CODEWITHSUNDEEP
javaarraysmatrix
Devz
Devz

Reputation: 5

Upper Triangular Matrix in Java

I have a query which generates the following result set 

rs = [51,88,93,89,91,26,51,47,47,31,67,68,46,92,39]

my matrix size is 5X5 and I want the final result as upper triangular matrix

51  88  93  89  91

0   26  51  47  47

0   0   31  67  68

0   0   0   46  92

0   0   0   0   39

My code : But does not generate the desired O/P

int rowCount = 5;
String[][] result = new String[rowCount][];
for (int i = 0; i < rowCount; i++) {
    Cell[] row = sheet.getRow(i);

    result[i] = new String[row.length];
    for (int j = 0; j < row.length; j++) {
        if(i<=j){
            result[i][j] = row[j].getContents();
            System.out.print(result[i][j] + " ");
        }else{
            result[i][j] = "0";
            System.out.print(result[i][j] + " ");
        }
    }
    System.out.print("\n");
}

Can you please help what to change in the code to get the proper matrix.

Upvotes: 0

Views: 3087

Answers (1)

AGV
AGV

Reputation: 414

0's are in the cells where column number is lesser then row number.

int rowCount = 5;
int colCount = rowCount;
int[][] result = new int[rowCount][colCount];
int[] input = { 51, 88, 93, 89, 91, 26, 51, 47, 47, 31, 67, 68, 46, 92, 39};
int k = 0;
for (int row = 0; row < rowCount; row++) {
  for (int column = 0; column < colCount; column++) {
    result[row][column] = row > column ? 0 : input[k++];
  }
}

Upvotes: 1

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