matplotlib-users Mailing List for matplotlib

Can you please provide a complete, minimal and self-contained script 
that reproduces the error? The example below has many undefined 
variables etc.
Cheers,
Mike
On 04/16/2013 07:09 PM, Christophe Pettus wrote:
> # preamble code collecting data
>
> ind = np.arange(len(table_name))
> 
> width = 0.35
> 
> fig = plot.figure(figsize=DEFAULT_FIGURE_SIZE)
> ax = fig.add_subplot(111, axisbg='#fafafa', alpha=0.9)
> 
> ax.set_title('Largest Tables')
> 
> ax.set_xlabel('Size (log scale)')
> 
> ax.set_xscale('log')
> ax.grid(True)
> 
> ax.xaxis.set_major_formatter(FuncFormatter(magnitude_ticks))
>
> dbar = ax.barh(ind, data_size, width, linewidth=0, color='blue', label='Main Data') # exception here
> ibar = ax.barh(ind, index_toast_size, width, left=data_size, linewidth=0, color='red', label='Toast/Indexes')
> ax.set_yticks(ind + width/2)
> ax.set_yticklabels(table_name, fontproperties=xx_small_font)
>
> ax.legend(loc='lower right', prop=x_small_font)
>
> plot.tight_layout()
> 
> plot.savefig(REPORT_DIR_PATH + '/table_sizes.pdf')
>
> plot.close()

On Thu, Apr 18, 2013 at 3:34 AM, John Ladasky <joh...@sb...>wrote:
> Hello everyone,
>
> After not using Matplotlib for over a year, I'm returning to it.
> Meanwhile, I have upgraded from Python 2.7 to Python 3.2, and I want to
> do all of my software development in Python 3 from now on.
>
> My OS is Ubuntu 12.04.1. Python 2.7 is still the default Python for
> Ubuntu, and many of the Python 3 packages are not offered as official
> repositories yet. I downloaded Matplotlib 1.2.1, then built it using
> Python 3. Eventually, I got no build error messages, and proceeded to
> install. (I always have to pick through dependency problems one error
> message at a time. I wish there was a better way. The Matplotlib docs
> could be a little better in this respect.)
>
> When I open a Python3 interpreter, I can import matplotlib. But I am
> not seeing ANYTHING with commands like plt.show(). It executes, and
> then returns. No output is generated.
>
> This very short and simple test program of mine used to produce output
> with Python 2.7 and Matplotlib 1.1.0. But with Python 3 and Matplolib
> 1.2.1, I am getting nothing...
>
> import numpy as np
> import matplotlib.pyplot as plt
>
> x = np.arange(0, 5, 0.1);
> y = np.sin(x)
> plt.plot(x, y)
> plt.show()
>
> It runs. No error messages are generated. But I don't get a graph. I
> don't even see a graph flicker on to the screen and disappear an instant
> later.
>
> Any advice will be appreciated!
>
>
You will need to make sure you install the gtk packages (both the libraries
and the dev packages) *before* building from source. If it can't find the
dev packages, then it won't build the interactive backend for it. I can't
remember if there are python3 specific packages for gtk (or any other gui
for that matter).

Hi John,
2013年4月18日 John Ladasky <joh...@sb...>
> On 04/18/2013 01:01 AM, Francesco Montesano wrote:
>
>> does plt.savefig('test.png') work?
>>
> Yes, it does! Thank you, that was a useful hint.
Good, than I would say that is a clear sign that you have a non interactive
backend.
Can you please give use the output of plt.get_backend() ?
>
> If the figure get saved, it can be that you are using a non interactive
>> backend
>>
> Ugh, the one thing that I never understood about Matplotlib was backends.
> So, what am I missing? (Whatever I am missing now, I had it working a
> year ago when I was using matplotlib 1.1.0 on Python 2.7.)
>
This link http://matplotlib.org/faq/usage_faq.html#what-is-a-backend should
explain you what a backend is.
If you want to use always a specific backend, you should select it in the
matplotlibrc file
You should have a line like this
#backend : TkAgg
Just uncomment it and put the backend that you want to use
> I have also just tried ipython3. Nothing that I do in the live
> interpreter displays any graphs.
>
>
That is not surprising: if matplotlib doesn't use an interactive backend,
you can't show the figures, whatever interpreter you use.
I hope that now is clearer,
Fra
ps: try to remember to reply to the list :D

Hi John,
does plt.savefig('test.png') work?
If the figure get saved, it can be that you are using a non interactive
backend
Cheers
Fra
2013年4月18日 John Ladasky <joh...@sb...>
> Hello everyone,
>
> After not using Matplotlib for over a year, I'm returning to it.
> Meanwhile, I have upgraded from Python 2.7 to Python 3.2, and I want to
> do all of my software development in Python 3 from now on.
>
> My OS is Ubuntu 12.04.1. Python 2.7 is still the default Python for
> Ubuntu, and many of the Python 3 packages are not offered as official
> repositories yet. I downloaded Matplotlib 1.2.1, then built it using
> Python 3. Eventually, I got no build error messages, and proceeded to
> install. (I always have to pick through dependency problems one error
> message at a time. I wish there was a better way. The Matplotlib docs
> could be a little better in this respect.)
>
> When I open a Python3 interpreter, I can import matplotlib. But I am
> not seeing ANYTHING with commands like plt.show(). It executes, and
> then returns. No output is generated.
>
> This very short and simple test program of mine used to produce output
> with Python 2.7 and Matplotlib 1.1.0. But with Python 3 and Matplolib
> 1.2.1, I am getting nothing...
>
> import numpy as np
> import matplotlib.pyplot as plt
>
> x = np.arange(0, 5, 0.1);
> y = np.sin(x)
> plt.plot(x, y)
> plt.show()
>
> It runs. No error messages are generated. But I don't get a graph. I
> don't even see a graph flicker on to the screen and disappear an instant
> later.
>
> Any advice will be appreciated!
>
>
>
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Hello everyone,
After not using Matplotlib for over a year, I'm returning to it. 
Meanwhile, I have upgraded from Python 2.7 to Python 3.2, and I want to 
do all of my software development in Python 3 from now on.
My OS is Ubuntu 12.04.1. Python 2.7 is still the default Python for 
Ubuntu, and many of the Python 3 packages are not offered as official 
repositories yet. I downloaded Matplotlib 1.2.1, then built it using 
Python 3. Eventually, I got no build error messages, and proceeded to 
install. (I always have to pick through dependency problems one error 
message at a time. I wish there was a better way. The Matplotlib docs 
could be a little better in this respect.)
When I open a Python3 interpreter, I can import matplotlib. But I am 
not seeing ANYTHING with commands like plt.show(). It executes, and 
then returns. No output is generated.
This very short and simple test program of mine used to produce output 
with Python 2.7 and Matplotlib 1.1.0. But with Python 3 and Matplolib 
1.2.1, I am getting nothing...
import numpy as np
import matplotlib.pyplot as plt
x = np.arange(0, 5, 0.1);
y = np.sin(x)
plt.plot(x, y)
plt.show()
It runs. No error messages are generated. But I don't get a graph. I 
don't even see a graph flicker on to the screen and disappear an instant 
later.
Any advice will be appreciated!