/*  -- translated by f2c (version 20100827).
   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"

/* Subroutine */ int splicingdtrmv_(char *uplo, char *trans, char *diag, integer *n, 
	doublereal *a, integer *lda, doublereal *x, integer *incx)
{
    /* System generated locals */
    integer a_dim1, a_offset, i__1, i__2;

    /* Local variables */
    static integer i__, j, ix, jx, kx, info;
    static doublereal temp;
    extern logical splicinglsame_(char *, char *);
    extern /* Subroutine */ int splicingxerbla_(char *, integer *, ftnlen);
    static logical nounit;


/*  Purpose   
    =======   

    DTRMV  performs one of the matrix-vector operations   

       x := A*x,   or   x := A**T*x,   

    where x is an n element vector and  A is an n by n unit, or non-unit,   
    upper or lower triangular matrix.   

    Arguments   
    ==========   

    UPLO   - CHARACTER*1.   
             On entry, UPLO specifies whether the matrix is an upper or   
             lower triangular matrix as follows:   

                UPLO = 'U' or 'u'   A is an upper triangular matrix.   

                UPLO = 'L' or 'l'   A is a lower triangular matrix.   

             Unchanged on exit.   

    TRANS  - CHARACTER*1.   
             On entry, TRANS specifies the operation to be performed as   
             follows:   

                TRANS = 'N' or 'n'   x := A*x.   

                TRANS = 'T' or 't'   x := A**T*x.   

                TRANS = 'C' or 'c'   x := A**T*x.   

             Unchanged on exit.   

    DIAG   - CHARACTER*1.   
             On entry, DIAG specifies whether or not A is unit   
             triangular as follows:   

                DIAG = 'U' or 'u'   A is assumed to be unit triangular.   

                DIAG = 'N' or 'n'   A is not assumed to be unit   
                                    triangular.   

             Unchanged on exit.   

    N      - INTEGER.   
             On entry, N specifies the order of the matrix A.   
             N must be at least zero.   
             Unchanged on exit.   

    A      - DOUBLE PRECISION array of DIMENSION ( LDA, n ).   
             Before entry with  UPLO = 'U' or 'u', the leading n by n   
             upper triangular part of the array A must contain the upper   
             triangular matrix and the strictly lower triangular part of   
             A is not referenced.   
             Before entry with UPLO = 'L' or 'l', the leading n by n   
             lower triangular part of the array A must contain the lower   
             triangular matrix and the strictly upper triangular part of   
             A is not referenced.   
             Note that when  DIAG = 'U' or 'u', the diagonal elements of   
             A are not referenced either, but are assumed to be unity.   
             Unchanged on exit.   

    LDA    - INTEGER.   
             On entry, LDA specifies the first dimension of A as declared   
             in the calling (sub) program. LDA must be at least   
             max( 1, n ).   
             Unchanged on exit.   

    X      - DOUBLE PRECISION array of dimension at least   
             ( 1 + ( n - 1 )*abs( INCX ) ).   
             Before entry, the incremented array X must contain the n   
             element vector x. On exit, X is overwritten with the   
             tranformed vector x.   

    INCX   - INTEGER.   
             On entry, INCX specifies the increment for the elements of   
             X. INCX must not be zero.   
             Unchanged on exit.   

    Further Details   
    ===============   

    Level 2 Blas routine.   
    The vector and matrix arguments are not referenced when N = 0, or M = 0   

    -- Written on 22-October-1986.   
       Jack Dongarra, Argonne National Lab.   
       Jeremy Du Croz, Nag Central Office.   
       Sven Hammarling, Nag Central Office.   
       Richard Hanson, Sandia National Labs.   

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


       Test the input parameters.   

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

    /* Function Body */
    info = 0;
    if (! splicinglsame_(uplo, "U") && ! splicinglsame_(uplo, "L")) {
	info = 1;
    } else if (! splicinglsame_(trans, "N") && ! splicinglsame_(trans, 
	    "T") && ! splicinglsame_(trans, "C")) {
	info = 2;
    } else if (! splicinglsame_(diag, "U") && ! splicinglsame_(diag, 
	    "N")) {
	info = 3;
    } else if (*n < 0) {
	info = 4;
    } else if (*lda < max(1,*n)) {
	info = 6;
    } else if (*incx == 0) {
	info = 8;
    }
    if (info != 0) {
	splicingxerbla_("DTRMV ", &info, (ftnlen)6);
	return 0;
    }

/*     Quick return if possible. */

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

    nounit = splicinglsame_(diag, "N");

