[R] Error handling

[Uwe Ligges]

Ernesto Jardim wrote:
> 
> 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.

See ?try.

Uwe Ligges
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