[R] Vector Assignments

[Spencer Graves]

      One way is to use "ifelse": 

x <- seq(100, 1000, by=100)
x.col <- ifelse(x < 250, "red",
    ifelse(x<500, "blue", ifelse(x<750, "green", "black")))
data.frame(x, x.col)
      x x.col
1   100   red
2   200   red
3   300  blue
4   400  blue
5   500 green
6   600 green
7   700 green
8   800 black
9   900 black
10 1000 black

      Does this seem reasonable? 
      spencer graves

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
>
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