R help - Oct 2009 - else if statement error

Hello,

I am doing a simple if else statement in R. But it always comes out error
such as 'unexpected error'
There are two variables. ini and b. when ini=1, a=3; when ini>1 and b>2,
a=5; all other situations, a=6. I don't know where it is wrong.
Here is my code

ini=3
b=4
     if (ini==1) {
  a=3
     }
    else if (ini>1 and b>2 ) {
   a=5
    }
   else {a=6}


Thanks a lot.
-- 
Best,
Chen

	[[alternative HTML version deleted]]

align the 'else if' and 'else' with the closing curly brackets.

if (condA){
   doStuff()
} else if (condB){
   doOtherStuff()
} else {
   doWhatever()
}

b

On Oct 3, 2009, at 12:54 PM, Chen Gu wrote:
> Hello,
>
> I am doing a simple if else statement in R. But it always comes out  
> error
> such as 'unexpected error'
> There are two variables. ini and b. when ini=1, a=3; when ini>1 and  
> b>2,
> a=5; all other situations, a=6. I don't know where it is wrong.
> Here is my code
>
> ini=3
> b=4
>     if (ini==1) {
>  a=3
>     }
>    else if (ini>1 and b>2 ) {
>   a=5
>    }
>   else {a=6}
>
>
> Thanks a lot.
> --
> Best,
> Chen
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
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> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

On Oct 3, 2009, at 11:54 AM, Chen Gu wrote:
> Hello,
>
> I am doing a simple if else statement in R. But it always comes out  
> error
> such as 'unexpected error'
> There are two variables. ini and b. when ini=1, a=3; when ini>1 and  
> b>2,
> a=5; all other situations, a=6. I don't know where it is wrong.
> Here is my code
>
> ini=3
> b=4
Your basic problem is that you are confusing if and else which are  
program control functions with ifelse which is designed for assignment  
purposes;

 > ini=3
 > b=4
 >   a <-   ifelse( ini==1, 3, ifelse( ini>1 & b>2 , 5, 6))
 >
 > a
[1] 5
>     if (ini==1) {
>  a=3
>     }
>    else if (ini>1 and b>2 ) {
The error is probably being thrown because "and" is not a valid  
conjunction operator in R.
 > 1 and 1
Error: syntax error
 > 1 & 1
[1] TRUE

>   a=5
>    }
>   else {a=6}
>
> e.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT

On 03/10/2009 11:54 AM, Chen Gu wrote:
> Hello,
> 
> I am doing a simple if else statement in R. But it always comes out error
> such as 'unexpected error'
> There are two variables. ini and b. when ini=1, a=3; when ini>1 and
b>2,
> a=5; all other situations, a=6. I don't know where it is wrong.
> Here is my code
> 
> ini=3
> b=4
>      if (ini==1) {
>   a=3
>      }
The statement above is complete, so it will be evaluated.
>     else if (ini>1 and b>2 ) {
Then R sees the else, which can't start a new statement, and signals an 
error.  Put the else on the same line as the previous closing brace and 
things will be fine.

Duncan Murdoch
>    a=5
>     }
>    else {a=6}
> 
> 
> Thanks a lot.