not compatible with latest matplotlib version

[twmr]

I get the following exception when i try to execute (matplotlib version: 1.4/1.5.dev)

using PyPlot
x = linspace(0,2*pi,1000)
y = sin(3*x + 4*cos(2*x))
plot(x, y, color="red", linewidth=2.0, linestyle="--")

PyError (PyObject_Call) <type 'exceptions.TypeError'>
TypeError('Julia exception: TypeError(:draw_if_interactive,"if",Bool,0)',)
  File "/home/thomas/.local/lib/python2.7/site-packages/matplotlib-1.5.x-py2.7-linux-x86_64.egg/matplotlib/pyplot.py", line 3086, in plot
    ax = gca()
  File "/home/thomas/.local/lib/python2.7/site-packages/matplotlib-1.5.x-py2.7-linux-x86_64.egg/matplotlib/pyplot.py", line 827, in gca
    ax =  gcf().gca(**kwargs)
  File "/home/thomas/.local/lib/python2.7/site-packages/matplotlib-1.5.x-py2.7-linux-x86_64.egg/matplotlib/pyplot.py", line 461, in gcf
    return figure()
  File "/home/thomas/.local/lib/python2.7/site-packages/matplotlib-1.5.x-py2.7-linux-x86_64.egg/matplotlib/pyplot.py", line 450, in figure
    draw_if_interactive()

while loading In[1], in expression starting on line 4

 in pyerr_check at /home/thomas/.julia/PyCall/src/exception.jl:58
 in pycall at /home/thomas/.julia/PyCall/src/PyCall.jl:85
 in plot at /home/thomas/.julia/PyPlot/src/PyPlot.jl:290

[stevengj]

This almost looks like pyplot.isinteractive() is returning 0 instead of a boolean value, or that PyCall is getting confused and converting to an integer for some reason. Check whether

using PyPlot
PyPlot.pltm[:isinteractive]()

returns a boolean.

A workaround would be to change line 168 of PyPlot.jl, in the definition of draw_if_interactive, from pltm[:isinteractive]() to pycall(pltm["isinteractive"], Bool).

[twmr]

Yes, it is indeed returning 0 (mpl 1.4) and true (mpl 1.3).

With your proposed workaround the exception is no longer thrown. However, no graph gets drawn in the notebook.

Here is my patch:

--- a/src/PyPlot.jl
+++ b/src/PyPlot.jl
@@ -162,13 +162,14 @@ svg(b::Bool) = (SVG[1] = b)

 Base.isempty(f::Figure) = isempty(pycall(f["get_axes"], PyVector))

 function draw_if_interactive()
     if isjulia_display[1]
-        if pltm[:isinteractive]()
+        if pycall(pltm["isinteractive"], Bool)
             manager = Gcf[:get_active]()
             if manager != nothing
                 fig = Figure(manager["canvas"]["figure"])

[stevengj]

If it is returning 0 then there are two problems. First, it is returning an integer for some reason, although my suggestion above works around this. Second, the integer 0 corresponds to false so it doesn't think it is in interactive mode...

[stevengj]

What operating system are you using? If you are on Linux, can you try using PyCall; pygui(:gtk); using PyPlot?

[dpsanders]

I was just about to report the same error... On MacOS. The above command you asked for returns 0.

PyError (PyObject_Call) <class 'TypeError'>
TypeError('Julia exception: TypeError(:draw_if_interactive,"if",Bool,0)',)
  File "/usr/local/Cellar/python3/3.4.1_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/matplotlib/pyplot.py", line 3086, in plot
    ax = gca()
  File "/usr/local/Cellar/python3/3.4.1_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/matplotlib/pyplot.py", line 827, in gca
    ax =  gcf().gca(**kwargs)
  File "/usr/local/Cellar/python3/3.4.1_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/matplotlib/pyplot.py", line 461, in gcf
    return figure()
  File "/usr/local/Cellar/python3/3.4.1_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/matplotlib/pyplot.py", line 450, in figure
    draw_if_interactive()

while loading In[3], in expression starting on line 1

 in pyerr_check at /Users/dsanders/.julia/v0.3/PyCall/src/exception.jl:58
 in pycall at /Users/dsanders/.julia/v0.3/PyCall/src/PyCall.jl:85
 in plot at /Users/dsanders/.julia/v0.3/PyPlot/src/PyPlot.jl:290

Julia Version 0.3.1-pre+39
Commit 1c757b1* (2014-08-26 20:37 UTC)
Platform Info:
  System: Darwin (x86_64-apple-darwin13.1.0)
  CPU: Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz
  WORD_SIZE: 64
  BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Sandybridge)
  LAPACK: libopenblas
  LIBM: libopenlibm
  LLVM: libLLVM-3.3

[twmr]

I'm using Linux. No window pops up if i set the backend to 'gtk' and call plot.

