[Numpy-discussion] How to Extract the Number of Rows and Columns in a Matrix

Derek Homeier derek@astro.physik.uni-goettingen...
Mon Mar 26 18:38:33 CDT 2012

On 27.03.2012, at 1:26AM, Olivier Delalleau wrote:

> len(M) will give you the number of rows of M.
> For columns I just use M.shape[1] myself, I don't know if there exists a shortcut.

You can use tuple unpacking, if that helps keeping your code conciser…

nrow, ncol = M.shape


> Le 26 mars 2012 19:03, Stephanie Cooke <cooke.stephanie@gmail.com> a écrit :
> Hello,
> I would like to extract the number of rows and columns of a matrix
> individually. The shape command outputs the rows and columns together,
> but are there commands that will separately give the rows and
> separately give the columns?
> Thanks

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