Re: histogram with negativ values

[Ethan M. <merritt@u.washington.edu>]

On Wednesday 09 July 2008 02:58:05 Christian wrote:
> Hello,
> 
> I tried the histogram function with gnuplot. I have positive and negative 
> values. I would expect that negative values will be start from zero but in 
> the opposite direction as the positive values.

They do, yes.
    set style plot histogram cluster
    set auto y
    plot 'foo' (column(1)), 'foo' (-column(1))
gives you one bar going up and one bar going down for each entry. 

> I would also expect this for  the stacked histogram. 

That would make no sense. It is not possible to mix positive and negative
values in a  stacked histogram.  The resulting represenation has no
unique interpretation.  In a nutshell, the plot would be useless.

> But gnuplot does not work this way. 
> 
> Is this a bug? Will this be changed in the future.

No bug that I know of.
If you have a script that mis-behaves, please provide the script.

-- 
Ethan A Merritt
Biomolecular Structure Center
University of Washington, Seattle 98195-7742