Re: [Numpy-discussion] Count the occurrence of a certain integer in a list of integers
Alan G Isaac wrote: > On Tue, 07 Aug 2007, Nils Wagner apparently wrote: > >> 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 >> > > > You did not say why data.count(10) is unsatisfactory ... > > Cheers, > Alan Isaac > > > > > ___ > Numpy-discussion mailing list > Numpy-discussion@scipy.org > http://projects.scipy.org/mailman/listinfo/numpy-discussion > Thank you for all your input. To be honest I was not aware of all these possibilities to solve my problem. If you distribute a task among different people you will obtain different methods of resolution. Nils ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Count the occurrence of a certain integer in a list of integers
By the way, you can get all the frequencies pretty fast using a defaultdict: http://docs.python.org/lib/defaultdict-examples.html Cheers, Alan Isaac ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Count the occurrence of a certain integer in a list of integers
On Tue, 07 Aug 2007, Nils Wagner apparently wrote: > 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 You did not say why data.count(10) is unsatisfactory ... Cheers, Alan Isaac ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Count the occurrence of a certain integer in a list of integers
Nils Wagner wrote: > 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 ? Your way is ok if you want to count just a few numbers. If you want all, you may sort the array and use searchorted: b = sort( a ) count = searchsorted( b, 7, side = 'right' ) - searchsorted( b, 7, side = 'left' ) r. ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Count the occurrence of a certain integer in a list of integers
On 8/7/07, Keith Goodman <[EMAIL PROTECTED]> wrote: > On 8/7/07, Nils Wagner <[EMAIL PROTECTED]> wrote: > > 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 ? > > Would list comprehension work? > > len([z for z in data if z == 10]) Or is this faster? (array(x)==10).sum() ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Count the occurrence of a certain integer in a list of integers
On 8/7/07, Nils Wagner <[EMAIL PROTECTED]> wrote: > 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 ? Would list comprehension work? len([z for z in data if z == 10]) ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
Re: [Numpy-discussion] Count the occurrence of a certain integer in a list of integers
You can try using hist() with the correct range and number of bins. Matthieu 2007/8/7, Nils Wagner <[EMAIL PROTECTED]>: > > 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 > > ___ > Numpy-discussion mailing list > Numpy-discussion@scipy.org > http://projects.scipy.org/mailman/listinfo/numpy-discussion > ___ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
