On Thu, Jul 15, 2010 at 8:41 AM, Waléria Antunes David
<waleriantu...@gmail.com> wrote:
> Hi all,
>
> I have a code base so that:
>
>
> from pylab import *
> x = arange (3000,3400)
> y = -108 * (3.0e14 ** 2)/x**2
>
> pylab..title("Teste")
> pylab.savefig("imagem.png")
> plot(x, y)
>
>
> Well.... the values of the function range(3000,3400) are in Hz......i need
> to pass GHz which would be in scientific notation as follows bellow:
>
> 3000 Hz = 3,0 × 10-6 GHz
> 3400 Hz = 3,4 x 10-6 Ghz
>
> How do I make the graph x-axis is shown in figures
> scientific notation, for this currently so
>
> 3000,3050,3100,....,3400
>
> in scientific notation is: (3.0e-6, 3.4e-6)
One way is to just change the values in the GHz and plot them:
plot(x/1e9, y)
# Need to change some limits so that they show up in scientific notation:
gca().xaxis.get_major_formatter().set_powerlimits((-5,5))
The other way is make a custom formatter that changes the values of the ticks:
def fmt_ghz(val, pos=None):
return '%g' % (val / 1e9)
plot(x, y)
gca().xaxis.set_major_formatter(FuncFormatter(fmt_ghz))
You can get more information here:
http://matplotlib.sourceforge.net/api/ticker_api.html
Ryan
--
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma
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