* A simple matrix ADT.
* Last updated 7/31/2021.
package edu.ser222.m01_02;
public interface Matrix {
* Returns the element at particular point in the matrix.
* @param y y position
* @param x x position
* @return element
public int getElement(int y, int x);
* Returns the number of rows in the matrix.
* @return rows
public int getRows();
* Returns the number of columns in the matrix.
* @return columns
public int getColumns();
* Returns this matrix scaled by a factor. That is, computes kA where k is a
* constant and A is a matrix (this object).
* @param scalar scalar
* @return matrix
public Matrix scale(int scalar);
* Returns this matrix added with another matrix. That is, computes A+B
* where A and B are matrices (this object, and another respectively).
* @param other addend
* @return matrix
* @throws RuntimeException if matrices do not have matching dimensions.
* @throws IllegalArgumentException if other matrix is null.
public Matrix plus(Matrix other);
* Returns this matrix subtracted by another matrix. That is, computes A-B
* where A and B are matrices (this object, and another respectively).
* @param other subtrahend
* @return matrix
* @throws RuntimeException if matrices do not have matching dimensions.
* @throws IllegalArgumentException if other matrix is null.
public Matrix minus(Matrix other);
* Returns this matrix multiplied by another matrix (using dot products).
* That is, computes AB where A and B are matrices (this object, and another
* respectively).
* @param other multiplicand
* @return matrix
* @throws RuntimeException if matrices do not have appropriate dimensions.
* @throws IllegalArgumentException if other matrix is null.
public Matrix multiply(Matrix other);
* Returns true if this matrix matches another matrix.
* @param other another matrix
* @return equality
public boolean equals(Object other);
* Returns a string representation of this matrix. A new line character will
* separate each row, while a space will separate each column.
* @return string representation
public String toString();