#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__8 = 8;
static doublecomplex c_b6 = {0.,0.};
static integer c__1 = 1;
static doublecomplex c_b15 = {-1.,0.};

doublereal zrzt01_(integer *m, integer *n, doublecomplex *a, doublecomplex *
	af, integer *lda, doublecomplex *tau, doublecomplex *work, integer *
	lwork)
{
    /* System generated locals */
    integer a_dim1, a_offset, af_dim1, af_offset, i__1, i__2, i__3, i__4;
    doublereal ret_val;

    /* Local variables */
    static integer info, i__, j;
    static doublereal norma, rwork[1];
    extern /* Subroutine */ int zaxpy_(integer *, doublecomplex *, 
	    doublecomplex *, integer *, doublecomplex *, integer *);
    extern doublereal dlamch_(char *);
    extern /* Subroutine */ int xerbla_(char *, integer *);
    extern doublereal zlange_(char *, integer *, integer *, doublecomplex *, 
	    integer *, doublereal *);
    extern /* Subroutine */ int zlaset_(char *, integer *, integer *, 
	    doublecomplex *, doublecomplex *, doublecomplex *, integer *), zunmrz_(char *, char *, integer *, integer *, integer *, 
	    integer *, doublecomplex *, integer *, doublecomplex *, 
	    doublecomplex *, integer *, doublecomplex *, integer *, integer *);


#define a_subscr(a_1,a_2) (a_2)*a_dim1 + a_1
#define a_ref(a_1,a_2) a[a_subscr(a_1,a_2)]
#define af_subscr(a_1,a_2) (a_2)*af_dim1 + a_1
#define af_ref(a_1,a_2) af[af_subscr(a_1,a_2)]


/*  -- LAPACK test routine (version 3.0) --   
       Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,   
       Courant Institute, Argonne National Lab, and Rice University   
       June 30, 1999   


    Purpose   
    =======   

    ZRZT01 returns   
         || A - R*Q || / ( M * eps * ||A|| )   
    for an upper trapezoidal A that was factored with ZTZRZF.   

    Arguments   
    =========   

    M       (input) INTEGER   
            The number of rows of the matrices A and AF.   

    N       (input) INTEGER   
            The number of columns of the matrices A and AF.   

    A       (input) COMPLEX*16 array, dimension (LDA,N)   
            The original upper trapezoidal M by N matrix A.   

    AF      (input) COMPLEX*16 array, dimension (LDA,N)   
            The output of ZTZRZF for input matrix A.   
            The lower triangle is not referenced.   

    LDA     (input) INTEGER   
            The leading dimension of the arrays A and AF.   

    TAU     (input) COMPLEX*16 array, dimension (M)   
            Details of the  Householder transformations as returned by   
            ZTZRZF.   

    WORK    (workspace) COMPLEX*16 array, dimension (LWORK)   

    LWORK   (input) INTEGER   
            The length of the array WORK.  LWORK >= m*n + m.   

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


       Parameter adjustments */
    af_dim1 = *lda;
    af_offset = 1 + af_dim1 * 1;
    af -= af_offset;
    a_dim1 = *lda;
    a_offset = 1 + a_dim1 * 1;
    a -= a_offset;
    --tau;
    --work;

    /* Function Body */
    ret_val = 0.;

    if (*lwork < *m * *n + *m) {
	xerbla_("ZRZT01", &c__8);
	return ret_val;
    }

/*     Quick return if possible */

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

    norma = zlange_("One-norm", m, n, &a[a_offset], lda, rwork);

/*     Copy upper triangle R */

    zlaset_("Full", m, n, &c_b6, &c_b6, &work[1], m);
    i__1 = *m;
    for (j = 1; j <= i__1; ++j) {
	i__2 = j;
	for (i__ = 1; i__ <= i__2; ++i__) {
	    i__3 = (j - 1) * *m + i__;
	    i__4 = af_subscr(i__, j);
	    work[i__3].r = af[i__4].r, work[i__3].i = af[i__4].i;
/* L10: */
	}
/* L20: */
    }

/*     R = R * P(1) * ... *P(m) */

    i__1 = *n - *m;
    i__2 = *lwork - *m * *n;
    zunmrz_("Right", "No tranpose", m, n, m, &i__1, &af[af_offset], lda, &tau[
	    1], &work[1], m, &work[*m * *n + 1], &i__2, &info);

/*     R = R - A */

    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
	zaxpy_(m, &c_b15, &a_ref(1, i__), &c__1, &work[(i__ - 1) * *m + 1], &
		c__1);
/* L30: */
    }

    ret_val = zlange_("One-norm", m, n, &work[1], m, rwork);

    ret_val /= dlamch_("Epsilon") * (doublereal) max(*m,*n);
    if (norma != 0.) {
	ret_val /= norma;
    }

    return ret_val;

/*     End of ZRZT01 */

} /* zrzt01_ */

#undef af_ref
#undef af_subscr
#undef a_ref
#undef a_subscr



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