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

[Friedrich R. <fri...@gm...>]

2010/10/19 Jonathan Slavin <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.

Okay thx

> 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))

typo for the records although abvious:  FuncFormatter

> plt.show()

Okay I can do the tedious work of changing my code ASAP but with low
priority ...

Friedrich