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From: Waléria Antunes David <waleriantunes@gm...>  20100715 13:48:27
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From: Benjamin Root <ben.root@ou...>  20100715 14:25:53
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On Thu, Jul 15, 2010 at 8:41 AM, Waléria Antunes David < waleriantunes@...> 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 × 106 GHz > 3400 Hz = 3,4 x 106 Ghz > > How do I make the graph xaxis is shown in figures > scientific notation, for this currently so > > 3000,3050,3100,....,3400 > > in scientific notation is: (3.0e6, 3.4e6) > > Can someone help me? > > See my attachment.... > > I need to show this values in scientific notation...... > > Waléria > > > Waleria, I believe you are looking to use the ticker API. Particularly the FormatStrFormatter that accepts a sprintf()like format string to express your tick values. For your particular example, off the top of my head the string format would be "%.1e". http://matplotlib.sourceforge.net/api/ticker_api.html I hope this helps. Ben Root 
From: Waléria Antunes David <waleriantunes@gm...>  20100715 14:32:36
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But, i don't know how do... I tried, but don't, most failed.... On Thu, Jul 15, 2010 at 11:25 AM, Benjamin Root <ben.root@...> wrote: > > On Thu, Jul 15, 2010 at 8:41 AM, Waléria Antunes David < > waleriantunes@...> 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 × 106 GHz >> 3400 Hz = 3,4 x 106 Ghz >> >> How do I make the graph xaxis is shown in figures >> scientific notation, for this currently so >> >> 3000,3050,3100,....,3400 >> >> in scientific notation is: (3.0e6, 3.4e6) >> >> Can someone help me? >> >> See my attachment.... >> >> I need to show this values in scientific notation...... >> >> Waléria >> >> >> > Waleria, > > I believe you are looking to use the ticker API. Particularly the > FormatStrFormatter that accepts a sprintf()like format string to express > your tick values. For your particular example, off the top of my head > the string format would be "%.1e". > > http://matplotlib.sourceforge.net/api/ticker_api.html > > I hope this helps. > > Ben Root > 
From: Friedrich Romstedt <friedrichromstedt@gm...>  20100717 20:38:35

2010/7/15 Waléria Antunes David <waleriantunes@...>: > But, i don't know how do... > > I tried, but don't, most failed.... Maybe this is something in the direction you want? You have to adapt the test file. Friedrich 
From: Ryan May <rmay31@gm...>  20100715 18:22:32

On Thu, Jul 15, 2010 at 8:41 AM, Waléria Antunes David <waleriantunes@...> 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 × 106 GHz > 3400 Hz = 3,4 x 106 Ghz > > How do I make the graph xaxis is shown in figures > scientific notation, for this currently so > > 3000,3050,3100,....,3400 > > in scientific notation is: (3.0e6, 3.4e6) 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 
From: Waléria Antunes David <waleriantunes@gm...>  20100716 12:11:02
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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 <rmay31@...> wrote: > On Thu, Jul 15, 2010 at 8:41 AM, Waléria Antunes David > <waleriantunes@...> 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 × 106 GHz > > 3400 Hz = 3,4 x 106 Ghz > > > > How do I make the graph xaxis is shown in figures > > scientific notation, for this currently so > > > > 3000,3050,3100,....,3400 > > > > in scientific notation is: (3.0e6, 3.4e6) > > 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 > 
From: Waléria Antunes David <waleriantunes@gm...>  20100716 12:11:47
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From: Benjamin Root <ben.root@ou...>  20100716 14:40:39
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Please attach the code you used to generate this image. Ben Root On Fri, Jul 16, 2010 at 7:11 AM, Waléria Antunes David < waleriantunes@...> wrote: > I forgot of the my image. > > > On Fri, Jul 16, 2010 at 9:10 AM, Waléria Antunes David < > waleriantunes@...> 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 <rmay31@...> wrote: >> >>> On Thu, Jul 15, 2010 at 8:41 AM, Waléria Antunes David >>> <waleriantunes@...> 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 × 106 GHz >>> > 3400 Hz = 3,4 x 106 Ghz >>> > >>> > How do I make the graph xaxis is shown in figures >>> > scientific notation, for this currently so >>> > >>> > 3000,3050,3100,....,3400 >>> > >>> > in scientific notation is: (3.0e6, 3.4e6) >>> >>> 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 >>> >> >> > > >  > This SF.net email is sponsored by Sprint > What will you do first with EVO, the first 4G phone? > Visit sprint.com/first  http://p.sf.net/sfu/sprintcomfirst > _______________________________________________ > Matplotlibusers mailing list > Matplotlibusers@... > https://lists.sourceforge.net/lists/listinfo/matplotlibusers > > 
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