The Agg backend is a non-gui backend, it just saves to file. The `TkAgg`
and `GtkAgg` are gui backends (which are more of front ends, but I digress)
which show the output of Agg in a gui window (and provide a layer for
handling user interaction).
I suspect that how ever your 1.3.1 was installed the system level
matplotlibrc file was modified to set the default backend to be one of the
GUI backends.
See http://matplotlib.org/users/customizing.html#the-matplotlibrc-file You
want to set the 'backend' parameter.
Tom
On Wed, Jul 15, 2015 at 10:22 AM John Coppens <j...@jcoppens.com> wrote:
> Hello all.
>
> I had MatPlotLib 1.3.1 installed, and decided to upgrade to 1.4.3. I
> compiled the
> .tar.gz package, which went without a hitch (except for a number of
> warnings
> from gcc). Installation also completed without problems.
>
> But, on running the same simple plot I was working on, no plot was output:
>
> import matplotlib.pyplot as plt
>
> def test_plot():
> x = range(11)
> y = [x0**2 for x0 in x]
>
> plt.plot(x, y, 'o:', fillstyle='none', label = "1", ms = 10)
> plt.legend()
> plt.show()
>
> def main(args):
> test_plot()
> return 0
>
> if __name__ == '__main__':
> import sys
> sys.exit(main(sys.argv))
>
> which was somewhat annoying, as I was trying to help out someone on
> Stackoverflow. Only after experimenting somewhat, I found that
> setting the Agg to GtkAgg, the plot started working again:
>
> import matplotlib
> matplotlib.use('GtkAgg')
>
> Is this normal? I'm not actually using gtk in this project.
> TkAgg also works.
>
> John
>
>
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