matgen.c

来自「数值算法库」· C语言 代码 · 共 28 行

/*  matgen.c    CCM mathematics library source code.
 *
 *  Copyright (C)  2000   Daniel A. Atkinson    All rights reserved.
 *  This code may be redistributed under the terms of the GNU general
 *  public license. ( See the gpl.license file for details.)
 * ------------------------------------------------------------------------
 */
#include <stdio.h>
#include <time.h>
#include "ccmath.h"
main(na,av)
int na; char **av;
{ double *a,*p,nrml();
  int n,m,j; unsigned long seed;
  FILE *fp;
  if(na!=3){ printf("para: dim o_file\n"); exit(1);}
  n=atoi(*++av); m=n*n;
  fp=fopen(*++av,"wb");
  a=(double *)calloc(m,sizeof(double));
  seed=(unsigned long)time(NULL); setnrml(seed);
  for(j=0,p=a; j<m ;++j) *p++ =nrml();
  fwrite((void *)&n,sizeof(int),1,fp);
  fwrite((void *)a,sizeof(double),m,fp);
}