Hi...
I tried the first option, but failed.... see my image attached
And the second option, i don't understand the variable 'val'
...?
On Thu, Jul 15, 2010 at 3:22 PM, Ryan May <rma...@gmail.com> wrote:
> 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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