/* ./src_f77/cunmr2.f -- translated by f2c (version 20030320).
   You must link the resulting object file with the libraries:
	-lf2c -lm   (in that order)
*/

#include <punc/vf2c.h>

/* Subroutine */ int cunmr2_(char *side, char *trans, integer *m, integer *n, 
	integer *k, complex *a, integer *lda, complex *tau, complex *c__, 
	integer *ldc, complex *work, integer *info, ftnlen side_len, ftnlen 
	trans_len)
{
    /* System generated locals */
    integer a_dim1, a_offset, c_dim1, c_offset, i__1, i__2, i__3;
    complex q__1;

    /* Builtin functions */
    void r_cnjg(complex *, complex *);

    /* Local variables */
    static integer i__, i1, i2, i3, mi, ni, nq;
    static complex aii;
    static logical left;
    static complex taui;
    extern /* Subroutine */ int clarf_(char *, integer *, integer *, complex *
	    , integer *, complex *, complex *, integer *, complex *, ftnlen);
    extern logical lsame_(char *, char *, ftnlen, ftnlen);
    extern /* Subroutine */ int clacgv_(integer *, complex *, integer *), 
	    xerbla_(char *, integer *, ftnlen);
    static logical notran;


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

/*     .. Scalar Arguments .. */
/*     .. */
/*     .. Array Arguments .. */
/*     .. */

/*  Purpose */
/*  ======= */

/*  CUNMR2 overwrites the general complex m-by-n matrix C with */

/*        Q * C  if SIDE = 'L' and TRANS = 'N', or */

/*        Q'* C  if SIDE = 'L' and TRANS = 'C', or */

/*        C * Q  if SIDE = 'R' and TRANS = 'N', or */

/*        C * Q' if SIDE = 'R' and TRANS = 'C', */

/*  where Q is a complex unitary matrix defined as the product of k */
/*  elementary reflectors */

/*        Q = H(1)' H(2)' . . . H(k)' */

/*  as returned by CGERQF. Q is of order m if SIDE = 'L' and of order n */
/*  if SIDE = 'R'. */

/*  Arguments */
/*  ========= */

/*  SIDE    (input) CHARACTER*1 */
/*          = 'L': apply Q or Q' from the Left */
/*          = 'R': apply Q or Q' from the Right */

/*  TRANS   (input) CHARACTER*1 */
/*          = 'N': apply Q  (No transpose) */
/*          = 'C': apply Q' (Conjugate transpose) */

/*  M       (input) INTEGER */
/*          The number of rows of the matrix C. M >= 0. */

/*  N       (input) INTEGER */
/*          The number of columns of the matrix C. N >= 0. */

/*  K       (input) INTEGER */
/*          The number of elementary reflectors whose product defines */
/*          the matrix Q. */
/*          If SIDE = 'L', M >= K >= 0; */
/*          if SIDE = 'R', N >= K >= 0. */

/*  A       (input) COMPLEX array, dimension */
/*                               (LDA,M) if SIDE = 'L', */
/*                               (LDA,N) if SIDE = 'R' */
/*          The i-th row must contain the vector which defines the */
/*          elementary reflector H(i), for i = 1,2,...,k, as returned by */
/*          CGERQF in the last k rows of its array argument A. */
/*          A is modified by the routine but restored on exit. */

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

/*  TAU     (input) COMPLEX array, dimension (K) */
/*          TAU(i) must contain the scalar factor of the elementary */
/*          reflector H(i), as returned by CGERQF. */

/*  C       (input/output) COMPLEX array, dimension (LDC,N) */
/*          On entry, the m-by-n matrix C. */
/*          On exit, C is overwritten by Q*C or Q'*C or C*Q' or C*Q. */

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

/*  WORK    (workspace) COMPLEX array, dimension */
/*                                   (N) if SIDE = 'L', */
/*                                   (M) if SIDE = 'R' */

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

/*  ===================================================================== */

/*     .. Parameters .. */
/*     .. */
/*     .. Local Scalars .. */
/*     .. */
/*     .. External Functions .. */
/*     .. */
/*     .. External Subroutines .. */
/*     .. */
/*     .. Intrinsic Functions .. */
/*     .. */
/*     .. Executable Statements .. */

/*     Test the input arguments */

    /* Parameter adjustments */
    a_dim1 = *lda;
    a_offset = 1 + a_dim1;
    a -= a_offset;
    --tau;
    c_dim1 = *ldc;
    c_offset = 1 + c_dim1;
    c__ -= c_offset;
    --work;

    /* Function Body */
    *info = 0;
    left = lsame_(side, "L", (ftnlen)1, (ftnlen)1);
    notran = lsame_(trans, "N", (ftnlen)1, (ftnlen)1);

/*     NQ is the order of Q */

    if (left) {
	nq = *m;
    } else {
	nq = *n;
    }
    if (! left && ! lsame_(side, "R", (ftnlen)1, (ftnlen)1)) {
	*info = -1;
    } else if (! notran && ! lsame_(trans, "C", (ftnlen)1, (ftnlen)1)) {
	*info = -2;
    } else if (*m < 0) {
	*info = -3;
    } else if (*n < 0) {
	*info = -4;
    } else if (*k < 0 || *k > nq) {
	*info = -5;
    } else if (*lda < max(1,*k)) {
	*info = -7;
    } else if (*ldc < max(1,*m)) {
	*info = -10;
    }
    if (*info != 0) {
	i__1 = -(*info);
	xerbla_("CUNMR2", &i__1, (ftnlen)6);
	return 0;
    }

/*     Quick return if possible */

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

    if (left && ! notran || ! left && notran) {
	i1 = 1;
	i2 = *k;
	i3 = 1;
    } else {
	i1 = *k;
	i2 = 1;
	i3 = -1;
    }

    if (left) {
	ni = *n;
    } else {
	mi = *m;
    }

    i__1 = i2;
    i__2 = i3;
    for (i__ = i1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) {
	if (left) {

/*           H(i) or H(i)' is applied to C(1:m-k+i,1:n) */

	    mi = *m - *k + i__;
	} else {

/*           H(i) or H(i)' is applied to C(1:m,1:n-k+i) */

	    ni = *n - *k + i__;
	}

/*        Apply H(i) or H(i)' */

	if (notran) {
	    r_cnjg(&q__1, &tau[i__]);
	    taui.r = q__1.r, taui.i = q__1.i;
	} else {
	    i__3 = i__;
	    taui.r = tau[i__3].r, taui.i = tau[i__3].i;
	}
	i__3 = nq - *k + i__ - 1;
	clacgv_(&i__3, &a[i__ + a_dim1], lda);
	i__3 = i__ + (nq - *k + i__) * a_dim1;
	aii.r = a[i__3].r, aii.i = a[i__3].i;
	i__3 = i__ + (nq - *k + i__) * a_dim1;
	a[i__3].r = 1.f, a[i__3].i = 0.f;
	clarf_(side, &mi, &ni, &a[i__ + a_dim1], lda, &taui, &c__[c_offset], 
		ldc, &work[1], (ftnlen)1);
	i__3 = i__ + (nq - *k + i__) * a_dim1;
	a[i__3].r = aii.r, a[i__3].i = aii.i;
	i__3 = nq - *k + i__ - 1;
	clacgv_(&i__3, &a[i__ + a_dim1], lda);
/* L10: */
    }
    return 0;

/*     End of CUNMR2 */

} /* cunmr2_ */

