[R] delete rows whose sum is X

[Uwe Ligges]

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
>>>
>>> --
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>>>
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>>
>