Custom Matrix Formatting

Example: Matrix Formatting

A matrix is printed in CSV (comma separated value) format. This is done by overriding the format method of PrintMatrixFormat to add commas after all but the last number in each row.


import com.imsl.math.*;
import java.text.*;

public class PrintMatrixFormatEx2 extends PrintMatrixFormat {

    private int ncols;

    public PrintMatrixFormatEx2(int ncols) {
        this.ncols = ncols;
    }

    public String format(int type, Object entry,
            int row, int col, ParsePosition pos) {
        String text = super.format(type, entry, row, col, pos);
        if (type == ENTRY) {
            if (col < ncols - 1) {
                text += ",";
            }
        }
        return text;
    }

    public static void main(String args[]) {
        double a[][] = {
            {0., 1., 2.},
            {4., 5., 6.},
            {8., 9., 8.},
            {6., 3., 4.}
        };

        PrintMatrixFormat mf = new PrintMatrixFormatEx2(3);
        mf.setNoRowLabels();
        mf.setNoColumnLabels();

        //	Print the matrix
        new PrintMatrix().print(mf, a);
    }
}

Output

Link to Java source.