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)
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
···
On Thu, Jul 15, 2010 at 8:41 AM, Waléria Antunes David <waleriantunes@…287…> 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)
Can someone help me?
See my attachment…
I need to show this values in scientific notation…
Waléria
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@…1304…> wrote:
On Thu, Jul 15, 2010 at 8:41 AM, Waléria Antunes David <waleriantunes@…287…> 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)
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
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
···
On Thu, Jul 15, 2010 at 8:41 AM, Waléria Antunes David <waleriantunes@...287...> 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)
--
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma
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@…287…> wrote:
On Thu, Jul 15, 2010 at 8:41 AM, Waléria Antunes David > > <waleriantunes@…287…> 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
I forgot of the my image.
···
On Fri, Jul 16, 2010 at 9:10 AM, Waléria Antunes David <waleriantunes@…287…> 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@…287…> wrote:
On Thu, Jul 15, 2010 at 8:41 AM, Waléria Antunes David > > > > <waleriantunes@…287…> 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
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@…287…> wrote:
I forgot of the my image.
On Fri, Jul 16, 2010 at 9:10 AM, Waléria Antunes David <waleriantunes@…287…> 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@…287…> wrote:
On Thu, Jul 15, 2010 at 8:41 AM, Waléria Antunes David > > > > > > <waleriantunes@…287…> 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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2010/7/15 Waléria Antunes David <waleriantunes@...287...>:
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
embedded_sci_formatter.py (794 Bytes)
test.py (440 Bytes)
