R help - Jan 2013 - Making an aggregated factor variable from an existing one

Hi,

This is quite simple data manipulation task and I need help for it. I 
want to make new factor variable that is an aggregation of an existing 
factor.

This works as I intended:

X[Y == "original label"] <- " new label"

How to make following work then (to make coding more convenient):

original.labels <- c("ol.1","ol.2","ol.3")

X[Y == original.labels] <- "new label"

Cheers,

Antti

Hi, Antti,

you should look at

?levels

(and particular its "Examples" section) to find out how to use

levels( X) <- c( "new1", ......., "newk")

to achieve what you want.

  Regards  --  Gerrit


On Thu, 17 Jan 2013, Antti Simola wrote:
> Hi,
>
> This is quite simple data manipulation task and I need help for it. I want
to
> make new factor variable that is an aggregation of an existing factor.
>
> This works as I intended:
>
> X[Y == "original label"] <- " new label"
>
> How to make following work then (to make coding more convenient):
>
> original.labels <- c("ol.1","ol.2","ol.3")
>
> X[Y == original.labels] <- "new label"
>
> Cheers,
>
> Antti
>
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