Re: cvs: log cb broken

[Tait <gnu...@t4...>]

Petr Mikulik <mikulik_physics.muni.cz> said (on 2008/01/04):
> No, the error message is not correct, it should autoscale the cb-value to a
> lower positive value, as it does in the same case for "with image" for
> logged y or z axes. There must have been some change in cvs which broke this
> for "matrix with image".
>
> Gnuplot has been always excellent in handling negative ranges in log scales.
> For example,
>
>	gnuplot> set xrange [-10:10]; set log y; plot 1/x

I don't understand your example. The y axis range is auto-calculated
(correctly, it seems) as 0.1 to 1. There is no negative log range 
there, and the negative y-values associated with the x=[-10:0] range 
are ignored. If you try something like:

	gnuplot> set xrange [-10:10]; set yrange [-1:1]; set log y; plot 1/x;

You will, as expected, get the error "y range must be greater than 0 for
log scale." This seems to be the case in 4.2 as well.

Tait