#include <stdio.h>
#include <math.h>
#include <time.h>
#include <stdlib.h>

double function(double t, double k1, double phase)
    {

    double k2=10,m=1;
    double x;

    x= log(t+1)*cos(k1*k2*t+phase)*exp(-t/2);

    return x;
}

main()
    {
    srand(time(NULL));
    double time=.0001, v=1, phase,xvalue,yvalue=0, k1;
    double loop=1;
    FILE *out;
    out=fopen("simulation.csv","w");

    while (loop<5)
        {
        phase= loop*3.14/3;


        while (time<10)
            {
            yvalue=v*time;
            xvalue=function(time,v,phase);

            fprintf(out,"%e,%e\n",xvalue,-yvalue);

            time=time+.001;
        }
        loop=loop+1;

        time=.00001;
    }
}