[R] number of zeros in a matrix -row by row

[onyourmark]

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
> 
> ______________________________________________
> 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.
> 
> 

-- 
View this message in context: http://www.nabble.com/number-of-zeros-in-a-matrix--row-by-row-tp22893147p22901010.html
Sent from the R help mailing list archive at Nabble.com.