[R] number of zeros in a matrix -row by row
onyourmark
william108 at gmail.com
Mon Apr 6 03:38:24 CEST 2009
Dear Dimitris,
Thanks very much. I tried dim(M) and get:
[1] 5030 2142
which I thought meant that my matrix M is actually a matrix, but
I tried str(M) and get:
int [1:5030, 1:2142] 2 1 2 0 1 0 2 1 2 -1 ...
When I tried
rowSums(M == 0)
I got:
Error in rowSums[M == 0] :
object of type 'closure' is not subsettable
What am I doing wrong?
Thanks so much.
Dimitris Rizopoulos-4 wrote:
>
> if 'M' is your matrix, then try this:
>
> rowSums(M == 0)
>
>
> I hope it helps.
>
> Best,
> Dimitris
>
>
> onyourmark wrote:
>> Hi. I have an n x m matrix M some of who's entries are zeros. I want to
>> know
>> how many zeros there are in each row -perhaps stored in a 1 x n vector
>> which lists the number of zeros for each row of M.
>>
>> Before I had a vector V and I was able to get the number of zeros in V by
>> doing length(V[ V==0]) but when I try something similar for M, like M[
>> M==0]
>> it creates a vector not a matrix and so this does not work. Does anyone
>> have
>> a solution to this?
>>
>> Thank you.
>
> --
> Dimitris Rizopoulos
> Assistant Professor
> Department of Biostatistics
> Erasmus University Medical Center
>
> Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
> Tel: +31/(0)10/7043478
> Fax: +31/(0)10/7043014
>
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