I forgot of the my image. On Fri, Jul 16, 2010 at 9:10 AM, Waléria Antunes David < waleriantu...@gmail.com> wrote:
> 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
>>
>
>
<<attachment: image.png>>
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