Dear Mark,
Thanks for this. Can you please explain me what is the difference between
ifelse and if?
generally if there is more than one syntax within the 'if' I use 'if' loop
otherwise I use 'ifelse' loop. Is it the only difference between them?
Mark Wardle <[EMAIL PROTECTED]> wrote: On 21/10/2007, stat stat wrote:
> I have created a if loop as follows:
>
> name = "e"
> if (name == "v")
> {
> u = 0
> }
> else u = 1
>
> however i am getting error : Error: unexpected 'else' in "else"
There are 3 issues here:
1. Do you appreciate the difference between ifelse and if ? What are
you actually trying to do - in this context, ifelse would usually be
more sensible but as you've not said what you want to do, it is
difficult to guess.
2. I don't get the same error as you. Which version of R are you using?
> if (name=="v")
+ {
+ u=0
+ }
> else u=1
Error: syntax error
This error message makes it clear that there is a syntax problem. In
fact, look at the lefthand column of characters and you should see
what the problem is....
3. R is interpreting your code as two separate expressions because you
are using an interactive shell. Try this instead:
if (name=='v') {
u=1
} else {
u=0
}
Hope this helps.
Best wishes,
Mark
--
Dr. Mark Wardle
Specialist registrar, Neurology
Cardiff, UK
thanks in advance
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