kusano 7d535a
kusano 7d535a
/*  -- translated by f2c (version 19940927).
kusano 7d535a
   You must link the resulting object file with the libraries:
kusano 7d535a
	-lf2c -lm   (in that order)
kusano 7d535a
*/
kusano 7d535a
kusano 7d535a
#include "f2c.h"
kusano 7d535a
kusano 7d535a
doublereal ddot_(integer *n, doublereal *dx, integer *incx, doublereal *dy, 
kusano 7d535a
	integer *incy)
kusano 7d535a
{
kusano 7d535a
kusano 7d535a
kusano 7d535a
    /* System generated locals */
kusano 7d535a
    integer i__1;
kusano 7d535a
    doublereal ret_val;
kusano 7d535a
kusano 7d535a
    /* Local variables */
kusano 7d535a
    static integer i, m;
kusano 7d535a
    static doublereal dtemp;
kusano 7d535a
    static integer ix, iy, mp1;
kusano 7d535a
kusano 7d535a
kusano 7d535a
/*     forms the dot product of two vectors.   
kusano 7d535a
       uses unrolled loops for increments equal to one.   
kusano 7d535a
       jack dongarra, linpack, 3/11/78.   
kusano 7d535a
       modified 12/3/93, array(1) declarations changed to array(*)   
kusano 7d535a
kusano 7d535a
kusano 7d535a
    
kusano 7d535a
   Parameter adjustments   
kusano 7d535a
       Function Body */
kusano 7d535a
#define DY(I) dy[(I)-1]
kusano 7d535a
#define DX(I) dx[(I)-1]
kusano 7d535a
kusano 7d535a
kusano 7d535a
    ret_val = 0.;
kusano 7d535a
    dtemp = 0.;
kusano 7d535a
    if (*n <= 0) {
kusano 7d535a
	return ret_val;
kusano 7d535a
    }
kusano 7d535a
    if (*incx == 1 && *incy == 1) {
kusano 7d535a
	goto L20;
kusano 7d535a
    }
kusano 7d535a
kusano 7d535a
/*        code for unequal increments or equal increments   
kusano 7d535a
            not equal to 1 */
kusano 7d535a
kusano 7d535a
    ix = 1;
kusano 7d535a
    iy = 1;
kusano 7d535a
    if (*incx < 0) {
kusano 7d535a
	ix = (-(*n) + 1) * *incx + 1;
kusano 7d535a
    }
kusano 7d535a
    if (*incy < 0) {
kusano 7d535a
	iy = (-(*n) + 1) * *incy + 1;
kusano 7d535a
    }
kusano 7d535a
    i__1 = *n;
kusano 7d535a
    for (i = 1; i <= *n; ++i) {
kusano 7d535a
	dtemp += DX(ix) * DY(iy);
kusano 7d535a
	ix += *incx;
kusano 7d535a
	iy += *incy;
kusano 7d535a
/* L10: */
kusano 7d535a
    }
kusano 7d535a
    ret_val = dtemp;
kusano 7d535a
    return ret_val;
kusano 7d535a
kusano 7d535a
/*        code for both increments equal to 1   
kusano 7d535a
kusano 7d535a
kusano 7d535a
          clean-up loop */
kusano 7d535a
kusano 7d535a
L20:
kusano 7d535a
    m = *n % 5;
kusano 7d535a
    if (m == 0) {
kusano 7d535a
	goto L40;
kusano 7d535a
    }
kusano 7d535a
    i__1 = m;
kusano 7d535a
    for (i = 1; i <= m; ++i) {
kusano 7d535a
	dtemp += DX(i) * DY(i);
kusano 7d535a
/* L30: */
kusano 7d535a
    }
kusano 7d535a
    if (*n < 5) {
kusano 7d535a
	goto L60;
kusano 7d535a
    }
kusano 7d535a
L40:
kusano 7d535a
    mp1 = m + 1;
kusano 7d535a
    i__1 = *n;
kusano 7d535a
    for (i = mp1; i <= *n; i += 5) {
kusano 7d535a
	dtemp = dtemp + DX(i) * DY(i) + DX(i + 1) * DY(i + 1) + DX(i + 2) * 
kusano 7d535a
		DY(i + 2) + DX(i + 3) * DY(i + 3) + DX(i + 4) * DY(i + 4);
kusano 7d535a
/* L50: */
kusano 7d535a
    }
kusano 7d535a
L60:
kusano 7d535a
    ret_val = dtemp;
kusano 7d535a
    return ret_val;
kusano 7d535a
} /* ddot_ */
kusano 7d535a