[R] Is there any concise way to write a one-to-one mapping?

[Jeff Newmiller]

Assuming your data are in a data frame, make anorher data frame with the type and type2 columns and merge it with your original data frame.

?merge
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Sent from my phone. Please excuse my brevity.

On September 14, 2015 10:35:38 AM PDT, jpm miao <miaojpm at gmail.com> wrote:
>My code is:
>
>
>
>if(type=="none")
>
>  type2<-"nc"
>
>if(type=="drift")
>
>  type2<-"c"
>
>if(type=="trend")
>
>  type2<-"ct"
>
>
>I am wondering if there's a concise way to write a mapping from type to
>type2, especially when the number of categories is high. Thanks!
>
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>
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