagonal elements large to cause overflow   
          when adding a column of T.  In the non-transposed case, the   
          matrix is constructed to cause overflow when adding a column in   
          every other step. */

	tscal = unfl / ulp;
	tscal = (1. - ulp) / tscal;
	i__1 = *n;
	for (j = 1; j <= i__1; ++j) {
	    i__2 = *n;
	    for (i__ = 1; i__ <= i__2; ++i__) {
		a_ref(i__, j) = 0.;
/* L320: */
	    }
/* L330: */
	}
	texp = 1.;
	if (upper) {
	    for (j = *n; j >= 2; j += -2) {
		a_ref(1, j) = -tscal / (doublereal) (*n + 1);
		a_ref(j, j) = 1.;
		b[j] = texp * (1. - ulp);
		a_ref(1, j - 1) = -(tscal / (doublereal) (*n + 1)) / (
			doublereal) (*n + 2);
		a_ref(j - 1, j - 1) = 1.;
		b[j - 1] = texp * (doublereal) (*n * *n + *n - 1);
		texp *= 2.;
/* L340: */
	    }
	    b[1] = (doublereal) (*n + 1) / (doublereal) (*n + 2) * tscal;
	} else {
	    i__1 = *n - 1;
	    for (j = 1; j <= i__1; j += 2) {
		a_ref(*n, j) = -tscal / (doublereal) (*n + 1);
		a_ref(j, j) = 1.;
		b[j] = texp * (1. - ulp);
		a_ref(*n, j + 1) = -(tscal / (doublereal) (*n + 1)) / (
			doublereal) (*n + 2);
		a_ref(j + 1, j + 1) = 1.;
		b[j + 1] = texp * (doublereal) (*n * *n + *n - 1);
		texp *= 2.;
/* L350: */
	    }
	    b[*n] = (doublereal) (*n + 1) / (doublereal) (*n + 2) * tscal;
	}

    } else if (*imat == 18) {

/*        Type 18:  Generate a unit triangular matrix with elements   
          between -1 and 1, and make the right hand side large so that it   
          requires scaling. */

	if (upper) {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		i__2 = j - 1;
		dlarnv_(&c__2, &iseed[1], &i__2, &a_ref(1, j));
		a_ref(j, j) = 0.;
/* L360: */
	    }
	} else {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		if (j < *n) {
		    i__2 = *n - j;
		    dlarnv_(&c__2, &iseed[1], &i__2, &a_ref(j + 1, j));
		}
		a_ref(j, j) = 0.;
/* L370: */
	    }
	}

/*        Set the right hand side so that the largest value is BIGNUM. */

	dlarnv_(&c__2, &iseed[1], n, &b[1]);
	iy = idamax_(n, &b[1], &c__1);
	bnorm = (d__1 = b[iy], abs(d__1));
	bscal = bignum / max(1.,bnorm);
	dscal_(n, &bscal, &b[1], &c__1);

    } else if (*imat == 19) {

/*        Type 19:  Generate a triangular matrix with elements between   
          BIGNUM/(n-1) and BIGNUM so that at least one of the column   
          norms will exceed BIGNUM.   
          1/3/91:  DLATRS no longer can handle this case   

   Computing MAX */
	d__1 = 1., d__2 = (doublereal) (*n - 1);
	tleft = bignum / max(d__1,d__2);
/* Computing MAX */
	d__1 = 1., d__2 = (doublereal) (*n);
	tscal = bignum * ((doublereal) (*n - 1) / max(d__1,d__2));
	if (upper) {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		dlarnv_(&c__2, &iseed[1], &j, &a_ref(1, j));
		i__2 = j;
		for (i__ = 1; i__ <= i__2; ++i__) {
		    a_ref(i__, j) = d_sign(&tleft, &a_ref(i__, j)) + tscal * 
			    a_ref(i__, j);
/* L380: */
		}
/* L390: */
	    }
	} else {
	    i__1 = *n;
	    for (j = 1; j <= i__1; ++j) {
		i__2 = *n - j + 1;
		dlarnv_(&c__2, &iseed[1], &i__2, &a_ref(j, j));
		i__2 = *n;
		for (i__ = j; i__ <= i__2; ++i__) {
		    a_ref(i__, j) = d_sign(&tleft, &a_ref(i__, j)) + tscal * 
			    a_ref(i__, j);
/* L400: */
		}
/* L410: */
	    }
	}
	dlarnv_(&c__2, &iseed[1], n, &b[1]);
	dscal_(n, &c_b35, &b[1], &c__1);
    }

/*     Flip the matrix if the transpose will be used. */

    if (! lsame_(trans, "N")) {
	if (upper) {
	    i__1 = *n / 2;
	    for (j = 1; j <= i__1; ++j) {
		i__2 = *n - (j << 1) + 1;
		dswap_(&i__2, &a_ref(j, j), lda, &a_ref(j + 1, *n - j + 1), &
			c_n1);
/* L420: */
	    }
	} else {
	    i__1 = *n / 2;
	    for (j = 1; j <= i__1; ++j) {
		i__2 = *n - (j << 1) + 1;
		i__3 = -(*lda);
		dswap_(&i__2, &a_ref(j, j), &c__1, &a_ref(*n - j + 1, j + 1), 
			&i__3);
/* L430: */
	    }
	}
    }

    return 0;

/*     End of DLATTR */

} /* dlattr_ */

#undef a_ref


