What is the equivalent of MATLAB's repmat in NumPy

python matlab numpy
vernomcrp picture vernomcrp · Nov 12, 2009 · Viewed 86.2k times · Source

I would like to execute the equivalent of the following MATLAB code using NumPy: repmat([1; 1], [1 1 1]). How would I accomplish this?

Answer

robince picture robince · Nov 12, 2009

Here is a much better (official) NumPy for Matlab Users link - I'm afraid the mathesaurus one is quite out of date.

The numpy equivalent of repmat(a, m, n) is tile(a, (m, n)).

This works with multiple dimensions and gives a similar result to matlab. (Numpy gives a 3d output array as you would expect - matlab for some reason gives 2d output - but the content is the same).

Matlab:

>> repmat([1;1],[1,1,1])

ans =
     1
     1

Python:

In [46]: a = np.array([[1],[1]])
In [47]: np.tile(a, [1,1,1])
Out[47]: 
array([[[1],
        [1]]])

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