I want to convert variables created by range into matrices.

If you are using range to create a list with consecutive numbers, you can use the following methods:

list(range(5))

If the purpose is not a list but a numpy matrix,

import numpy
numpy.array(range(5))

and so on.

Additional information: November 26, 2017

 A = [ ]
idx = 0
while idx <4:
    A.append(idx+1)
    idx+=1
print(A)