/*  -- translated by f2c (version 19940927).

   You must link the resulting object file with the libraries:

	-lf2c -lm   (in that order)

*/

#include "f2c.h"

doublereal ddot_(integer *n, doublereal *dx, integer *incx, doublereal *dy, 

	integer *incy)

{

    /* System generated locals */

    integer i__1;

    doublereal ret_val;

    /* Local variables */

    static integer i, m;

    static doublereal dtemp;

    static integer ix, iy, mp1;

/*     forms the dot product of two vectors.   

       uses unrolled loops for increments equal to one.   

       jack dongarra, linpack, 3/11/78.   

       modified 12/3/93, array(1) declarations changed to array(*)   

   Parameter adjustments   

       Function Body */

#define DY(I) dy[(I)-1]

#define DX(I) dx[(I)-1]

    ret_val = 0.;

    dtemp = 0.;

    if (*n <= 0) {

	return ret_val;

    }

    if (*incx == 1 && *incy == 1) {

	goto L20;

    }

/*        code for unequal increments or equal increments   

            not equal to 1 */

    ix = 1;

    iy = 1;

    if (*incx < 0) {

	ix = (-(*n) + 1) * *incx + 1;

    }

    if (*incy < 0) {

	iy = (-(*n) + 1) * *incy + 1;

    }

    i__1 = *n;

    for (i = 1; i <= *n; ++i) {

	dtemp += DX(ix) * DY(iy);

	ix += *incx;

	iy += *incy;

/* L10: */

    }

    ret_val = dtemp;

    return ret_val;

/*        code for both increments equal to 1   

          clean-up loop */

L20:

    m = *n % 5;

    if (m == 0) {

	goto L40;

    }

    i__1 = m;

    for (i = 1; i <= m; ++i) {

	dtemp += DX(i) * DY(i);

/* L30: */

    }

    if (*n < 5) {

	goto L60;

    }

L40:

    mp1 = m + 1;

    i__1 = *n;

    for (i = mp1; i <= *n; i += 5) {

	dtemp = dtemp + DX(i) * DY(i) + DX(i + 1) * DY(i + 1) + DX(i + 2) * 

		DY(i + 2) + DX(i + 3) * DY(i + 3) + DX(i + 4) * DY(i + 4);

/* L50: */

    }

L60:

    ret_val = dtemp;

    return ret_val;

} /* ddot_ */