Hi, Tammy,
maybe you find something interesting looking at
?interaction
and/or try (with df being your data frame)
df$Group <- as.integer( with( df, interaction( Feature, OS)[, drop =
TRUE]))
HtH -- Gerrit
On Tue, 22 Jan 2013, Tammy Ma wrote:
HI,
I met this problem:
I have the feature data frame:
Feature OS
4 2
4 1
4 3
1 2
4 1
what I want to do is to autimatically create one more column called "group":
Feature OS Group
4 2 1
4 1 2
4 3 3
1 2 4
4 1 2
I don't want "Ifelse", because I have so many combination of feature and OS, I
even can not account. I just want to have sth to autimatically create group indicator
based on the difference combination of feature and OS.
Thanks for your help.
Kind regards,
Tammy
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