[R] switch with a single character

[Charles C. Berry]

On Thu, 6 Mar 2008, Henrik Andersson wrote:

> Can anyone explain the results from switch below when a single
> charachter "E" is entered? It seems to work with letter S or N...


?switch
.
.
.

Warning:

      Beware of partial matching: an alternative 'E = foo' will match
      the first argument 'EXPR' unless that is named. See the examples
      for good practice in naming the first argument.

HTH,

Chuck


>
>
>> switch("East",West=1,East=2)  # Correct
> [1] 2
>> switch("E",W=1,E=2) # Not so correct
> [1] 1
>> switch("E",E=1,W=2) # Even stranger
> [1] "E"
>> switch("S",N=1,S=-1) # Correct
> [1] -1
>
> Kind regards, Henrik
>
> -- 
> Henrik Andersson
> Tullstorp 2526
> 28195 Vankiva
> Sweden
>
> Tel: +46 451 19149
> Mobil: +46 763 406779
>
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>

Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901