[EMAIL PROTECTED] wrote:
I have a data frame (df) with colums x, y and z. e.g. df <- data.frame(x = sample(4), y = sample(4), z = sample(4)) I can extract column z by: df$z or df[3] I can also extract columns x,y by: df[1:2] or by df[-3].
Is it possible to extract x,y columns in a "symbolic" fashion i.e. by equivalent of df[-z] (which is illegal) ???
df[,dimnames(df)[[2]] %in% c("x","y")] or df[,dimnames(df)[[2]] != "z"] should do this.
Marlene
-- PD Dr. Marlene M�ller Fraunhofer ITWM Kaiserslautern, Abt. Finanzmathematik mailto:[EMAIL PROTECTED], Tel/Fax: +49 631 205 4189/4139 http://www.itwm.fhg.de/de/fm__employees__mueller/mueller/
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