# [R] if/else scope

P.B. Lecavalier p.barill at gmail.com
Wed Nov 16 03:11:29 CET 2011

```On 11/15/2011 06:46 PM, Kevin Burton wrote:
> What is wrong with the following?
>
>
>
> x<- 1:2
>
> if(x[1]>  0)
>
> {
>
>                  if(x[2]>  0)
>
>                  {
>
>                                  print("1&  2>  0")
>
>                  }
>
>                  else
>
>                  {
>
>                                  print("1>  0")
>
>                  }
>
> }
>
> else
>
> {
>
>                  if(x[2]>  0)
>
>                  {
>
>                                  print("2>  0")
>
>                  }
>
>                  else
>
>                  {
>
>                                  print("NONE>  0")
>
>                  }
>
> }
>
>
>
> Gives me
>
>
>
> Error: unexpected 'else' in "else"
>
>
>
> What am I missing?
>
>
>
> Kevin
>
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>
x <- 1:2

#this works

if (x[1] > 0)
{ if (x[2] > 0)   print("1 & 2 > 0")  else  print("1 > 0")  } else
{ if (x[2] > 0) print("2 > 0")  else print("NONE > 0") }

#this works

if (x[1] > 0)
{ if (x[2] > 0)   print("1 & 2 > 0")
else  print("1 > 0")  }         else
{ if (x[2] > 0) print("2 > 0")
else print("NONE > 0") }

#this doesn't

if (x[1] > 0)
{ if (x[2] > 0)   print("1 & 2 > 0")
else  print("1 > 0")  }
else  { if (x[2] > 0) print("2 > 0")  else print("NONE > 0") }

Conclusion: if-else in R is not quite free-form.

--
Philippe Baril Lecavalier

```

More information about the R-help mailing list