#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"

doublereal ssxt1_(integer *ijob, real *d1, integer *n1, real *d2, integer *n2,
	 real *abstol, real *ulp, real *unfl)
{
    /* System generated locals */
    integer i__1;
    real ret_val, r__1, r__2, r__3, r__4;

    /* Local variables */
    static real temp1, temp2;
    static integer i__, j;


/*  -- LAPACK test routine (version 3.0) --   
       Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,   
       Courant Institute, Argonne National Lab, and Rice University   
       February 29, 1992   


    Purpose   
    =======   

    SSXT1  computes the difference between a set of eigenvalues.   
    The result is returned as the function value.   

    IJOB = 1:   Computes   max { min | D1(i)-D2(j) | }   
                            i     j   

    IJOB = 2:   Computes   max { min | D1(i)-D2(j) | /   
                            i     j   
                                 ( ABSTOL + |D1(i)|*ULP ) }   

    Arguments   
    =========   

    ITYPE   (input) INTEGER   
            Specifies the type of tests to be performed.  (See above.)   

    D1      (input) REAL array, dimension (N1)   
            The first array.  D1 should be in increasing order, i.e.,   
            D1(j) <= D1(j+1).   

    N1      (input) INTEGER   
            The length of D1.   

    D2      (input) REAL array, dimension (N2)   
            The second array.  D2 should be in increasing order, i.e.,   
            D2(j) <= D2(j+1).   

    N2      (input) INTEGER   
            The length of D2.   

    ABSTOL  (input) REAL   
            The absolute tolerance, used as a measure of the error.   

    ULP     (input) REAL   
            Machine precision.   

    UNFL    (input) REAL   
            The smallest positive number whose reciprocal does not   
            overflow.   

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


       Parameter adjustments */
    --d2;
    --d1;

    /* Function Body */
    temp1 = 0.f;

    j = 1;
    i__1 = *n1;
    for (i__ = 1; i__ <= i__1; ++i__) {
L10:
	if (d2[j] < d1[i__] && j < *n2) {
	    ++j;
	    goto L10;
	}
	if (j == 1) {
	    temp2 = (r__1 = d2[j] - d1[i__], dabs(r__1));
	    if (*ijob == 2) {
/* Computing MAX */
		r__2 = *unfl, r__3 = *abstol + *ulp * (r__1 = d1[i__], dabs(
			r__1));
		temp2 /= dmax(r__2,r__3);
	    }
	} else {
/* Computing MIN */
	    r__3 = (r__1 = d2[j] - d1[i__], dabs(r__1)), r__4 = (r__2 = d1[
		    i__] - d2[j - 1], dabs(r__2));
	    temp2 = dmin(r__3,r__4);
	    if (*ijob == 2) {
/* Computing MAX */
		r__2 = *unfl, r__3 = *abstol + *ulp * (r__1 = d1[i__], dabs(
			r__1));
		temp2 /= dmax(r__2,r__3);
	    }
	}
	temp1 = dmax(temp1,temp2);
/* L20: */
    }

    ret_val = temp1;
    return ret_val;

/*     End of SSXT1 */

} /* ssxt1_ */


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