[R] counting columns that fulfill specific criteria

[pguilha]

Hi,

I have a matrix (pwdiff in the example below) with ~480000 rows and 780
columns.
For each row, I want to get the percentage of columns that have an absolute
value above a certain threshold "t". I then want to allocate that percentage
to matrix 'perc' in the corresponding row. Below is my attempt at doing
this, but it does not work: I get 'replacement has length zero'. Any help
would be much appreciated!!

perc<-matrix(c(1:nrow(pwdiff)))
for (x in 1:nrow(pwdiff))
perc[x]<-(((ncol(pwdiff[,abs(pwdiff[x,]>=t)]))/ncol(pwdiff))*100)

I should add that my data has NAs in some rows and not others (but I do not
want to just ignore rows that have NAs)

Thanks!

Paul

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