[R] How to catch an error using try

[jim holtman]

gotError <- try(gene.seq <- getSequence
(id=gene.map[,"ensembl_transcript_id"], type="ensembl_transcript_id",
seqType="3utr", mart=hmart))
if (inherits(gotError, 'try-error')){.....error occurred, do recovery........}

On Mon, Aug 3, 2009 at 11:53 AM, <mauede at alice.it> wrote:
> Sometimes the following function call causes a database exception:
>
>>  gene.seq <- getSequence (id=gene.map[,"ensembl_transcript_id"], type="ensembl_transcript_id",
> +                              seqType="3utr", mart=hmart)
>
> I understand the above function must be called by try to capture the eventual error.
> WHat is not clear to me is how to realize that an error has occurred. The on-line documentation
> mentions an invisible object of class "try-error".
> How shall I test whetehr such object has been created or not ?
> I assume it is created whenever an error does occur ....?
>
> Thank you for your help.
> Maura
>
>
> tutti i telefonini TIM!
>
>
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>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

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