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[Matplotlib-users] How to show separate legend for each subplot

From: Omer Khalid <Omer.Khalid@ce...> - 2010-03-31 13:20

Attachments: Message as HTML

Hi,

I am wondering is there a way one could show a separate legend for each
subplot in a figure? I would really really appreciate any ideas on this.

Thanks,
Omer

Re: [Matplotlib-users] How to show separate legend for each subplot

From: <PHobson@Ge...> - 2010-03-31 15:43

From: Omer Khalid [mailto:Omer.Khalid@...] 
Sent: Wednesday, March 31, 2010 6:20 AM
To: Matplotlib Users
Subject: [Matplotlib-users] How to show separate legend for each subplot

Hi, 

I am wondering is there a way one could show a separate legend for each subplot in a figure? I would really really appreciate any ideas on this.
`~~~~~~~~~~~~~~~~~~~~~~~~~'

Omer,

Give this a shot:
# code --------->
import matplotlib.pyplot as pl
fig = pl.figure()
ax1 = fig.add_subplot(1,2,1)
ax2 = fig.add_subplot(1,2,2)

ax1.plot([1,2], [3,4], 'ko', label='First Axes')
ax2.plot([2,3], [4,5[, 'bs', label='Second Axes')

ax1.legend()
ax2.legend()
# <------------- code

There's also an example in the Examples section of the MPL website:
http://matplotlib.sourceforge.net/examples/pylab_examples/legend_demo3.html

Hope that helps,
-paul

Re: [Matplotlib-users] How to show separate legend for each subplot

From: Omer Khalid <Omer.Khalid@ce...> - 2010-03-31 16:21

Attachments: Message as HTML

Hi Paul,

Thanks for your prompt response. It did help :)

But it seems that axis don't seems to accept title, xlable and ylable values
any more. Any ideas on that?

Cheers
Omer

On Wed, Mar 31, 2010 at 17:43, <PHobson@...> wrote:

> From: Omer Khalid [mailto:Omer.Khalid@...]
> Sent: Wednesday, March 31, 2010 6:20 AM
> To: Matplotlib Users
> Subject: [Matplotlib-users] How to show separate legend for each subplot
>
> Hi,
>
> I am wondering is there a way one could show a separate legend for each
> subplot in a figure? I would really really appreciate any ideas on this.
> `~~~~~~~~~~~~~~~~~~~~~~~~~'
>
> Omer,
>
> Give this a shot:
> # code --------->
> import matplotlib.pyplot as pl
> fig = pl.figure()
> ax1 = fig.add_subplot(1,2,1)
> ax2 = fig.add_subplot(1,2,2)
>
> ax1.plot([1,2], [3,4], 'ko', label='First Axes')
> ax2.plot([2,3], [4,5[, 'bs', label='Second Axes')
>
> ax1.legend()
> ax2.legend()
> # <------------- code
>
> There's also an example in the Examples section of the MPL website:
> http://matplotlib.sourceforge.net/examples/pylab_examples/legend_demo3.html
>
> Hope that helps,
> -paul
>

Re: [Matplotlib-users] How to show separate legend for each subplot

From: Ryan May <rmay31@gm...> - 2010-03-31 17:00

On Wed, Mar 31, 2010 at 10:21 AM, Omer Khalid <Omer.Khalid@...> wrote:
> Hi Paul,
> Thanks for your prompt response. It did help :)
> But it seems that axis don't seems to accept title, xlable and ylable values
> any more. Any ideas on that?

If you're trying to use the functions plt.title() and plt.xlabel(),
they only work on the current axes object (basically, the most
recently created one).  You'll want to try to use methods on the axes
themselves:

ax1.set_title('ax1 title')
ax1.set_xlabel('xlabel')

ax2.set_title('ax2 title')
ax2.set_xlabel('xlabel')

