Re: switch keyword

[<Dario.Ciraki@ubs.com>]

I assume you also wish to cover the cases where your integer vector takes values of 20 and 50 exactly, as your specifications would exclude them.

 

switch within an if loop would be slow if you wish to recode large vectors, an efficient solution for your case can be to use: 

 

ifelse(x <= 20,1,0) + ifelse(x <= 50 & x > 20, 2,0) + ifelse(x >= 50,3,0)

 

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From: s-news-owner@lists.biostat.wustl.edu [mailto:s-news-owner@lists.biostat.wustl.edu] On Behalf Of carol white
Sent: 09 October 2007 15:09
To: s-news@lists.biostat.wustl.edu
Subject: [S] switch keyword

Hi,
I have an integer vector that I want to convert to a 
categorical vector with values 1, 2, 3. 
If the value of an element of the 
integer vector < 20, then, the value of the corresponding element in the 
categorical vector will be 1 
if the value of an element of the integer 
vector > 20 and < 50, then, the value of the corresponding element in the 
categorical vector will be 2
if the value of an element of the integer vector 
> 50, then, the value of the corresponding element in the categorical vector 
will be 3

can I do this by switch and how

look forward to your 
feedback

carol

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