#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__7 = 7;
static complex c_b5 = {0.f,0.f};
static complex c_b6 = {1.f,0.f};

doublereal crzt02_(integer *m, integer *n, complex *af, integer *lda, complex 
	*tau, complex *work, integer *lwork)
{
    /* System generated locals */
    integer af_dim1, af_offset, i__1, i__2, i__3;
    real ret_val;
    complex q__1;

    /* Local variables */
    static integer info, i__;
    static real rwork[1];
    extern doublereal clange_(char *, integer *, integer *, complex *, 
	    integer *, real *), slamch_(char *);
    extern /* Subroutine */ int claset_(char *, integer *, integer *, complex 
	    *, complex *, complex *, integer *), xerbla_(char *, 
	    integer *), cunmrz_(char *, char *, integer *, integer *, 
	    integer *, integer *, complex *, integer *, complex *, complex *, 
	    integer *, complex *, integer *, integer *);


/*  -- 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   
    =======   

    CRZT02 returns   
         || I - Q'*Q || / ( M * eps)   
    where the matrix Q is defined by the Householder transformations   
    generated by CTZRZF.   

    Arguments   
    =========   

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

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

    AF      (input) COMPLEX array, dimension (LDA,N)   
            The output of CTZRZF.   

    LDA     (input) INTEGER   
            The leading dimension of the array AF.   

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

    WORK    (workspace) COMPLEX array, dimension (LWORK)   

    LWORK   (input) INTEGER   
            Length of WORK array. LWORK >= N*N+N.   

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


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

    /* Function Body */
    ret_val = 0.f;

    if (*lwork < *n * *n + *n) {
	xerbla_("CRZT02", &c__7);
	return ret_val;
    }

/*     Quick return if possible */

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

/*     Q := I */

    claset_("Full", n, n, &c_b5, &c_b6, &work[1], n);

/*     Q := P(1) * ... * P(m) * Q */

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

/*     Q := P(m)' * ... * P(1)' * Q */

    i__1 = *n - *m;
    i__2 = *lwork - *n * *n;
    cunmrz_("Left", "Conjugate transpose", n, n, m, &i__1, &af[af_offset], 
	    lda, &tau[1], &work[1], n, &work[*n * *n + 1], &i__2, &info);

/*     Q := Q - I */

    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
	i__2 = (i__ - 1) * *n + i__;
	i__3 = (i__ - 1) * *n + i__;
	q__1.r = work[i__3].r - 1.f, q__1.i = work[i__3].i;
	work[i__2].r = q__1.r, work[i__2].i = q__1.i;
/* L10: */
    }

    ret_val = clange_("One-norm", n, n, &work[1], n, rwork) / (
	    slamch_("Epsilon") * (real) max(*m,*n));
    return ret_val;

/*     End of CRZT02 */

} /* crzt02_ */


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