[R] delete rows whose sum is X

[Ivan Calandra]

True, I didn't think about it because the matrix is supposed to be 
filled with 0 and 1, and I automatically thought about integers. It 
wouldn't be a problem with integers, right?

Le 3/4/2011 15:47, Uwe Ligges a écrit :
>
>
> On 04.03.2011 15:41, Ivan Calandra wrote:
>> Oops, forgot one "=":
>> mat[apply(mat, 1, FUN=function(x) sum(x)==5),]
>
>
> Yes, but since floating point issues may ba apparent in the end, I'd 
> vote for:
>
> mat[apply(mat, 1, FUN = function(x) isTRUE(all.equal(sum(x), 5))),]
>
>
>>
>> Le 3/4/2011 15:36, Ivan Calandra a écrit :
>>> Hi Mikael
>>>
>>> You really need to provide a reproducible example in the future, it
>>> will help people to better understand what you want to do and help
>>> you, and help you better understand the answers as well.
>>>
>>> Try something like this:
>>> mat[apply(mat, 1, FUN=function(x) sum(x)=5),]
>>>
>>> HTH,
>>> Ivan
>>>
>>> Le 3/4/2011 14:50, purna a écrit :
>>>> Rnoob here.
>>>> I have a matrix of zeroes ond ones. I want to delete the rows whose
>>>> sum of
>>>> values is not =5, alternatively extract the rows who sum up to 5.
>>>>
>>>> Thank you/Mikael
>>>>
>>>> -- 
>>>> View this message in context:
>>>> http://r.789695.n4.nabble.com/delete-rows-whose-sum-is-X-tp3335254p3335254.html 
>>>>
>>>>
>>>> Sent from the R help mailing list archive at Nabble.com.
>>>>
>>>> ______________________________________________
>>>> R-help at r-project.org mailing list
>>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>>> PLEASE do read the posting guide
>>>> http://www.R-project.org/posting-guide.html
>>>> and provide commented, minimal, self-contained, reproducible code.
>>>>
>>>
>>
>

-- 
Ivan CALANDRA
PhD Student
University of Hamburg
Biozentrum Grindel und Zoologisches Museum
Abt. Säugetiere
Martin-Luther-King-Platz 3
D-20146 Hamburg, GERMANY
+49(0)40 42838 6231
ivan.calandra at uni-hamburg.de

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