Ryan

> On Wed, Mar 31, 2010 at 17:43, <PHobson@...> wrote:
>>
>> From: Omer Khalid [mailto:Omer.Khalid@...]
>> Sent: Wednesday, March 31, 2010 6:20 AM
>> To: Matplotlib Users
>> Subject: [Matplotlib-users] How to show separate legend for each subplot
>>
>> Hi,
>>
>> I am wondering is there a way one could show a separate legend for each
>> subplot in a figure? I would really really appreciate any ideas on this.
>> `~~~~~~~~~~~~~~~~~~~~~~~~~'
>>
>> Omer,
>>
>> Give this a shot:
>> # code --------->
>> import matplotlib.pyplot as pl
>> fig = pl.figure()
>> ax1 = fig.add_subplot(1,2,1)
>> ax2 = fig.add_subplot(1,2,2)
>>
>> ax1.plot([1,2], [3,4], 'ko', label='First Axes')
>> ax2.plot([2,3], [4,5[, 'bs', label='Second Axes')
>>
>> ax1.legend()
>> ax2.legend()
>> # <------------- code
>>
>> There's also an example in the Examples section of the MPL website:
>>
>> http://matplotlib.sourceforge.net/examples/pylab_examples/legend_demo3.html
>>
>> Hope that helps,
>> -paul
>
>
> ------------------------------------------------------------------------------
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>
>




-- 
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma

[Matplotlib-users] How to show last value on the line

From: Omer Khalid <Omer.Khalid@ce...> - 2010-03-31 13:14

Attachments: Message as HTML

Hi,

I have produced number of charts in my research thesis. On any given chart,
there are number of lines. I would like to display the last value on each
line to show at which precise value it's ending.

Thanks,
Omer

Re: [Matplotlib-users] How to show last value on the line

From: <PHobson@Ge...> - 2010-03-31 15:45

From: Omer Khalid [mailto:Omer.Khalid@...] 
Sent: Wednesday, March 31, 2010 6:14 AM
To: Matplotlib Users
Subject: [Matplotlib-users] How to show last value on the line

Hi, 

I have produced number of charts in my research thesis. On any given chart, there are number of lines. I would like to display the last value on each line to show at which precise value it's ending.

