How can I fill the 2d array in clojure with loop like matrix that we do in JAVA if I have a list of the characters

Question

I want to fill 2d array in clojure like we do in java

I have provided the example of java. I want to do like this in Clojure

Scanner sc=new Scanner(System.in);
Scanner sc1=new Scanner(System.in);
int row=sc.nextInt();
int col=sc.nextInt();
realMatrix=new String[row][col];
String[] in=new String[row];
for(int k=0;k<row;k++) {
    in[k]=sc1.nextLine();
}
for(int i=0;i<row;i++) {
    char[] charArry=in[i].toCharArray();
    for(int j=0;j<col;j++) {
        realMatrix[i][j]=Character.toString(charArry[j]);
    }
}

Answer 1

If your input (lines) is valid (it contains the correct number of rows and each row contains the correct number of characters), it can be parsed with

(vec (map #(clojure.string/split % #"") (drop 2 lines)))

If your input looks like lines below, you'll want to filter out the !s:

(def lines
  ["3"
   "5"
   "abcde!!!"
   "FGHIJ!!!"
   "klmno!!!"
   "!!!!!!!!"
   "!!!!!!!!"])

(defn split-row [row n-cols]
  (vec (take n-cols (clojure.string/split row #""))))

(defn parse-matrix [lines]
  (let [n-rows (Integer. (first lines))
        n-cols (Integer. (second lines))
        matrix-lines (take n-rows (drop 2 lines))]
    (vec (map #(split-row % n-cols) matrix-lines))))

If you really want to parse it as it is read from standard input:

(defn parse-matrix-stdin []
  (let [n-rows (Integer. (read-line))
        n-cols (Integer. (read-line))
        matrix-lines (take n-rows (repeatedly read-line))]
    (vec (map #(split-row % n-cols) matrix-lines))))