[R] no line number from error
murdoch.duncan at gmail.com
Fri Apr 25 01:29:55 CEST 2014
On 24/04/2014, 6:40 PM, Ross Boylan wrote:
> > r1 <- totalEffect.all(dsim, simjob)
> Error: attempt to apply non-function
> > traceback()
> 1: totalEffect.all(dsim, simjob)
> > class(totalEffect.all)
>  "function"
> How can I find out where in totalEffect.all the error is arising?
> My only theory for the lack of line number was that totaEffect.all was
> not a function; it is. Further, previous calls to the function worked,
> and errors in it produced line numbers. After fixing a previous error
> I'm now getting this.
> All my code is sourced from files except for the driver. The driver
> code is in the same file that defines totalEffect.all.
I don't understand this. If totalEffect.all is in a file that is not
sourced, where did it come from?
Generally the rule is that if you source a function from a file you'll
get line number information attached to it, so you should see a line
number reported when an error occurs, or during debugging. There are
exceptions: you can turn this off, and by default, it is turned off for
functions defined in packages (but you can turn it on if you re-install
> In this particular case I stepped through with the debugger and found
> that in the line
> accums[[m]]$delta$accum(up - down, data)
> the delta object was NULL and so accum is not a function on it. But I
> hope there's a better way to locate an error.
If the line that triggered this error was in a function that had line
number information, it sounds like it might be a bug. Can you simplify
it down to a simple reproducible example that I could look at?
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