/*     Set up the start point in X if the increment is not unity. This   
       will be  ( N - 1 )*INCX  too small for descending loops. */

    if (*incx <= 0) {
	kx = 1 - (*n - 1) * *incx;
    } else if (*incx != 1) {
	kx = 1;
    }

/*     Start the operations. In this version the elements of A are   
       accessed sequentially with one pass through A. */

    if (splicinglsame_(trans, "N")) {

/*        Form  x := A*x. */

	if (splicinglsame_(uplo, "U")) {
	    if (*incx == 1) {
		i__1 = *n;
		for (j = 1; j <= i__1; ++j) {
		    if (x[j] != 0.) {
			temp = x[j];
			i__2 = j - 1;
			for (i__ = 1; i__ <= i__2; ++i__) {
			    x[i__] += temp * a[i__ + j * a_dim1];
/* L10: */
			}
			if (nounit) {
			    x[j] *= a[j + j * a_dim1];
			}
		    }
/* L20: */
		}
	    } else {
		jx = kx;
		i__1 = *n;
		for (j = 1; j <= i__1; ++j) {
		    if (x[jx] != 0.) {
			temp = x[jx];
			ix = kx;
			i__2 = j - 1;
			for (i__ = 1; i__ <= i__2; ++i__) {
			    x[ix] += temp * a[i__ + j * a_dim1];
			    ix += *incx;
/* L30: */
			}
			if (nounit) {
			    x[jx] *= a[j + j * a_dim1];
			}
		    }
		    jx += *incx;
/* L40: */
		}
	    }
	} else {
	    if (*incx == 1) {
		for (j = *n; j >= 1; --j) {
		    if (x[j] != 0.) {
			temp = x[j];
			i__1 = j + 1;
			for (i__ = *n; i__ >= i__1; --i__) {
			    x[i__] += temp * a[i__ + j * a_dim1];
/* L50: */
			}
			if (nounit) {
			    x[j] *= a[j + j * a_dim1];
			}
		    }
/* L60: */
		}
	    } else {
		kx += (*n - 1) * *incx;
		jx = kx;
		for (j = *n; j >= 1; --j) {
		    if (x[jx] != 0.) {
			temp = x[jx];
			ix = kx;
			i__1 = j + 1;
			for (i__ = *n; i__ >= i__1; --i__) {
			    x[ix] += temp * a[i__ + j * a_dim1];
			    ix -= *incx;
/* L70: */
			}
			if (nounit) {
			    x[jx] *= a[j + j * a_dim1];
			}
		    }
		    jx -= *incx;
/* L80: */
		}
	    }
	}
    } else {

/*        Form  x := A**T*x. */

	if (splicinglsame_(uplo, "U")) {
	    if (*incx == 1) {
		for (j = *n; j >= 1; --j) {
		    temp = x[j];
		    if (nounit) {
			temp *= a[j + j * a_dim1];
		    }
		    for (i__ = j - 1; i__ >= 1; --i__) {
			temp += a[i__ + j * a_dim1] * x[i__];
/* L90: */
		    }
		    x[j] = temp;
/* L100: */
		}
	    } else {
		jx = kx + (*n - 1) * *incx;
		for (j = *n; j >= 1; --j) {
		    temp = x[jx];
		    ix = jx;
		    if (nounit) {
			temp *= a[j + j * a_dim1];
		    }
		    for (i__ = j - 1; i__ >= 1; --i__) {
			ix -= *incx;
			temp += a[i__ + j * a_dim1] * x[ix];
/* L110: */
		    }
		    x[jx] = temp;
		    jx -= *incx;
/* L120: */
		}
	    }
	} else {
	    if (*incx == 1) {
		i__1 = *n;
		for (j = 1; j <= i__1; ++j) {
		    temp = x[j];
		    if (nounit) {
			temp *= a[j + j * a_dim1];
		    }
		    i__2 = *n;
		    for (i__ = j + 1; i__ <= i__2; ++i__) {
			temp += a[i__ + j * a_dim1] * x[i__];
/* L130: */
		    }
		    x[j] = temp;
/* L140: */
		}
	    } else {
		jx = kx;
		i__1 = *n;
		for (j = 1; j <= i__1; ++j) {
		    temp = x[jx];
		    ix = jx;
		    if (nounit) {
			temp *= a[j + j * a_dim1];
		    }
		    i__2 = *n;
		    for (i__ = j + 1; i__ <= i__2; ++i__) {
			ix += *incx;
			temp += a[i__ + j * a_dim1] * x[ix];
/* L150: */
		    }
		    x[jx] = temp;
		    jx += *incx;
/* L160: */
		}
	    }
	}
    }

    return 0;

/*     End of DTRMV . */

} /* splicingdtrmv_ */