setColumn(index, array) {
                util.checkColumnIndex(this, index);
                array = util.checkColumnVector(this, array);
                for (var i = 0; i < this.rows; i++) {
                    this.set(i, index, array[i]);
                }
                return this;
            }
Sets a column at the given index
@param {number} index - Column index
@param {Array|Matrix} array - Array or vector
@return {Matrix} this