mndscal.cxx

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// @(#)root/minuit2:$Id: mndscal.cxx 20880 2007-11-19 11:23:41Z rdm $
// Authors: M. Winkler, F. James, L. Moneta, A. Zsenei   2003-2005  

/**********************************************************************
 *                                                                    *
 * Copyright (c) 2005 LCG ROOT Math team,  CERN/PH-SFT                *
 *                                                                    *
 **********************************************************************/

/* dscal.f -- translated by f2c (version 20010320).
   You must link the resulting object file with the libraries:
        -lf2c -lm   (in that order)
*/

namespace ROOT {

   namespace Minuit2 {


int Mndscal(unsigned int n, double da, double* dx, int incx) {
   /* System generated locals */
   int i__1, i__2;
   
   /* Local variables */
   int i__, m, nincx, mp1;
   
   
   /*     scales a vector by a constant. */
   /*     uses unrolled loops for increment equal to one. */
   /*     jack dongarra, linpack, 3/11/78. */
   /*     modified 3/93 to return if incx .le. 0. */
   /*     modified 12/3/93, array(1) declarations changed to array(*) */
   
   
   /* Parameter adjustments */
   --dx;
   
   /* Function Body */
   if (n <= 0 || incx <= 0) {
      return 0;
   }
   if (incx == 1) {
      goto L20;
   }
   
   /*        code for increment not equal to 1 */
   
   nincx = n * incx;
   i__1 = nincx;
   i__2 = incx;
   for (i__ = 1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) {
      dx[i__] = da * dx[i__];
      /* L10: */
   }
   return 0;
   
   /*        code for increment equal to 1 */
   
   
   /*        clean-up loop */
   
L20:
      m = n % 5;
   if (m == 0) {
      goto L40;
   }
   i__2 = m;
   for (i__ = 1; i__ <= i__2; ++i__) {
      dx[i__] = da * dx[i__];
      /* L30: */
   }
   if (n < 5) {
      return 0;
   }
L40:
      mp1 = m + 1;
   i__2 = n;
   for (i__ = mp1; i__ <= i__2; i__ += 5) {
      dx[i__] = da * dx[i__];
      dx[i__ + 1] = da * dx[i__ + 1];
      dx[i__ + 2] = da * dx[i__ + 2];
      dx[i__ + 3] = da * dx[i__ + 3];
      dx[i__ + 4] = da * dx[i__ + 4];
      /* L50: */
   }
   return 0;
} /* dscal_ */

   }  // namespace Minuit2

}  // namespace ROOT

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