Example 4: Combined Example

In this example, the getPermutations() and getSampleIndices() methods are used to sample ten values from a hypothetical vector of 1,000,000 values.

import com.imsl.stat.*;
import com.imsl.math.PrintMatrix;

public class RandomSamplesEx4 {

    public static void main(String[] args) {
        int nsamp = 10;
        int xlength = 1000000;

        RandomSamples rs = new RandomSamples();
        Random r = new Random(123457L);
        r.setMultiplier(16807);
        rs.setRandomObject(r);
        int[] idx = rs.getSampleIndices(nsamp, xlength);
        int[] perm = rs.getPermutation(nsamp);

        int[] samp = new int[nsamp];
        for (int i = 0; i < nsamp; i++) {
            samp[i] = idx[perm[i] - 1];
        }

        PrintMatrix pm = new PrintMatrix("Random Sample");
        pm.print(samp);
    }
}

Output

Random Sample
      0     
0  434,660  
1  580,208  
2  514,608  
3  908,824  
4  376,662  
5  300,775  
6  330,074  
7   36,541  
8  439,379  
9  957,579