rows = eval(input("enter the number of rows:"))
columns = eval(input("enter the numbers of columns:"))

matrix = []                                         
matrix2 = []
matrix3 = []

for i in range(0, rows):                            
   matrix.append([])
   for j in range (0,columns):
       val = eval(input("Enter a number:"))        
       matrix[i].append(val)                       
print(matrix)
for i in range(0, rows):                            
   matrix2.append([])
   for j in range (0,columns):
       val2 = eval(input("Enter a number:"))        
       matrix2[i].append(val2)
print(matrix2)



for i in range(0, rows):
 if i % 2 == 0:
   matrix3.append([])
   for j in range (0,columns):
       val3 = matrix[i][j]   matrix2[i][j]
       matrix3[i].append(val3)
print(matrix3)

I am stuck regarding finding out how to only add the even numbers into matrix 3. Was trying to use a basic function if % 2 == 0 which would tell me the even numbers but do not know where to go after that.

CodePudding user response：

You're testing the row numbers for evenness, not the numbers in the matrixes.

for row1, row2 in zip(matrix, matrix2):
    new_row = []
    for num1, num2 in zip(row1, row2):
        new_num = 0
        if num1 % 2 == 0:
            new_num  = num1
        if num2 % 2 == 0:
            new_num  = num2
        new_row.append(new_num)
    matrix2.append(new_row)