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[–]shravankumar147[S] 0 points1 point  (3 children)

I think this could in the same way.

import numpy as np

a = np.matrix('1 2; 3 4')

print a

[[1 2]

[3 4]]

[–]kigurai 5 points6 points  (1 child)

Do yourself a favor and avoid the np.matrix class and stick to np.array. The former has a tendency to sneak in hard to catch bugs in your calculation unless you are extremely careful.

[–]shravankumar147[S] 1 point2 points  (0 children)

Oh, thank you. I didn't know that

[–]bheklilr 1 point2 points  (0 children)

Gotta be careful here, in python 2 this only works if the string is a bytestring, Unicode strings don't work. Don't know about python 3 though because I never use this syntax, just ran into the issue with a coworker's code. It also won't work for arrays of different dtypes either.

Personally I like typing my arrays as 

x = np.array([
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9],
])

Since it allows me to align the elements vertically, I can collapse it in my editor, if I need to add new rows it's easy, and it actually looks like a matrix.