ezincarg.c

国外一大学教授讲章

#include "ezincarg.h"     

/* global variables -- but private to this file */
static double delay, width, cdtds;  
static int initDone=0; 

/* initialize source-function parameters */
void ezIncArgInit(double the_cdtds, double the_delay, double the_width){ 
  cdtds = the_cdtds;   
  delay = the_delay;
  width = the_width;   
  initDone = 1;        
  return;
}

/* calculate source function at given time and location */
double ezInc(double time, double location) {  
  if (!initDone) {
    fprintf(stderr,
       "ezInc: must call ezIncArgInit before ezInc.\n");
    exit(-1);
  }
  return exp( -pow( (time - delay - location/cdtds)/width, 2) );
}