/*  -- 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"

/* Table of constant values */

static doublereal c_b4 = 1.;
static doublereal c_b5 = 0.;
static integer c__1 = 1;

/* Subroutine */ int splicingdlarf_(char *side, integer *m, integer *n, doublereal *v,
	 integer *incv, doublereal *tau, doublereal *c__, integer *ldc, 
	doublereal *work)
{
    /* System generated locals */
    integer c_dim1, c_offset;
    doublereal d__1;

    /* Local variables */
    static integer i__;
    static logical applyleft;
    extern /* Subroutine */ int splicingdger_(integer *, integer *, doublereal *, 
	    doublereal *, integer *, doublereal *, integer *, doublereal *, 
	    integer *);
    extern logical splicinglsame_(char *, char *);
    extern /* Subroutine */ int splicingdgemv_(char *, integer *, integer *, 
	    doublereal *, doublereal *, integer *, doublereal *, integer *, 
	    doublereal *, doublereal *, integer *);
    static integer lastc, lastv;
    extern integer splicingiladlc_(integer *, integer *, doublereal *, integer *), 
	    splicingiladlr_(integer *, integer *, doublereal *, integer *);


/*  -- LAPACK auxiliary routine (version 3.3.1) --   
    -- LAPACK is a software package provided by Univ. of Tennessee,    --   
    -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--   
    -- April 2011                                                      --   


    Purpose   
    =======   

    DLARF applies a real elementary reflector H to a real m by n matrix   
    C, from either the left or the right. H is represented in the form   

          H = I - tau * v * v**T   

    where tau is a real scalar and v is a real vector.   

    If tau = 0, then H is taken to be the unit matrix.   

    Arguments   
    =========   

    SIDE    (input) CHARACTER*1   
            = 'L': form  H * C   
            = 'R': form  C * H   

    M       (input) INTEGER   
            The number of rows of the matrix C.   

    N       (input) INTEGER   
            The number of columns of the matrix C.   

    V       (input) DOUBLE PRECISION array, dimension   
                       (1 + (M-1)*abs(INCV)) if SIDE = 'L'   
                    or (1 + (N-1)*abs(INCV)) if SIDE = 'R'   
            The vector v in the representation of H. V is not used if   
            TAU = 0.   

    INCV    (input) INTEGER   
            The increment between elements of v. INCV <> 0.   

    TAU     (input) DOUBLE PRECISION   
            The value tau in the representation of H.   

    C       (input/output) DOUBLE PRECISION array, dimension (LDC,N)   
            On entry, the m by n matrix C.   
            On exit, C is overwritten by the matrix H * C if SIDE = 'L',   
            or C * H if SIDE = 'R'.   

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

    WORK    (workspace) DOUBLE PRECISION array, dimension   
                           (N) if SIDE = 'L'   
                        or (M) if SIDE = 'R'   

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


       Parameter adjustments */
    --v;
    c_dim1 = *ldc;
    c_offset = 1 + c_dim1;
    c__ -= c_offset;
    --work;

    /* Function Body */
    applyleft = splicinglsame_(side, "L");
    lastv = 0;
    lastc = 0;
    if (*tau != 0.) {
/*     Set up variables for scanning V.  LASTV begins pointing to the end   
       of V. */
	if (applyleft) {
	    lastv = *m;
	} else {
	    lastv = *n;
	}
	if (*incv > 0) {
	    i__ = (lastv - 1) * *incv + 1;
	} else {
	    i__ = 1;
	}
/*     Look for the last non-zero row in V. */
	while(lastv > 0 && v[i__] == 0.) {
	    --lastv;
	    i__ -= *incv;
	}
	if (applyleft) {
/*     Scan for the last non-zero column in C(1:lastv,:). */
	    lastc = splicingiladlc_(&lastv, n, &c__[c_offset], ldc);
	} else {
/*     Scan for the last non-zero row in C(:,1:lastv). */
	    lastc = splicingiladlr_(m, &lastv, &c__[c_offset], ldc);
	}
    }
/*     Note that lastc.eq.0 renders the BLAS operations null; no special   
       case is needed at this level. */
    if (applyleft) {

/*        Form  H * C */

	if (lastv > 0) {

/*           w(1:lastc,1) := C(1:lastv,1:lastc)**T * v(1:lastv,1) */

	    splicingdgemv_("Transpose", &lastv, &lastc, &c_b4, &c__[c_offset], ldc, &
		    v[1], incv, &c_b5, &work[1], &c__1);

/*           C(1:lastv,1:lastc) := C(...) - v(1:lastv,1) * w(1:lastc,1)**T */

	    d__1 = -(*tau);
	    splicingdger_(&lastv, &lastc, &d__1, &v[1], incv, &work[1], &c__1, &c__[
		    c_offset], ldc);
	}
    } else {

/*        Form  C * H */

	if (lastv > 0) {

/*           w(1:lastc,1) := C(1:lastc,1:lastv) * v(1:lastv,1) */

	    splicingdgemv_("No transpose", &lastc, &lastv, &c_b4, &c__[c_offset], ldc,
		     &v[1], incv, &c_b5, &work[1], &c__1);

/*           C(1:lastc,1:lastv) := C(...) - w(1:lastc,1) * v(1:lastv,1)**T */

	    d__1 = -(*tau);
	    splicingdger_(&lastc, &lastv, &d__1, &work[1], &c__1, &v[1], incv, &c__[
		    c_offset], ldc);
	}
    }
    return 0;

/*     End of DLARF */

} /* splicingdlarf_ */