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Prim - A Java Primitives Library.

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package edu.jhu.prim.matrix;

import edu.jhu.prim.map.IntDoubleEntry;

public class TransposeView implements DoubleMatrix {

    private static final long serialVersionUID = -3478557435074039018L;
    private DoubleMatrix mat;
    
    public TransposeView(DoubleMatrix matrix) {
        this.mat = matrix;
    }

    @Override
    public int getNumRows() {
        return mat.getNumColumns();
    }

    @Override
    public int getNumColumns() {
        return mat.getNumRows();
    }

    @Override
    public double get(int row, int col) {
        return mat.get(col, row);
    }

    @Override
    public void set(int row, int col, double value) {
        mat.set(col, row, value);
    }

    @Override
    public void decrement(int row, int col, double decr) {
        mat.decrement(col, row, decr);
    }

    @Override
    public void increment(int row, int col, double incr) {
        mat.increment(col, row, incr);            
    }

    @Override
    public void set(DoubleMatrix other) {
        if (other instanceof DenseDoubleMatrix) {
            DenseDoubleMatrix dim = (DenseDoubleMatrix)other;
            int numCols = mat.getNumColumns();
            assert(numCols == dim.numRows);
            int numRows = mat.getNumRows();
            assert(numRows == dim.numCols);
            for (int row=0; row getRowEntries(int row) {
        throw new RuntimeException();
    }

    @Override
    public DoubleMatrix viewTranspose() {
        return mat;
    }
    
}