R help - Feb 2007 - help with tryCatch

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

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.
>

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.
> >>
>