[R] error handling

[Torsten Hothorn]

>   Hi,
>   
>   In R, when there is error, the whole program just stops by default.
> However, sometimes we don't want this happen, we want the program continue
> and also control the flow by ourselves. Is there a way to do this 
>  pseudo code:
> 
>    If(error) then do {...}.

maybe warning() is useful...

Torsten

> 
>   Thanks.
> 
>   Rong
> 
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