[R] Barplots inside loop - several data errors, workaround needed

[Jim Holtman]

?try

Sent from my iPad

On May 8, 2012, at 22:03, Lee <muellerl at gmail.com> wrote:

> I have a series of data which is managed through a loop. The loop creates
> "pivot tables" of my data using the *cast* function in the
> *reshape*library. For the most part, the data is all plotted
> correctly.
> Unfortunately, there are a couple of data sets which create errors and halt
> the loop.
> 
> One of the tables looks like the following:
> 
>  dbh Black Walnut
> 1   8     38.19722
> 2  10     48.89244
> 3  12     38.19722
> 
> When the loop attempts the barplot() function, the following error is
> returned:
> Error in seq_len(p) : argument must be coercible to non-negative integer
> 
> In other cases, there is simply no data in the specified set of data.
> Therefore, the table is full of NA's. Obviously, this does not need to be
> plotted, but I cannot simply remove it from the larger database. I need my
> loop to continue regardless of if it runs into these issues.
> 
> *Question: What can I do to ensure the above single variable table will
> plot correctly? and what can I do to suppress errors on the datasets which
> do not have data so the loop continues?*
> 
> full code: http://pastebin.com/LB88hpfM
> 
> Thank you in advance.
> 
> --
> all the best,
> Lee Mueller
> ISA Certified Arborist MI-4148A
> Registered Forester #46043
> 
>    [[alternative HTML version deleted]]
> 
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