4. Given a matrix D(4,4) of real numbers. How to replace all elements below the main diagonal with zeros?

Question

Python

wrote the code for this task, but the teacher said that this task can be completed without the if condition, immediately in those cycles that set the matrix. How to do it?

import random
n=4

a=[]
for i in range (n):
  b=[]
  for j in range (n):
    if i>j:
      b.append(0)
    else:
           b.append(random.randint(-100,100))
  a.append(b)
for i in a:
  for m in i:
    print(m, end=' ')
  print()

Answer 1

if(i<j)