Thank you for your response.
Benjamin Root-2 wrote:
>
> On Sunday, May 29, 2011, Eric O LEBIGOT (EOL)
> <eric.lebi...@normalesup.org> wrote:
>>
>> What does ion() exactly do?
>>$$$
>> from matplotlib import pyplot as pp
>>
>> pp.plot([10, 20, 50])
>> pp.draw()
>>
>> raw_input('Press enter...') # No graph displayed?!!
>>$$$
>
> Turning interactive mode on also means an implied "show" command, if
> needed. The first program can replace draw() with show(). However,
> if interactive mode is off, then the python execution pauses. With it
> on, python execution will continue.
>
So, if anything is drawn when interactive mode is off, does one *have* to
use show() at the end? in other words does using a single raw_input() at
the end of the program force the use of the interactive mode for *all*
figures? (Closing all the figures with a simple "enter" is very convenient,
but having a performance penalty for this would not be so nice…).
Now, if I understand you correctly, I have another question. I don't
understand anymore what draw() does: in fact, it is not necessary in
interactive mode, and it does not appear to do anything in non-interactive
mode, since show() is really the function that really displays the figures.
So, why does matplotlib offer draw()? what does it really do?
EOL
PS: Here is an example: the following code does *not* display the first
figure (Matplotlib 1.0.0 on Mac OS X with the GTKAgg backend):
$$$
from matplotlib import pyplot as pp
pp.figure()
pp.plot([10, 20, 50])
pp.draw() # Will not be displayed despite the draw()
pp.ion() # Interactive mode on
pp.figure()
pp.plot([100, 20, 10])
raw_input('Press enter...') # Only the second graph is displayed
$$$
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