[R] Set value if else...

[Joshua Wiley]

Dear Joel,

On Fri, Oct 15, 2010 at 1:16 AM, Joel <joda2457 at student.uu.se> wrote:
>
> Hi
>
> I want to set a variable to either 1 or 0 depending on an value of a
> dataframe and then add this as a colum to the dataframe.
>
> This could be done with a loop but as we are able to do questions on a
> complete row or colum without a loop it would be sweet if it could be done.
>
> for example:
>
> table:
>
> Name  Age
> Joel     24
> agust   17
> maja    40
> and so on...
>
> And what I want to do is a command that gives me
> VoteRight<-1 if table$age>18 else set VoteRight to 0

You're closer than you know:

table$VoteRight <- ifelse(table$age > 18, 1, 0)

?ifelse   is a vectorized function [ifelse(logical test, value if
TRUE, value if FALSE)], and you would not even need to cbind() it into
your table.

Josh

>
> Then use cbind or something to add it to the table.
>
> so i get
> Name  Age  VoteRight
> Joel     24    1
> agust   17    0
> maja    40    1
>
> And as I said before im guessing this can be done without a loop...
>
> //Joel
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-- 
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/