function makeMatrix(columns, rows) {
    const matrix = [];
    for (let i = 0; i < columns; i++) {
        const column = [];
        for (let j = 0; j < rows; j++) {
            column.push(0);
        }
        matrix.push(column);
    }
    return matrix;
}
Create a new column x row matrix.

@private
@param {number} columns
@param {number} rows
@return {Array<Array<number>>} matrix
@example
makeMatrix(10, 10);