check matrix sum

lib/matrix_check_sum.rb

@@ -3,5 +3,35 @@
 # of numbers in row i is the same as the sum of numbers in column i for i = 0 to row.length-1
 # If this is the case, return true. Otherwise, return false.
 def matrix_check_sum(matrix)
+  # We are assuming all in coming matrices are square.
+  # Matrix.length is the number of rows in the matrix.
+  # Set index = 0, sum at row 0 and column 0
+  # row = matrix[0][0] + matrix [0][1] + matrix[0][2] + matrix[0][3]
+  # column = matrix[0][0] + matrix[1][0] + matrix[2][0] + matrix[3][0]
+  row_col_index = 0
+  row_sum = 0
+  column_sum = 0
+  while row_col_index < matrix.length do
+
+    # Add row
+    # Add column
+    index = 0
+    while index < matrix.length do
+      row_sum += matrix[row_col_index][index]
+      column_sum += matrix[index][row_col_index]
+      index += 1
+    end
+    # If the sum row == sum column, iterate row_col_index
+    if row_sum == column_sum
+      row_col_index += 1
+    # else sum row == sum column return false
+    else
+      return false
+    # end
+    end
+    # return true (iterated through entire matrix with corresponding rows and columns equal to eachother)
+
+  end
+  return true
   raise NotImplementedError
 end