#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"

/* Common Block Declarations */

struct {
    char srnamt[6];
} srnamc_;

#define srnamc_1 srnamc_

/* Table of constant values */

static real c_b6 = -1e10f;
static real c_b11 = 0.f;
static real c_b16 = -1.f;
static real c_b17 = 1.f;

/* Subroutine */ int slqt01_(integer *m, integer *n, real *a, real *af, real *
	q, real *l, integer *lda, real *tau, real *work, integer *lwork, real 
	*rwork, real *result)
{
    /* System generated locals */
    integer a_dim1, a_offset, af_dim1, af_offset, l_dim1, l_offset, q_dim1, 
	    q_offset, i__1;

    /* Builtin functions   
       Subroutine */ int s_copy(char *, char *, ftnlen, ftnlen);

    /* Local variables */
    static integer info;
    static real resid;
    extern /* Subroutine */ int sgemm_(char *, char *, integer *, integer *, 
	    integer *, real *, real *, integer *, real *, integer *, real *, 
	    real *, integer *);
    static real anorm;
    static integer minmn;
    extern /* Subroutine */ int ssyrk_(char *, char *, integer *, integer *, 
	    real *, real *, integer *, real *, real *, integer *);
    extern doublereal slamch_(char *), slange_(char *, integer *, 
	    integer *, real *, integer *, real *);
    extern /* Subroutine */ int sgelqf_(integer *, integer *, real *, integer 
	    *, real *, real *, integer *, integer *), slacpy_(char *, integer 
	    *, integer *, real *, integer *, real *, integer *), 
	    slaset_(char *, integer *, integer *, real *, real *, real *, 
	    integer *), sorglq_(integer *, integer *, integer *, real 
	    *, integer *, real *, real *, integer *, integer *);
    extern doublereal slansy_(char *, char *, integer *, real *, integer *, 
	    real *);
    static real eps;


#define q_ref(a_1,a_2) q[(a_2)*q_dim1 + a_1]
#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   
    =======   

    SLQT01 tests SGELQF, which computes the LQ factorization of an m-by-n   
    matrix A, and partially tests SORGLQ which forms the n-by-n   
    orthogonal matrix Q.   

    SLQT01 compares L with A*Q', and checks that Q is orthogonal.   

    Arguments   
    =========   

    M       (input) INTEGER   
            The number of rows of the matrix A.  M >= 0.   

    N       (input) INTEGER   
            The number of columns of the matrix A.  N >= 0.   

    A       (input) REAL array, dimension (LDA,N)   
            The m-by-n matrix A.   

    AF      (output) REAL array, dimension (LDA,N)   
            Details of the LQ factorization of A, as returned by SGELQF.   
            See SGELQF for further details.   

    Q       (output) REAL array, dimension (LDA,N)   
            The n-by-n orthogonal matrix Q.   

    L       (workspace) REAL array, dimension (LDA,max(M,N))   

    LDA     (input) INTEGER   
            The leading dimension of the arrays A, AF, Q and L.   
            LDA >= max(M,N).   

    TAU     (output) REAL array, dimension (min(M,N))   
            The scalar factors of the elementary reflectors, as returned   
            by SGELQF.   

    WORK    (workspace) REAL array, dimension (LWORK)   

    LWORK   (input) INTEGER   
            The dimension of the array WORK.   

    RWORK   (workspace) REAL array, dimension (max(M,N))   

    RESULT  (output) REAL array, dimension (2)   
            The test ratios:   
            RESULT(1) = norm( L - A*Q' ) / ( N * norm(A) * EPS )   
            RESULT(2) = norm( I - Q*Q' ) / ( N * EPS )   

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


       Parameter adjustments */
    l_dim1 = *lda;
    l_offset = 1 + l_dim1 * 1;
    l -= l_offset;
    q_dim1 = *lda;
    q_offset = 1 + q_dim1 * 1;
    q -= q_offset;
    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;
    --rwork;
    --result;

    /* Function Body */
    minmn = min(*m,*n);
    eps = slamch_("Epsilon");

/*     Copy the matrix A to the array AF. */

    slacpy_("Full", m, n, &a[a_offset], lda, &af[af_offset], lda);

/*     Factorize the matrix A in the array AF. */

    s_copy(srnamc_1.srnamt, "SGELQF", (ftnlen)6, (ftnlen)6);
    sgelqf_(m, n, &af[af_offset], lda, &tau[1], &work[1], lwork, &info);

/*     Copy details of Q */

    slaset_("Full", n, n, &c_b6, &c_b6, &q[q_offset], lda);
    if (*n > 1) {
	i__1 = *n - 1;
	slacpy_("Upper", m, &i__1, &af_ref(1, 2), lda, &q_ref(1, 2), lda);
    }

/*     Generate the n-by-n matrix Q */

    s_copy(srnamc_1.srnamt, "SORGLQ", (ftnlen)6, (ftnlen)6);
    sorglq_(n, n, &minmn, &q[q_offset], lda, &tau[1], &work[1], lwork, &info);

/*     Copy L */

    slaset_("Full", m, n, &c_b11, &c_b11, &l[l_offset], lda);
    slacpy_("Lower", m, n, &af[af_offset], lda, &l[l_offset], lda);

/*     Compute L - A*Q' */

    sgemm_("No transpose", "Transpose", m, n, n, &c_b16, &a[a_offset], lda, &
	    q[q_offset], lda, &c_b17, &l[l_offset], lda);

/*     Compute norm( L - Q'*A ) / ( N * norm(A) * EPS ) . */

    anorm = slange_("1", m, n, &a[a_offset], lda, &rwork[1]);
    resid = slange_("1", m, n, &l[l_offset], lda, &rwork[1]);
    if (anorm > 0.f) {
	result[1] = resid / (real) max(1,*n) / anorm / eps;
    } else {
	result[1] = 0.f;
    }

/*     Compute I - Q*Q' */

    slaset_("Full", n, n, &c_b11, &c_b17, &l[l_offset], lda);
    ssyrk_("Upper", "No transpose", n, n, &c_b16, &q[q_offset], lda, &c_b17, &
	    l[l_offset], lda);

/*     Compute norm( I - Q*Q' ) / ( N * EPS ) . */

    resid = slansy_("1", "Upper", n, &l[l_offset], lda, &rwork[1]);

    result[2] = resid / (real) max(1,*n) / eps;

    return 0;

/*     End of SLQT01 */

} /* slqt01_ */

#undef af_ref
#undef q_ref


