# Ruby program to calculate the sum of columns of matrix elements

Ruby Example: Write a program to calculate the sum of columns of matrix elements.
Submitted by Nidhi, on January 23, 2022

Problem Solution:

In this program, we will create a matrix using the 2D array. Then we read elements of the matrix from the user. After that, we will calculate the sum of columns of matrix elements and print the result.

Program/Source Code:

The source code to calculate the sum of columns of matrix elements is given below. The given program is compiled and executed successfully.

```# Ruby program to calculate the sum of columns
# of matrix elements

TwoDArr = Array.new(2){Array.new(2)}
sum = 0;

printf "Enter elements of MATRIX:\n";
i = 0;
while (i < 2)
j = 0;
while (j < 2)
printf "ELEMENT [%d][%d]: ", i, j;
TwoDArr[i][j] =  gets.chomp.to_i;
j = j + 1;
end
i = i + 1;
end

printf "MATRIX:\n";
i = 0;
while (i < 2)
j = 0;
while (j < 2)
print TwoDArr[i][j]," ";
j = j + 1;
end
i = i + 1;
print "\n";
end

i=0;
j=0;
while (i < 2)
j = 0;
sum = 0;
while (j < 2)
sum = sum + TwoDArr[j][i];
j = j + 1;
end
printf "Sum of column(%d): %d\n", i, sum;
i = i + 1;
end
```

Output:

```Enter elements of MATRIX:
ELEMENT [0][0]: 1
ELEMENT [0][1]: 2
ELEMENT [1][0]: 3
ELEMENT [1][1]: 4
MATRIX:
1 2
Sum of column(0): 4
Sum of column(1): 6
```

Explanation:

In the above program, we created a 2X2 matrix TwoDArr using the 2D array. Then we read the elements of the matrix. After that, we calculated the sum of columns of matrix elements and printed the result.

Preparation

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