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select data

David L Carlson 
This overwrites the data so you might want to create a copy first.

example <- data.frame(V1=c(3, -1), V2=c(-2, 4), V3=c(4, 1))
tf <- ifelse(example<0, TRUE, FALSE)
example[tf] <- NA
apply(example, 1, mean, na.rm=TRUE)

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David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352

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Andrea Sica select data May 14 R. Michael Weylandt select data May 14 David L Carlson select data May 14 David Winsemius select data May 14 Andrea Sica select data May 14 S Ellison select data May 14