[R] help with tryCatch

[Stephen Bond]

Henrik,

thank you for the reference. Can you please tell me why the following 
does not work?

vec=c("hdfhjfd","jdhfhjfg")    # non-existent file names
catch=function(vec){
  tryCatch({
    ans =NULL;err=NULL;
    for (i in vec) {
      source(i)
      ans=c(ans,i)
    }
  },
  interrupt=function(ex){print(ex)},
  error=function(er){
     print(er)
     cat(i,"\n")
     err=c(err,i)          
  },
  finally={
    cat("finish")
  }
 ) #tryCatch
}
 
catch(vec) # throws an error after the first file and stops there while 
I want it to go through the list and accumulate the nonexistent 
filenames in err.

Thank you
Stephen

Henrik Bengtsson wrote:

> Hi,
>
> google "R tryCatch example" and you'll find:
>
>  http://www.maths.lth.se/help/R/ExceptionHandlingInR/
>
> Hope this helps
>
> Henrik
>
> On 2/13/07, Stephen Bond <sje at mast.queensu.ca> wrote:
>
>> Henrik,
>>
>> I had looked at tryCatch before posting the question and asked the
>> question because the help file was not adequate for me. Could you pls
>> provide a sample code of
>> try{ try code}
>> catch(error){catch code}
>>
>> let's say you have a vector of local file names and want to source them
>> encapsulating in a tryCatch to avoid the skipping of all good file names
>> after a bad file name.
>>
>> thank you
>> stephen
>>
>>
>> Henrik Bengtsson wrote:
>>
>> > See ?tryCatch. /Henrik
>> >
>> > On 2/12/07, Stephen Bond <sje at mast.queensu.ca> wrote:
>> >
>> >> Could smb please help with try-catch encapsulating a function for
>> >> downloading. Let's say I have a character vector of symbols and 
>> want to
>> >> download each one and surround by try and catch to be safe
>> >>
>> >> # get.hist.quote() is in library(tseries), but the question does not
>> >> depend on it, I could be sourcing local files instead
>> >>
>> >> ans=null;error=null;
>> >> for ( sym in sym.vec){
>> >> try(ans=cbind(ans,get.hist.quote(sym,start=start))) #accumulate in 
>> a zoo
>> >> matrix
>> >> catch(theurlerror){error=c(error,sym)} #accumulate failed symbols
>> >> }
>> >>
>> >> I know the code above does not work, but it conveys the idea. 
>> tryCatch
>> >> help page says it is similar to Java try-catch, but I know how to 
>> do a
>> >> try-catch in Java and still can't do it in R.
>> >>
>> >> Thank you very much.
>> >> stephen
>> >>
>> >> ______________________________________________
>> >> R-help at stat.math.ethz.ch 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.
>> >>
>>