#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 complex c_b1 = {0.f,0.f};
static complex c_b2 = {1.f,0.f};
static integer c__1 = 1;

/* Subroutine */ int cget52_(logical *left, integer *n, complex *a, integer *
	lda, complex *b, integer *ldb, complex *e, integer *lde, complex *
	alpha, complex *beta, complex *work, real *rwork, real *result)
{
    /* System generated locals */
    integer a_dim1, a_offset, b_dim1, b_offset, e_dim1, e_offset, i__1, i__2, 
	    i__3;
    real r__1, r__2, r__3, r__4, r__5, r__6;
    complex q__1;

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

    /* Local variables */
    static integer jvec;
    static real temp1;
    static integer j;
    static complex betai;
    static real scale, abmax;
    extern /* Subroutine */ int cgemv_(char *, integer *, integer *, complex *
	    , complex *, integer *, complex *, integer *, complex *, complex *
	    , integer *);
    static real anorm, bnorm, enorm;
    static char trans[1];
    static complex acoeff, bcoeff;
    extern doublereal clange_(char *, integer *, integer *, complex *, 
	    integer *, real *);
    static complex alphai;
    extern doublereal slamch_(char *);
    static real alfmax, safmin;
    static char normab[1];
    static real safmax, betmax, enrmer, errnrm, ulp;


#define e_subscr(a_1,a_2) (a_2)*e_dim1 + a_1
#define e_ref(a_1,a_2) e[e_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   
       September 30, 1994   


    Purpose   
    =======   

    CGET52  does an eigenvector check for the generalized eigenvalue   
    problem.   

    The basic test for right eigenvectors is:   

                              | b(i) A E(i) -  a(i) B E(i) |   
            RESULT(1) = max   -------------------------------   
                         i    n ulp max( |b(i) A|, |a(i) B| )   

    using the 1-norm.  Here, a(i)/b(i) = w is the i-th generalized   
    eigenvalue of A - w B, or, equivalently, b(i)/a(i) = m is the i-th   
    generalized eigenvalue of m A - B.   

                            H   H  _      _   
    For left eigenvectors, A , B , a, and b  are used.   

    CGET52 also tests the normalization of E.  Each eigenvector is   
    supposed to be normalized so that the maximum "absolute value"   
    of its elements is 1, where in this case, "absolute value"   
    of a complex value x is  |Re(x)| + |Im(x)| ; let us call this   
    maximum "absolute value" norm of a vector v  M(v).   
    if a(i)=b(i)=0, then the eigenvector is set to be the jth coordinate   
    vector. The normalization test is:   

            RESULT(2) =      max       | M(v(i)) - 1 | / ( n ulp )   
                       eigenvectors v(i)   

    Arguments   
    =========   

    LEFT    (input) LOGICAL   
            =.TRUE.:  The eigenvectors in the columns of E are assumed   
                      to be *left* eigenvectors.   
            =.FALSE.: The eigenvectors in the columns of E are assumed   
                      to be *right* eigenvectors.   

    N       (input) INTEGER   
            The size of the matrices.  If it is zero, CGET52 does   
            nothing.  It must be at least zero.   

    A       (input) COMPLEX array, dimension (LDA, N)   
            The matrix A.   

    LDA     (input) INTEGER   
            The leading dimension of A.  It must be at least 1   
            and at least N.   

    B       (input) COMPLEX array, dimension (LDB, N)   
            The matrix B.   

    LDB     (input) INTEGER   
            The leading dimension of B.  It must be at least 1   
            and at least N.   

    E       (input) COMPLEX array, dimension (LDE, N)   
            The matrix of eigenvectors.  It must be O( 1 ).   

    LDE     (input) INTEGER   
            The leading dimension of E.  It must be at least 1 and at   
            least N.   

    ALPHA   (input) COMPLEX array, dimension (N)   
            The values a(i) as described above, which, along with b(i),   
            define the generalized eigenvalues.   

    BETA    (input) COMPLEX array, dimension (N)   
            The values b(i) as described above, which, along with a(i),   
            define the generalized eigenvalues.   

    WORK    (workspace) COMPLEX array, dimension (N**2)   

    RWORK   (workspace) REAL array, dimension (N)   

    RESULT  (output) REAL array, dimension (2)   
            The values computed by the test described above.  If A E or   
            B E is likely to overflow, then RESULT(1:2) is set to   
            10 / ulp.   

