Hoi Jinsong,
--On dinsdag 3 augustus 2004 1:42 -0700 Jinsong Zhao <[EMAIL PROTECTED]> wrote:
For instance, I hope to remove the V3~6 column, for all the value in those colume is zero.
V3 V4 V5 V6 V7 V8 V9 V10 1 0 0 0 0 0.000 0.000 0.000 0.000 2 0 0 0 0 0.000 0.000 0.000 0.000 3 0 0 0 0 0.000 0.000 0.000 0.000 4 0 0 0 0 0.000 0.000 0.000 0.000 5 0 0 0 0 0.000 0.000 0.000 0.000 6 0 0 0 0 -0.001 -0.001 -0.001 -0.001 7 0 0 0 0 0.000 0.000 0.000 -0.001 8 0 0 0 0 0.000 0.000 0.000 -0.001 9 0 0 0 0 -0.009 -0.012 -0.015 -0.018
I mean how to select the first four columns.
subset(df, select=-c(V3,V4,V5,V6))
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