experiments

All kinds of coding experiments
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printplot.cpp (1638B)

      1 #include <iostream>
      2 #include <string>
      3 #include <math.h>
      4 #define PI2 6.28318530718
      5 
      6 using namespace std;
      7 void pp(double* signal, int N, int M)
      8 {
      9     // N is signal length. M is sample resolution.
     10     double threshold[M-1];
     11     double sampled[N];
     12     // If M is odd:
     13     if(M % 2){
     14     
     15     }
     16     // If M is even:
     17     else {
     18         for(int l = 0; l < M-1; l++)
     19             threshold[l] = double(2*l - (M - 2)) / M;
     20     }
     21 
     22     // height is the resolution (in characters of each sample)
     23     // width is the number of samples
     24     for(int n = 0; n < N; n++) {
     25         for(int l = 0; l < M-1; l++){
     26             if(signal[n] < threshold[l] ){
     27                 sampled[n] = l;
     28                 break;
     29             }
     30             if(l == M-2){
     31                 sampled[n] = M;
     32                 break;
     33             }
     34         }
     35     }
     36     // Plot:
     37     for(int m = M; m > 0; m--) {
     38         // Evaluated each character
     39         for(int n = 0; n < N; n++)
     40         {
     41             if(sampled[n] == m && n > 1){
     42                 if(sampled[n] < sampled[n-1] && sampled[n-1] < sampled[n-2])
     43                     cout << "\\";
     44                 else if(sampled[n] > sampled[n-1] && sampled[n-1] > sampled[n-2])
     45                     cout << "/";
     46                 else
     47                     cout << "-";
     48             }
     49             else
     50                 cout << " ";
     51         }
     52         cout << endl;
     53     }
     54 }
     55 
     56 int main()
     57 {
     58     double freq;
     59     int N = 100;
     60     double signal[N];
     61 
     62     // Create a sin to use as example
     63     cout << "Frequency: ";
     64     cin >> freq;
     65     for(int n = 0; n < N; n++) {
     66         signal[n] = sin(PI2*freq*n/N); 
     67     }
     68     pp(signal, N, 30);
     69 
     70     return 0;
     71 }
     72