It is well explained here
http://www.burns-stat.com/pages/Tutor/R_inferno.pdf page 67.

On Sat, Jan 21, 2012 at 9:56 PM, Ery Arias-Castro <eariasca@ucsd.edu> wrote:

> Hello,
>
> This example seems strange to me:
>
> > if (2 > 3) print('Yes'); else print('No')
> Error: unexpected 'else' in " else"
>
> > {if (2 > 3) print('Yes'); else print('No')}
> Error: unexpected 'else' in "{if (2 > 3) print('Yes'); else"
>
> > {
> +       if (2 > 3) print('no')
> +       else print('yes')
> + }
> [1] "yes"
>
>
> Any enlightening comments?
>
> Ery
>
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