Re: [Matplotlib-users] DIscretization of colorbar

[Eric F. <ef...@ha...>]

Claas Teichmann wrote:
> Hi Eric,
> 
> Great that it works!! This is what I was looking for!
> 
> There is one thing left, which is that the tick labels are not exactly
> at the boundary between the colors. (It is no problem for me, but I am
> interested where it comes from). The script below shows that the
> colorswitch is not exactly at an "even" number. The values
> -0.022000001 and -0.022 are colored with the same color, whereas
> -0.02200001 has a different color. I don't know whether this is the
> reason for the ticks not beeing exactly at the intersection..?

When I run the script below I don't see what you are describing above; 
but I may not be looking in the right place, and it would not surprise 
me if there are little anomalies like this, because we are dealing with 
floating point arithmetic.

I do see (and had noticed before) that the colorbar ticks look a tiny 
bit high.  I don't know whether this is a bug or whether it is a 
consequence of the fact that colors are assigned to ranges that include 
the lower limit but not the upper limit, and/or floating point 
arithmetic, and/or the resolution of the display.  Or it may be because 
of some floating point fudge factors that I put into the colorbar code. 
  Maybe these could be improved.

Eric