[R] delete rows whose sum is X

[Uwe Ligges]

On 04.03.2011 15:52, Ivan Calandra wrote:
> 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?

If the matrix is really an integer matrix, right, otherwise not.

Best,
Uwe



>
> 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.
>>>>>
>>>>> ______________________________________________
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>>>>> PLEASE do read the posting guide
>>>>> http://www.R-project.org/posting-guide.html
>>>>> and provide commented, minimal, self-contained, reproducible code.
>>>>>
>>>>
>>>
>>
>