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


       Parameter adjustments */
    a_dim1 = *lda;
    a_offset = 1 + a_dim1 * 1;
    a -= a_offset;
    b_dim1 = *ldb;
    b_offset = 1 + b_dim1 * 1;
    b -= b_offset;
    e_dim1 = *lde;
    e_offset = 1 + e_dim1 * 1;
    e -= e_offset;
    --alpha;
    --beta;
    --work;
    --rwork;
    --result;

    /* Function Body */
    result[1] = 0.f;
    result[2] = 0.f;
    if (*n <= 0) {
	return 0;
    }

    safmin = slamch_("Safe minimum");
    safmax = 1.f / safmin;
    ulp = slamch_("Epsilon") * slamch_("Base");

    if (*left) {
	*(unsigned char *)trans = 'C';
	*(unsigned char *)normab = 'I';
    } else {
	*(unsigned char *)trans = 'N';
	*(unsigned char *)normab = 'O';
    }

/*     Norm of A, B, and E:   

   Computing MAX */
    r__1 = clange_(normab, n, n, &a[a_offset], lda, &rwork[1]);
    anorm = dmax(r__1,safmin);
/* Computing MAX */
    r__1 = clange_(normab, n, n, &b[b_offset], ldb, &rwork[1]);
    bnorm = dmax(r__1,safmin);
/* Computing MAX */
    r__1 = clange_("O", n, n, &e[e_offset], lde, &rwork[1]);
    enorm = dmax(r__1,ulp);
    alfmax = safmax / dmax(1.f,bnorm);
    betmax = safmax / dmax(1.f,anorm);

/*     Compute error matrix.   
       Column i = ( b(i) A - a(i) B ) E(i) / max( |a(i) B| |b(i) A| ) */

    i__1 = *n;
    for (jvec = 1; jvec <= i__1; ++jvec) {
	i__2 = jvec;
	alphai.r = alpha[i__2].r, alphai.i = alpha[i__2].i;
	i__2 = jvec;
	betai.r = beta[i__2].r, betai.i = beta[i__2].i;
/* Computing MAX */
	r__5 = (r__1 = alphai.r, dabs(r__1)) + (r__2 = r_imag(&alphai), dabs(
		r__2)), r__6 = (r__3 = betai.r, dabs(r__3)) + (r__4 = r_imag(&
		betai), dabs(r__4));
	abmax = dmax(r__5,r__6);
	if ((r__1 = alphai.r, dabs(r__1)) + (r__2 = r_imag(&alphai), dabs(
		r__2)) > alfmax || (r__3 = betai.r, dabs(r__3)) + (r__4 = 
		r_imag(&betai), dabs(r__4)) > betmax || abmax < 1.f) {
	    scale = 1.f / dmax(abmax,safmin);
	    q__1.r = scale * alphai.r, q__1.i = scale * alphai.i;
	    alphai.r = q__1.r, alphai.i = q__1.i;
	    q__1.r = scale * betai.r, q__1.i = scale * betai.i;
	    betai.r = q__1.r, betai.i = q__1.i;
	}
/* Computing MAX */
	r__5 = ((r__1 = alphai.r, dabs(r__1)) + (r__2 = r_imag(&alphai), dabs(
		r__2))) * bnorm, r__6 = ((r__3 = betai.r, dabs(r__3)) + (r__4 
		= r_imag(&betai), dabs(r__4))) * anorm, r__5 = max(r__5,r__6);
	scale = 1.f / dmax(r__5,safmin);
	q__1.r = scale * betai.r, q__1.i = scale * betai.i;
	acoeff.r = q__1.r, acoeff.i = q__1.i;
	q__1.r = scale * alphai.r, q__1.i = scale * alphai.i;
	bcoeff.r = q__1.r, bcoeff.i = q__1.i;
	if (*left) {
	    r_cnjg(&q__1, &acoeff);
	    acoeff.r = q__1.r, acoeff.i = q__1.i;
	    r_cnjg(&q__1, &bcoeff);
	    bcoeff.r = q__1.r, bcoeff.i = q__1.i;
	}
	cgemv_(trans, n, n, &acoeff, &a[a_offset], lda, &e_ref(1, jvec), &
		c__1, &c_b1, &work[*n * (jvec - 1) + 1], &c__1);
	q__1.r = -bcoeff.r, q__1.i = -bcoeff.i;
	cgemv_(trans, n, n, &q__1, &b[b_offset], lda, &e_ref(1, jvec), &c__1, 
		&c_b2, &work[*n * (jvec - 1) + 1], &c__1);
/* L10: */
    }

    errnrm = clange_("One", n, n, &work[1], n, &rwork[1]) / enorm;

/*     Compute RESULT(1) */

    result[1] = errnrm / ulp;

/*     Normalization of E: */

    enrmer = 0.f;
    i__1 = *n;
    for (jvec = 1; jvec <= i__1; ++jvec) {
	temp1 = 0.f;
	i__2 = *n;
	for (j = 1; j <= i__2; ++j) {
/* Computing MAX */
	    i__3 = e_subscr(j, jvec);
	    r__3 = temp1, r__4 = (r__1 = e[i__3].r, dabs(r__1)) + (r__2 = 
		    r_imag(&e_ref(j, jvec)), dabs(r__2));
	    temp1 = dmax(r__3,r__4);
/* L20: */
	}
/* Computing MAX */
	r__1 = enrmer, r__2 = temp1 - 1.f;
	enrmer = dmax(r__1,r__2);
/* L30: */
    }

/*     Compute RESULT(2) : the normalization error in E. */

    result[2] = enrmer / ((real) (*n) * ulp);

    return 0;

/*     End of CGET52 */

} /* cget52_ */

#undef e_ref
#undef e_subscr


