I am using matplotlib to draw charts and graphs.
When I plot the chart using the command
show() my code blocks at this command.
I would like to refresh my list of values with new data , and than refresh the image on the background. How to do that without closing each time the window with the graph? Below is the code I am using
import pylab a = (1,2,3,4) pylab.plot(a) pylab.show() # blocks here
In IPython started with
-pylab it should not block.
ion() you turn the interactive mode on.
show() does not block your system
plot(x, y) updated your plot.
ioff() turns interactive mode off. Useful if you add lots of data and don't
want to update every little detail.
If you are not using the IPython shell but instead running a program, you probably want to do:
plot(), possibly followed by
raw_input("Press enter when done...")
so as to wait for the user before plotting something else.
If you do
pyplot.ion() at the beginning of your program, doing
draw() can often even be skipped.
pyplot.show() is actually an infinite loop that handles events in the main plotting window (such as zooming, panning, etc.).