utils

Utility

parse_arg

• using getopt to create object, more efficient to use arguments.

• example code usage:

#include "parse_arg.h"
...

int main(int argc,char **argv){
...
// create parsing args object
parse_args *args = new parse_args();
// set rules 
args->set_args_rules("v","version","0.0.1","string");
args->set_args_rules("l","lambda","1","int");
args->set_args_rules("k","execution times","5","int");
// parse it!
args->parsing(argc,argv);
// print out 
printf("%s\n",args->get_args_val("v").val.c_str());
printf("%d\n",std::atoi(args->get_args_val("l").val.c_str()));
printf("%s\n",args->get_args_val("k").val.c_str());
...

• and corresponded output

# without any parameters (default state)
$ ./a.out
0.0.1
1
5

# with specified parameters
$ ./a.out -v 0.0.2 -l 10 -k 10000
0.0.2
10
10000

event

• Provide class event for discrete event utility.

• Workflow:

rand_gen

• provide random variable generation.

poisson

• Generate the Poisson probability : $$p(i) = P{X=n} = \frac{e^{-\lambda}}{n!} \cdot \lambda^n, \ \ \ n=0,1, ...$$

• usage:

  • $$poisson(\lambda,k)$$
  • which k represent as X's value, e.g. P{X=k}