[julia-users] Simple PyPlot Animation fails in IJulia

[Thomas Moore]

I want to run a very simple animation using PyPlot: I use a for loop to 
cycle through many different pieces of data, and in each iteration I clear 
a plot, plot a new figure, and pause for, say, 0.01 seconds. For instance, 
here's a very simple example, where I attempt to animate a sine wave with 
increasing amplitude:


using PyPlot

#Generate Data
T = zeros(100,100)
x = linspace(0,2*pi,100)

for i = 1:100
    T[:,i] = i/100*sin(x)
end

#Plot Data
for i = 1:100
    cla()
    axis([0,2pi,-1,1])
    plot(x,T[:,i])
    pause(0.01)
end


This works reasonably well if I copy and paste it straight into the REPL 
(though there is some lag) , but if I run it using IJulia I get some 
problems. If I have set

pygui(false)

then no animation is shown, and I only see the final figure after a few 
seconds (presumably after the loop has finished), and if I have set:

pygui(true)

then it plots the first image, but then gives the following error:


PyError (:PyObject_Call) <type 'exceptions.RuntimeError'>
RuntimeError('Julia exception: ErrorException("function display_figs does not 
accept keyword arguments")',)
  File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 188, in pause
    show(block=False)

while loading In[45], in expression starting on line 9

 in pyerr_check at /home/thomas/.julia/v0.3/PyCall/src/exception.jl:58
 in pycall at /home/thomas/.julia/v0.3/PyCall/src/PyCall.jl:91
 in pause at /home/thomas/.julia/v0.3/PyPlot/src/PyPlot.jl:370
 in anonymous at no file:13


Does anyone have any idea what's happening, and in particular why there'd be a 
difference between the REPL and IJulia? 


Thanks