Re: with parallelaxes dumps core

[sfeam <sf...@us...>]

On Monday, 26 January 2015 07:28:19 PM Philipp K. Janert wrote:
> 
> The new plot style "with parallelaxes"
> is cute. Unfortunately, it also dumps
> core - whenever there are more than 7
> columns to plot.

The maximum is set at compile time, but
yes the default is 7.  

> 1) This limitation is not mentioned in
> the doc. (As far as I can see.)

I thought it was, but now I can't find it either.
That is an oversight.

> 2) Dumping core unconditionally is not 
> a good user experience. It would be
> better to detect and reject the illegal
> input and warn the user.

Indeed.

> 3) The limitation to 7 cols (which, I
> suspect, depends on limitations in the
> way "using" is parsed) puts the entire
> plot style into question. The whole 
> point of parallelaxes plots (to the 
> degree they HAVE a point) is to deal 
> with high-dim data, easily exceeding 7.

If you have such a use-case, go ahead and file a
feature request.  It should not be too hard to make
the axis structures dynamic rather than static.
The original request for this feature provided examples
from the literature but none of them had even as many
as 7 axes in a single plot.  So that seemed
adequate as a default.  Failing to check for more
columns of input than expected is purely a bug.

	Ethan

> I like this feature, in principle, but
> I am afraid the limitation to 7 columns
> really gets in the way.
> 
> There is one other thing: for practical 
> purposes, the ability to highlight a 
> single record (or group of records) in
> a parallel axis plot is really, really
> important (obviously the best way is 
> with the mouse). I tried to plot only
> a selected record via "every", but with
> a strange results: when selecting a single
> record (ev 170::170::) I get NO graph -
> just an empty canvas. (No warning either.)
> 
> Best,
> 
> 		Ph.
> 
> 
> 
> 
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