[Numpy-discussion] Count the occurrence of a certain integer in a list of integers

Nils Wagner nwagner@iam.uni-stuttgart...
Tue Aug 7 07:02:16 CDT 2007


Hi all,

I have a list of integer numbers. The entries can vary between 0 and 19.
How can I count the occurrence of any number. Consider

 >>> data
[9, 6, 9, 6, 7, 9, 9, 10, 7, 9, 9, 6, 7, 9, 8, 8, 11, 9, 6, 7, 10, 9, 7, 9, 7, 8, 9, 8, 7, 9]


Is there a better way than using, e.g.

>>> shape(where(array(data)==10))[1]
2
 

to compute the occurrence of 10 in the list which is 2 in this case ?

Nils



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