Thanks,
Omer
~~~~~~~~~~~~~~~~~~~~

Omer, 
Give something like this a shot:
http://matplotlib.sourceforge.net/examples/pylab_examples/annotation_demo.html

Remember that in python you can easily access the last element of an array (x) with x[-1].

[Matplotlib-users] Problem in background image and curve plotted in it

From: yogesh karpate <yogeshkarpate@gm...> - 2010-03-31 09:08

Attachments: Message as HTML a3.png deformed.png

[Matplotlib-users] Fwd: Problem in background image and curve plotted in it

From: yogesh karpate <yogeshkarpate@gm...> - 2010-03-31 09:12

Attachments: Message as HTML a3.png

Re: [Matplotlib-users] Fwd: Problem in background image and curve plotted in it

From: Matthias Michler <MatthiasMichler@gm...> - 2010-03-31 11:46

Attachments: background_image.py deformed.png

On Wednesday 31 March 2010 11:11:58 yogesh karpate wrote:
> Sorry if this mail is resent again!!!!!!
> ---------- Forwarded message ----------
> From: yogesh karpate <yogeshkarpate@...>
> Date: Wed, Mar 31, 2010 at 2:38 PM
> Subject: Problem in background image and curve plotted in it
> To: matplotlib-users@...
>
>
> Dear All,
>                Currently I'm facing one problem. I have image of 230X135 as
> attched in this mail. I have dataset of 700 samples . and i want to plot
> this data on that image. But only 235 points are plotted properly and other
> points are plotted outside the image. If I scale xaxis that while plotting
> (x/4(or 5),y)
> it plots all data but curve on the image is deformed.
> Code is as following
[snip]
>
> Thanks in advance!!!!!!!!
> Regards
> Yogesh

Hi Yogesh,

attached you find a minimal example of what I think you want to do and the 
resulting image.

Kind regards,
Matthias

PS: You should try to simplify and shorten your code as far as possible, 
because typically people don't want to spend a lot of time to go through your 
script. A small stand-alone example, which illustrates the problem is a good 
starting point for others.

Re: [Matplotlib-users] permille sign in labels

From: Nils Wagner <nwagner@ia...> - 2010-03-31 08:30

On Wed, 24 Mar 2010 10:14:29 -0400
  Michael Droettboom <mdroe@...> wrote:
> You can use Unicode.
> 
>  ylabel(u'\u2030')
> 
> http://www.unicode.org/charts/charindex.html
> 
> Mike

Degree Celsius u'\u2103' doesn't work.

/usr/local/lib64/python2.4/site.packages/matplotlib/mathtext.py:722: 
MathTextWarning: Unrecognized symbol '\u2103'.
Substituting with a dummy symbol.

How can I resolve the problem ?

Nils

[Matplotlib-users] How to save file in to image in desired resolution in matplotlib?

From: yogesh karpate <yogeshkarpate@gm...> - 2010-03-31 07:24

Attachments: Message as HTML

Dear All,
               I am using one image of 235X130 and plotting the curve on it,
now when i save it it goes  in the resoltuion  of 800X600,
I want to keep the resolution intact.What can be done for that to keep the
resolution same?
I am using
savefig('/home/jaguar/Softwares/Development/Python/bunty.png')
Thanks in advance!
Regards
Yogesh

Re: [Matplotlib-users] How to save file in to image in desired resolution in matplotlib?

From: Matthias Michler <MatthiasMichler@gm...> - 2010-03-31 07:48

On Wednesday 31 March 2010 09:24:10 yogesh karpate wrote:
> Dear All,
>                I am using one image of 235X130 and plotting the curve on
> it, now when i save it it goes  in the resoltuion  of 800X600,
> I want to keep the resolution intact.What can be done for that to keep the
> resolution same?
> I am using
> savefig('/home/jaguar/Softwares/Development/Python/bunty.png')
> Thanks in advance!
> Regards
> Yogesh

Hi Yogesh,

You can adjust the resolution by changing the figure size and the dpi in 
savefig.

Keyword of figure:
 *figsize* width x height in inches; defaults to rc figure.figsize

Keyword of savefig:
  *dpi*: [ None | scalar > 0 ]
            The resolution in dots per inch.  If *None* it will default to
            the value ``savefig.dpi`` in the matplotlibrc file.

e.g.
import matplotlib
matplotlib.use('Agg')
from matplotlib import pyplot as plt

# aim: 235X130
fig = plt.figure(figsize=(23.5, 13.0))
ax = plt.axes([0.0, 0.0, 1.0, 1.0])
ax.plot([1, 2, 4], lw=5)
ax.set_xticks([])
ax.set_yticks([])

fig.savefig('test.png', dpi=10)

Kind regards,
Matthias

[Matplotlib-users] field plot with null clines

From: Alan G Isaac <aisaac@am...> - 2010-03-31 02:54

To get a field plot with null clines,
I'm using the approach John illustrated here:
http://mail.scipy.org/pipermail/scipy-user/2007-October/014290.html

Is this the recommended approach these days?

Thanks,
Alan Isaac

Re: [Matplotlib-users] Shifting the Origin

From: Ryan May <rmay31@gm...> - 2010-03-31 01:19

(Putting back on list)

On Tue, Mar 30, 2010 at 5:06 PM, Rachel-Mikel Arce Jaeger
<Rachel-Mikel_ArceJaeger@...> wrote:
> I see. I think utilizing the backend will be sufficient for now. One more question (and thank you so much for your help!). Switching the xaxis to the top crushes it into the title, but adding more linespace to the title causes the title to go off the canvas. I really want to either resize the canvas or shift the figure down, but all I can find are functions for resizing the figure, which causes resolution issues. Are there any calls that let me shift to location of the figure on the canvas or else resize the canvas in relation to the figure?

You're looking for the subplots_adjust() method of the figure class.
You don't have to manually create a figure, as one is created for you
when you start calling pyplot functions. But it's useful to be able to
get to the object sometimes.

# At the beginning, before any plotting
fig = plt.figure()

#OR at some point during/after plotting, before show()
fig = plt.gcf()

# Gives margins in normalized figure coordinates, so 0.0 represents
very bottom, 1.0 represents very top.
fig.subplots_adjust(top=0.85)

Hope that helps,

Ryan

-- 
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma