Try with double "== "instead:
ifelse(val3 == "Monthly", val <- val1, val <- val2)
Single "=" is for setting arguments within a function call. If you
want
to test equality, then double "==" is required.
See ?"=="
HTH,
Ivan
Le 3/10/2011 11:45, Vincy Pyne a ?crit :> Dear R helpers
>
> Suppose
>
> val1 = c(10, 20, 35, 80, 12)
> val2 = c(3, 8, 11, 7)
>
> I want to select either val1 or val2 depending on value of third quantity
val3.
>
> val3 assumes either of the values "Monthly" or
"Yearly".
>
> If val3 = "Monthly", then val = val1 and if val3 =
"Yearly", then val = val2.
>
> I tried the ifelse statement as
>
>
> ifelse(val3 = "Monthly", val = val1, val2)
>
> I get following error
>
>> ifelse(val3 = "Monthly", val = val1, val2)
> Error in ifelse(val3 = "Monthly", val = val1, val2) :
> unused argument(s) (val3 = "Monthly", val = val1)
>
>> val
> Error: object 'val' not found
>
> Kindly guide.
>
> Regards
>
> Vincy
>
>
>
> [[alternative HTML version deleted]]
>
>
>
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> and provide commented, minimal, self-contained, reproducible code.
--
Ivan CALANDRA
PhD Student
University of Hamburg
Biozentrum Grindel und Zoologisches Museum
Abt. S?ugetiere
Martin-Luther-King-Platz 3
D-20146 Hamburg, GERMANY
+49(0)40 42838 6231
ivan.calandra at uni-hamburg.de
**********
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