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2006 Jun 20
2
strange use of sapply
I've tried and give up. I have a matrix of say 200 columns and 400 rows.
For each odd ( or even i suppose if i wanted to )column,
I want to know the number of rows in which the value is greater than zero.
So, I did sapply(tempMatrix,2,function(x) sum( x > 0 ))
this almost works but i don't know how to tell
it to only do the odd columns. my guess is , like everything else
in R, this