[R] Vector Assignments

[Hadley Wickham]

One way would be to create a vector of colours and then cut() to index 
the vector:

colours <- c("red", "blue", "green","back")
colours[cut(x, c(min(x),250,500,700,max(x)),lab=F)]

Hadley


Arend P. van der Veen wrote:

>Hi,
>
>I have simple R question.  
>
>I have a vector x that contains real numbers.  I would like to create
>another vector col that is the same length of x such that:
>
>if x[i] < 250 then col[i] = "red"
>else if x[i] < 500 then col[i] = "blue"
>else if x[i] < 750 then col[i] = "green"
>else col[i] = "black" for all i
>
>I am convinced that there is probably a very efficient way to do this in
>R but I am not able to figure it out.  Any help would be greatly
>appreciated.
>
>Thanks in advance,
>Arend van der Veen
>