Re: [Matplotlib-users] scientific notation in ticklabels for linear plot

[Jonathan S. <js...@cf...>]

I think that'd be fine -- i.e. the option of \cdot or \times (though in
the gmane preview the dot looks a bit low).  In the mean time, I came up
with the method below that worked for my purpose.

Jon


import matplotlib.pyplot as plt
import numpy as np
from matplotlib.ticker import FuncFormatter

def scinot(x,pos=None):
    if x == 0:
        s = '0'
    else:
        xp = int(np.floor(np.log10(np.abs(x))))
        mn = x/10.**xp
        # Here we truncate to 2 significant digits -- may not be enough 
        # in all cases
        s = '$'+str('%.1f'%mn) +'\\times 10^{'+str(xp)+'}$'
    return s

x = np.linspace(0.,2.,10)*1.E18
y = 2.*(x/1.E18) - 1.
fig = plt.figure()
ax = fig.add_subplot(111)
ax.plot(x,y)
ax.xaxis.set_major_formatter(FucFormatter(scinot))
plt.show()


On Tue, 2010-10-19 at 15:30 -0400, David Pine wrote:
> I like the times symbol but others prefer the dot (which I missed in the gmane preview!).  So I like your suggestion of providing an option to use either \cdot or \times.
> 
> David
> 
> On Oct 19, 2010, at 3:23 PM, Friedrich Romstedt wrote:
> 
> > What about inserting \cdot, that's the scientific notation I do prefer?
> > 
> > If I'm not mistaken that's what I did that time, might be unreadable
> > in the preview?  I checked, when you look close you see the dot in
> > gmane preview.
> > 
> > We can make this customisable, with \times as an alternative option.
> > 
> > Friedrich
> 
-- 
______________________________________________________________
Jonathan D. Slavin              Harvard-Smithsonian CfA
js...@cf...         60 Garden Street, MS 83
phone: (617) 496-7981           Cambridge, MA 02138-1516
 cell: (781) 363-0035           USA
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