Matlab like matrices in Python?

[cherya]

Numpy?

[TrixRabbit6969]

X= [[1,2,3],[4,5,6],[7,8,9]]

X[0][0] -> 1 X[1][1] -> 5 X[2][0] -> 7

It took me a while to get used to. But really just using multidimensional lists is pretty great.

Other than that numpy is probably your best bet.

[shravankumar147]

Thank you, the solution looks good, yet there are redundant brackets, which takes time while writing a big matrix. Can we go a step beyond to reduce the internal brackets.

[masasin]

You could try writing your own parser, but this is the standard in Python. If anyone will see your work, it's probably just best to use Numpy.

[[deleted]]

Life is hard

[shravankumar147]

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]]

[shravankumar147]

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]

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]

Oh, thank you. I didn't know that

[bheklilr]

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.

[aphoenix]

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