Re: [Matplotlib-users] FuncFormatter and Colorbar

[Michael D. <md...@st...>]

Thanks for the patch.  However, perhaps a more general solution would be 
to use the Python locale module to format numbers according to different 
locales.  And expose a kwarg select between the user's preferred locale, 
the current U.S. English-centric defaults as they are now, or an 
arbitrary locale using an ISO language code.  That seems like it could 
be a better long-term solution, since there are different number formats 
all over, not just in Germany.

All that said, internationalization is hard -- especially for us 
sheltered people in the U.S. where the defaults are most often correct. 
  I may be missing an important detail here.

Cheers,
Mike

Thorsten Kranz wrote:
> Hi list, Hi Matthias,
> 
> I found another way to deal with this problem. when defining the 
> colorbar, one can give an additional kwarg "format", so by defining the 
> kwarg "format=formatter", we solved the problem.
> 
> Anyway, I think an option as Matthias implemented would be very handy 
> for all those users like us here in Germany who might want to have the 
> numbers formatted with commata.
> 
> Greetings,
> Thorsten
> 
> 2008/1/9, Matthias Michler <Mat...@gm... 
> <mailto:Mat...@gm...>>:
> 
>     Hello list,
>     Hello Thorsten,
> 
>     On Wednesday 09 January 2008 11:38, Thorsten Kranz wrote:
>      > I have a question concerning reformatting of axis-ticks via the
>      > FuncFormatter-class. In german, it's common to use a comma as
>     separator for
>      > decimal numbers instead of a dot. To realize it in matplotlib, I do
>      > something like
>      >
>      > >from matplotlib.ticker import FuncFormatter
>      >
>      > import pylab
>      > pylab.figure()
>      > formatter = FuncFormatter(lambda x,pos: ("%.2f"%x).replace(".",","))
>      > ax = pylab.axes()
>      > ax.xaxis.set_major_formatter(formatter)
>      > ax.yaxis.set_major_formatter(formatter)
>      > ax.plot(pylab.arange(0,1,0.1),pylab.arange(0,1,0.1))
>      > This works fine for me,
> 
>     I had the same idea ;-). The problem is that you have a fixed number
>     of digits
>     behind the comma, which is not the desirable behaviour during zoom.
>     I changed the ticker.py/ axes.py files to circumwait this
>     disadvantage. I
>     attached a patch showing my changes and maybe somebody can test it.
>     You can activate it using:
>       ax.ticklabel_format(style='comma')
>     for an ScalarFormatter
> 
>      > but I encounter a problem when I do an
>      > imshow-command with a colorbar. In the imshow-axes, it's o.k.,
>     but for the
>      > colorbar it doesn't really work. I do
>      >
>      > cb = pylab.colorbar()
>      > cb.ax.yaxis.set_major_formatter(formatter)
>      >
>      > and, actually, all dots are replaced by com9mata, but the values
>     are also
>      > changed! E.g. instead of the old values (without formatter) from
>     0-0.54,
>      > the
>      >
>      > values are increased to 0-0.95.
>     [...]
>      > Can anyone explain why it doesn't work out as I expect it to work?
>     I don't know were the problem comes from. I attached your example in
>     a slitly
>     modified version and this shows that the problem is not due to your
>     special
>     formatting. It occurs with matplotlib.ticker.ScalarFormatter, too.
> 
>     best regards,
>     Matthias
> 
>      > Or is there a better, more standard way to substitute the dots by
>     commata?
>      >
>      > Thanks,
>      > Thorsten
> 
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-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA