Re: unset var [was Re: Problem and solution: Patch for new "stats" command]

[Philipp K. J. <ja...@ie...>]

On Tuesday 10 November 2009 01:00:16 pm Hans-Bernhard Bröker wrote:
> Ethan Merritt wrote:
> [...]
>
> > For one thing, we don't currently have any easy way to undefine all
> > these variables.  "show var GPSTAT" would show all of them, but
> > "undefine GPSTAT" doesn't get rid of them.  That's fixable, I suppose,
> > but I don't like the variables for another reason...
> >
> > 4) I suggest adding a mechanism for explicitly clearing out the set of
> > stats calculations.  One obvious syntax is
> >     reset stats
>
> This one deserves generalization.  Unless I missed something, we
> currently don't have a command to get rid of any variable (short of
> 'exit' and starting a new session), whereas the number of variables we
> have gnuplot create by itself seems to be increasing all the time (first
> "fit" results, then GPVAL_*, now possibly GPSTAT_*).
>
> I think a generic
>
> 	unset variable {<name>| pattern <regex> | fit | stats}
>

I fully agree. Zoltan and I discussed this and even
implemented a function that will do that. We just
don't currently expose it as a command - partially
because we did not want to add yet another user-level
command. 

But the idea of overloading unset for this purpose is
a good one.

> command would be in order.  I would prefer 'unset' over 'reset' here
> because it matches 'show variables' a bit better than 'reset'.  It
> should probably be extended to user-defined functions, too.  And maybe
> we should even allow
>
> 	set variable <var>=<expr>
> and
> 	set function <name>(<arguments>)=<expression>
>
> as an optional syntax instead of the usual <var>=<expr> etc., too.
>
>
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