Suppose you have

x = np.array([1, 2, 3, 4])

Then

x > 2 = [False, False, True, True]

Using boolean indexing

x[x > 2] = [3, 4]
--
Flavio


On Fri, Mar 8, 2013 at 4:41 PM, Ronnie Ghose <ronnie.gh...@gmail.com> wrote:
> That uses the Boolean indexing function of numpy arrays iirc
>
> On Mar 8, 2013 1:28 PM, "Mohamed Radhouane Aniba" <arad...@gmail.com> wrote:
>>
>> Simply because I am new to both python and scikit (Coming from R world)
>>
>> The problem is that I tried using load_svmlight_file with in particular
>> RBF parameters example
>> http://scikit-learn.org/stable/auto_examples/svm/plot_rbf_parameters.html#example-svm-plot-rbf-parameters-py
>>
>> and I get a lot of problems / errors/ so I thought it is easier to use
>> native format which preserve the structure of the variables used.
>>
>> What I tested in this script in particular is something like :
>>
>> #iris = load_iris()
>> #X = iris.data
>> #Y = iris.target
>> X,Y = load_svmlight_file("toto")
>> X = X.toarray()
>>
>> # dataset for decision function visualization
>>
>> X_2d = X[:, :2]
>> X_2d = X_2d[Y > 0]
>> Y_2d = Y[Y > 0]
>> Y_2d -= 1
>>
>> What does the section _2d means ? not vey clear
>>
>> Rad
>>
>> On Mar 8, 2013, at 1:21 PM, Philipp Singer <kill...@gmail.com> wrote:
>>
>> > Why do you want to convert libsvm to another structure?
>> >
>> > I don't quite get it.
>> >
>> > If you want to use examples: scikit learn has included datasets that can
>> > be directly loaded. I think this section should help:
>> > http://scikit-learn.org/stable/datasets/index.html
>> >
>> > Am 08.03.2013 18:44, schrieb Mohamed Radhouane Aniba:
>> >> Hello !
>> >>
>> >> I am wondering if someone has developed a snippet or a script that
>> >> converts libsvm format into a format directly usable by scikit without the
>> >> need to use of load_svmlight_file.
>> >>
>> >> The reason is that I am trying to use the examples provided on the
>> >> website, but all of them are written in a format that is not a libsvm one.
>> >>
>> >> Thanks
>> >>
>> >> Rad
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> ------------------------------------------------------------------------------
>> >> Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester
>> >> Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the
>> >> endpoint security space. For insight on selecting the right partner to
>> >> tackle endpoint security challenges, access the full report.
>> >> http://p.sf.net/sfu/symantec-dev2dev
>> >> _______________________________________________
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>> >> https://lists.sourceforge.net/lists/listinfo/scikit-learn-general
>> >
>> >
>> >
>> > ------------------------------------------------------------------------------
>> > Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester
>> > Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the
>> > endpoint security space. For insight on selecting the right partner to
>> > tackle endpoint security challenges, access the full report.
>> > http://p.sf.net/sfu/symantec-dev2dev
>> > _______________________________________________
>> > Scikit-learn-general mailing list
>> > Scikit-learn-general@lists.sourceforge.net
>> > https://lists.sourceforge.net/lists/listinfo/scikit-learn-general
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester
>> Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the
>> endpoint security space. For insight on selecting the right partner to
>> tackle endpoint security challenges, access the full report.
>> http://p.sf.net/sfu/symantec-dev2dev
>> _______________________________________________
>> Scikit-learn-general mailing list
>> Scikit-learn-general@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/scikit-learn-general
>
>
> ------------------------------------------------------------------------------
> Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester
> Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the
> endpoint security space. For insight on selecting the right partner to
> tackle endpoint security challenges, access the full report.
> http://p.sf.net/sfu/symantec-dev2dev
> _______________________________________________
> Scikit-learn-general mailing list
> Scikit-learn-general@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/scikit-learn-general
>

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Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester  
Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the  
endpoint security space. For insight on selecting the right partner to 
tackle endpoint security challenges, access the full report. 
http://p.sf.net/sfu/symantec-dev2dev
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