Re: [Matplotlib-users] Fast imshow plotting

[Eric F. <ef...@ha...>]

Thomas Robitaille wrote:
> Not sure if this will help, but maybe you can do something like this?
> 
> ---
> #!/usr/bin/env python
> 
> from pylab import *
> from scipy import *

To run this as a standalone script, without ipython -pylab, you need to 
include:

ion()

> 
> img = standard_normal((40,40))
> image = imshow(img,interpolation='nearest',animated=True,label="blah")
> 
> for k in range(1,10000):
>      img = standard_normal((40,40))
>      image.set_data(img)
>      show()

show() should never be called more than once for a given figure; what 
you want here is draw().

Eric


> ---
> 
> Note, interpolation='nearest' can be faster than interpolation=None if  
> your default interpolation is set to bicubic (which it probably is)
> 
> Does this speed things up?
> 
> Thomas
> 
> On May 1, 2009, at 3:31 PM, Joey Wilson wrote:
> 
>> I am creating a script that generates images and displays them to  
>> the screen in real time.  I created the following simple script:
>>
>> __________________________
>>
>> #!/usr/bin/env python
>>
>> from pylab import *
>> from scipy import *
>>
>> for k in range(1,10000):
>>     img = standard_normal((40,40))
>>     imshow(img,interpolation=None,animated=True,label="blah")
>>     clf()
>>     show()
>>
>> __________________________
>>
>> Now,  this script plots the image too slowly.  I am forced to use  
>> the clf() function so that it doesn't slow down at each iteration of  
>> the for loop.  Is there a way that I can plot this simple image  
>> faster?  What's the best way to get imshow() to plot quickly?   
>> Thanks for your help.
>>
>> -Joey
>>
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> 
> 
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