Re: tests in log-scale plots

[c.]

On 7 Sep 2011, at 02:30, Ben Abbott wrote:

> Just for clarity, I ran this in Matlab and attached a plot 
> (loglog-demo-2.dpf).
> I noticed that 'ydir', isn't reversed. Instead Matlab made some bizarre 
> choices.

on my system with matlab 2007b I see the plot in the attache screenshot, 
the y axis is indeed reversed.

the plot in figure 1 (right) is obtained by 

a = logspace (-5, 1, 10);
b =-logspace (-5, 1, 10);
loglog (a, b)   

the plot in figure 2 (left) by

loglog (a, abs(b))
set (gca, 'ydir', 'reverse')  

to me they look the same except for the sign of the yticklabels, don't they?

> get (gca, 'ytick')

> ans =
>  -10.0000   -1.0000   -0.1000   -0.0100   -0.0010   -0.0001   -0.0000

so it seems the ytick labels are consistent with the y tick values.

c.