[FORGED] Problem related to rowSums

Hi...

I have a dataframe with n columns and n rows. I need to find how many rows
contains zero raw read count across all column.

(1) You should probably have a *matrix*, not a data frame.

(2) Have you ever heard of the idea of providing a *reproducible* example?

(3) I *think* the following may be what you want/need:

M <- as.matrix(M) # Where the initial M is your "data frame".
sum(apply(M,1,function(x){isTRUE(all.equal(x,rep(0,length(x))))}))

Untested, since you did not supply a reproducible example.

cheers,

Rolf

Technical Editor ANZJS
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276