Answer
code
Work Step by Step
# 11.1 (Sum elements column by column) Write a function that returns the sum of all the
# elements in a specified column in a matrix using the following header:
# def sumColumn(m, columnIndex):
# Write a test program that reads a 3*4 matrix and displays the sum of each column.
def sumColumn(m, columnIndex):
sum = 0
for row in range(len(m)):
sum += m[row][columnIndex]
return sum
m = []
for i in range(3):
row = input("Enter a 3-by-4 matrix row for row " + str(i)+": ").split()
m.append([float(x) for x in row])
for i in range(4):
s = sumColumn(m, i)
print("Sum of the elements for column", i, 'is', s)
