removeRow(index) {
            util.checkRowIndex(this, index);
            if (this.rows === 1) {
                throw new RangeError('A matrix cannot have less than one row');
            }
            this.splice(index, 1);
            this.rows -= 1;
            return this;
        }
Removes a row from the given index
@param {number} index - Row index
@return {Matrix} this