[SciPy-Dev] [Wiki] NumPy / Matlab-Cheatsheet

Todd toddrjen at gmail.com
Tue Nov 25 04:30:07 EST 2014


On Nov 25, 2014 9:30 AM, "Michael Käppler" <xmichael-k at web.de> wrote:
>
> Hi guys,
> thanks for this great cheatsheet you provided on
> wiki.scipy.org/NumPy_for_Matlab_Users.
> I'm not allowed to edit the wiki, so I would like to propose an addition
> regarding different array shaping conventions: Consider f.e. a Matlab
> zeros(1, 4).
> If I'm right, this results in a [0 0 0 0] or in something that Matlab
> treats like a 1D-Array if it makes sense. You can f.e. do
> diag(ones(1, 4)) and you get a matrix.
> However, NumPy zeros((1,4)) results in [[0 0 0 0]], which is 2D and if you
> try to do diag(ones((1,4))) you will get [1], which is obviously different
> behaviour compared to Matlab.
> NumPy zeros(4) yields [0 0 0 0] which seems to me is the correct
> equivalent. Other Matlab commands that use this array shaping syntax are
> also affected in the same way.
> I recently ran into this issue while porting some Matlab code to NumPy.
>
> Have a nice week,
> Michael

Is this something that might be moved to github so it would be easier to
submit changes?
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