[stevengj]

Are you running in IJulia or the REPL?

[twmr]

IJulia - I started IJulia from the REPL. (notebook())

[stevengj]

No window should pop up in IJulia unless you do pygui(true). Can you try it from the REPL?

[twmr]

pygui(true) has no effect.

julia> using PyPlot; pygui(true); plot(1:10)
INFO: Loading help data...
1-element Array{Any,1}:
 PyObject <matplotlib.lines.Line2D object at 0xa5e6150>  -> no window 

same with gtk backend (after a restart of julia):

julia> using PyCall; pygui(:gtk); using PyPlot; plot(1:10)
INFO: Loading help data...
1-element Array{Any,1}:
 PyObject <matplotlib.lines.Line2D object at 0x147a0fd0> -> no window

I also tried this

julia> using PyCall; pygui(:gtk); using PyPlot; pygui(true); plot(1:10)
INFO: Loading help data...
1-element Array{Any,1}:
 PyObject <matplotlib.lines.Line2D object at 0xa7fa250> -> no window

[freddycct]

I face the same problem, can please submit a fix soon?

[twmr]

I applied it to the code in .julia/PyPlot/... However, it still does not work
even with this patch.

On Thu, Aug 28, 2014 at 7:35 PM, Freddy Chua notifications@github.com
wrote:

I face the same problem, how do I apply the patch?

—
Reply to this email directly or view it on GitHub
#79 (comment).

[freddycct]

help... i updated matplotlib to 1.4 through homebrew on osx, now i cannot revert back to the old 1.3 and pyplot does not work as a result..

[dpsanders]

Maybe try uninstalling the brew one and then install 1.3 with pip:

pip install matplotlib==1.3.1

I had success with Python 2.7.8 and the corresponding pip installed from homebrew, and then the above pip command for matplotlib.

[dpsanders]

(after messing around with a lot of other combinations, none of which worked...)

[freddycct]

well, I removed the homebrew matplotlib 1.4, I am not able to get back the 1.3 version on homebrew, so i eventually install matplotlib using 1.3

I still hope stevengj quickly update PyPlot so that we can use it with matplotlib 1.4

[manuamador]

Same here, when using plot, a julia exec instance appears on OS X dock. But no GUI (forget the first error line in the capture above, I am not really awake this morning)
I reinstalled, PyQt, PySide first, to be sure...
But "savefig(filename)" works so I can check some png pictures of my work, but no zooming, panning through the plots...

[ackalker]

I'm having the same issue. If it is of any help (I believe in going back to basics to diagnose stuff), the simple matplotlib tutorial at http://nbviewer.ipython.org/github/jrjohansson/scientific-python-lectures/blob/master/Lecture-4-Matplotlib.ipynb works with IPython (using the 'python' profile of course) and this new matplotlib version.

Using Arch Linux x86_64, python 3.4.1-1, python-matplotlib 1.4.0-1, i see:

In [1]: %matplotlib inline
In [2]: from pylab import *
In [3]: x = linspace(0, 5, 10)
        y = x ** 2
        figure()
        plot(x, y, 'r')
        xlabel('x')
        ylabel('y')
        title('title')
        show()

(plot is shown inline)

In [6]: mpl.is_interactive()
Out[6]: True

[stevengj]

This seems to have gotten broken by matplotlib/matplotlib#2286 (subsequently further modified by matplotlib/matplotlib#2503). Basically, Matplotlib refuses to enable interactive mode because it thinks that Python is non-interactive.

@mdboom, the difficulty with these patches is that they assume that Matplotlib can only be used interactively via the python executable, whereas we are calling it via libpython in Julia.

A workaround would be for PyPlot to set sys.flags.interactive manually when it is loaded, but unfortunately it seems that the sys.flags.interactive attribute is read-only.

[stevengj]

Looks like a workaround is for me to manually set sys.ps1 when PyPlot is loaded (before loading Matplotlib). A bit ugly, but it seems to work.

[gasagna]

Thanks, works like a charm now..

[manuamador]

Thanks.