R help - May 2012 - question about TryCatch and lapply

Folks:

I've replaced an outer for-loop with lapply and it works great.  But, I
can't seem to do the following type of exception handling:

tryCatch(dlmMLE(x)$value==Inf,error = function(e) NULL)

which basically says if the likelihood is Inf, throw an error.  But what I
want it to do is just go to the next index in the list.  When I was using a
for-loop I used:

if(tryCatch(dlmMLE(x)$value==Inf,error = function(e) 1)==1) {next} else
.... which worked fine.

Is there a way to do the same thing in lapply?

Thanks for your time. (I've checked Gmane for this type of problem and I
wasn't sure if this problem was answered or not...)

John

	[[alternative HTML version deleted]]

Please show us the 'lapply' statement you are using.  Here is a simple
case of catching an error in an lapply and continuing:
> lapply(c(1,2,-3, 4), function(x){
+     a <- try(stopifnot(x > 0))  # force an error
+     if (inherits(a, 'try-error')) return(NULL)
+     x
+ })
Error : x > 0 is not TRUE
[[1]]
[1] 1

[[2]]
[1] 2

[[3]]
NULL

[[4]]
[1] 4
>

On Fri, May 25, 2012 at 2:51 PM, John Kerpel <john.kerpel at gmail.com>
wrote:
> Folks:
>
> I've replaced an outer for-loop with lapply and it works great. ?But, I
> can't seem to do the following type of exception handling:
>
> tryCatch(dlmMLE(x)$value==Inf,error = function(e) NULL)
>
> which basically says if the likelihood is Inf, throw an error. ?But what I
> want it to do is just go to the next index in the list. ?When I was using a
> for-loop I used:
>
> if(tryCatch(dlmMLE(x)$value==Inf,error = function(e) 1)==1) {next} else
> .... which worked fine.
>
> Is there a way to do the same thing in lapply?
>
> Thanks for your time. (I've checked Gmane for this type of problem and
I
> wasn't sure if this problem was answered or not...)
>
> John
>
> ? ? ? ?[[alternative HTML version deleted]]
>
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-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.