"Robin Gruna" <[EMAIL PROTECTED]> writes:
> I have the following problem: I have a list as follows,
>
> > values <- list(red = 1, yellow = 2, blue = 3)
>
> > values
> $red
> [1] 1
>
> $yellow
> [1] 2
>
> $blue
> [1] 3
>
> There is also a vector containing the diffrent "colors" as character strings:
>
> > colors <- c("red", "red", "blue", "yellow", "red", "blue")
> > colors
> [1] "red" "red" "blue" "yellow" "red" "blue"
>
> Now i can attach the list values to R:
>
> > attach(values)
> > red
> [1] 1
>
> etc...
>
> Now to my problem: How can I make R in a simple way to evaluate the strings "red",
> "blue" etc. as variables, returning their numeric values ?
> As result I want to get a vector containing the values of the colors like this one:
>
> > values.colors
> [1] 1 1 3 2 1 3
Forget about the attach() business, and do
values <- unlist(values) # or values <- c(red = 1, yellow = 2, blue = 3)
values.colors <- values[colors]
If you insist on going via variables, try
sapply(colors, get)
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
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