[R] Error handling

[Ernesto Jardim]

Hi 

I wrote a function implementing an algoritm for simulation of spatial
sampling plans (using geoR).

I'm using a range of parameters to perform several simulation and
sometimes this parameters create function errors wich cause the algoritm
to stop.

How can I avoid this ?

Below there's a small example that I made to study the problem but I was
not able to solve it. I've tried "restart" function but it caused an
endeless loop. 

All help is wellcome.

> # function
> 
> fun.test<-function(vec){
+ for(i in 1:length(vec)){
+ a <- log(vec[i])
+ cat(vec[i],a,"\n")
+ }
+ }
> 
> # case 1
> 
> vec<-c(2,4,6)
> 
> fun.test(vec)
2 0.6931472 
4 1.386294 
6 1.791759 
> 
> # case 2
> 
> vec<-c(2,4,"a",6)
> 
> fun.test(vec)
Error in log(x) : Non-numeric argument to mathematical function

I want that in case 2 the function jumps "a" and continues giving a
similar result to case 1.

Thanks

EJ

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