CODEWITHSUNDEEP
python-3.xnumpy
Baran Aldemir
Baran Aldemir

Reputation: 71

Can anyone explain why I can't concatenate these two matrices?

Here is my matrices and codeline:

d = np.array([[1,2,3],[6,7,8],[11,12,13],
       [16,17,18]])
e = np.array([[ 4,  5],[ 9, 10],[14, 15],[19, 20]])
np.concatenate(d,e)

and this is the error that I get:

TypeError: only integer scalar arrays can be converted to a scalar index

Upvotes: 0

Views: 34

Answers (2)

Leo Arad
Leo Arad

Reputation: 4472

Since those arrays have different dimensions you should specify the axis concatenate you what like the follow: 1) np.concatenate((d,e), axis=1)

array([[ 1,  2,  3,  4,  5],
       [ 6,  7,  8,  9, 10],
       [11, 12, 13, 14, 15],
       [16, 17, 18, 19, 20]])

or 2)np.concatenate((d,e), axis=None)

array([ 1,  2,  3,  6,  7,  8, 11, 12, 13, 16, 17, 18,  4,  5,  9, 10, 14,
       15, 19, 20])

Upvotes: 0

Xander Bielby
Xander Bielby

Reputation: 181

You have a syntax mistake in np.concatenate(d,e), the syntax requires d and e to be in a tuple, like: np.concatenate((d,e)). I tested it, and axis=1 is also required for it to work.

np.concatenate((d, e), axis=1)

is the solution

Upvotes: 1

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