[R] switch() usage

[Michael A. Gilchrist]

Hi Dan,

No, I hadn't thought of that and it WORKS!

I was hoping there'd be such a simple solution.  I have new respect for the 
power of  {} w/in R.

Many thanks!

Mike

-----------------------------------------------------
Department of Ecology & Evolutionary Biology
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University of Tennessee
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phone:(865) 974-6453
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On Tue, 26 Aug 2008, Nordlund, Dan (DSHS/RDA) wrote:

>> -----Original Message-----
>> From: r-help-bounces at r-project.org
>> [mailto:r-help-bounces at r-project.org] On Behalf Of Michael A.
>> Gilchrist
>> Sent: Tuesday, August 26, 2008 6:03 PM
>> To: r-help at r-project.org
>> Subject: [R] switch() usage
>>
>> Hello,
>>
>> I am wondering if it is possible to run separate lines of
>> code within switch()
>> as one can do in most languages.
>>
>> For example, I'd like to have switch execute a few lines of
>> code based on the
>> value passed to it.
>>
>> For example,
>>
>>> index = 1
>>>
>>> switch(index,
>>> 	command 1; command 2; command 3, #execute if index = 1
>>> 	command 4; command 5; command 6, #execute if index = 2
>>> 	command 7....                    #execute if index = 3
>>>
>>> )
>>
>> However, if I try this syntax, I get an error about an
>> unexpected ';'. I've
>> tried wrapping the commands in () but that doesn't help either.
>>
>> Is there a way to do this without having to  write separate
>> functions for each
>> of the switch possibilities.
>>
>> Thanks.
>>
>>
>> Mike
>>
>>
> Mike,
>
> Did you try wrapping the series of commands in braces {}:
>
> switch(index,
> 	{command 1; command 2; command 3}, #execute if index = 1
> 	{command 4; command 5; command 6}, #execute if index = 2
> 	{command 7....   }                 #execute if index = 3
> )
>
> Hope this is helpful,
>
> Dan
>
> Daniel J. Nordlund
> Washington State Department of Social and Health Services
> Planning, Performance, and Accountability
> Research and Data Analysis Division
> Olympia, WA  98504-5204
>
>
>
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