#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 real c_b5 = 0.f;
static real c_b6 = 1.f;

doublereal stzt02_(integer *m, integer *n, real *af, integer *lda, real *tau, 
	real *work, integer *lwork)
{
    /* System generated locals */
    integer af_dim1, af_offset, i__1, i__2;
    real ret_val;

    /* Local variables */
    static integer i__;
    static real rwork[1];
    extern doublereal slamch_(char *), slange_(char *, integer *, 
	    integer *, real *, integer *, real *);
    extern /* Subroutine */ int xerbla_(char *, integer *), slaset_(
	    char *, integer *, integer *, real *, real *, real *, integer *), slatzm_(char *, integer *, integer *, real *, integer *, 
	    real *, real *, real *, integer *, real *);


#define af_ref(a_1,a_2) af[(a_2)*af_dim1 + a_1]


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


    Purpose   
    =======   

    STZT02 returns   
         || I - Q'*Q || / ( M * eps)   
    where the matrix Q is defined by the Householder transformations   
    generated by STZRQF.   

    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) REAL array, dimension (LDA,N)   
            The output of STZRQF.   

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

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

    WORK    (workspace) REAL array, dimension (LWORK)   

    LWORK   (input) INTEGER   
            length of WORK array. Must be >= 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_("STZT02", &c__7);
	return ret_val;
    }

/*     Quick return if possible */

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

/*     Q := I */

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

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

    for (i__ = *m; i__ >= 1; --i__) {
	i__1 = *n - *m + 1;
	slatzm_("Left", &i__1, n, &af_ref(i__, *m + 1), lda, &tau[i__], &work[
		i__], &work[*m + 1], n, &work[*n * *n + 1]);
/* L10: */
    }

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

    i__1 = *m;
    for (i__ = 1; i__ <= i__1; ++i__) {
	i__2 = *n - *m + 1;
	slatzm_("Left", &i__2, n, &af_ref(i__, *m + 1), lda, &tau[i__], &work[
		i__], &work[*m + 1], n, &work[*n * *n + 1]);
/* L20: */
    }

/*     Q := Q - I */

    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
	work[(i__ - 1) * *n + i__] += -1.f;
/* L30: */
    }

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

/*     End of STZT02 */

} /* stzt02_ */

#undef af_ref



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