Holcombe:Programming: Difference between revisions

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To understand Dani's programs, there are two steps.  First, you must learn Spanish.


Mostly the lab uses [http://www.visionegg.org VisionEgg] (also see [http://www.freelists.org/archives/visionegg/ mailing list] and [http://www.psychopy.org PsychoPy] python libraries to help draw stuff.  
==Psychopy==
Mostly the lab uses [http://www.psychopy.org PsychoPy]. Some are still using VisionEgg. Both are libraries to help python code draw stuff.


Our [[Holcombe:Psychopy| psychopy notes]].
Some [http://sapir.psych.wisc.edu/wiki/index.php/Psych711 nice easy programming exercises] for Psychopy available from Gary Lupyan, developed for his postgrad psych class.
Get your Psychopy programming questions answered at the [http://groups.google.com/group/psychopy-users mailing list].


==Installing Visionegg and Psychopy==
If you're moving to Psychopy/Python from Matlab, SciPy has a good introduction to [http://www.scipy.org/NumPy_for_Matlab_Users/ Python for Matlab Users], with a big list of equivalent expressions in the two languages.
*WINDOWS: Psychopy installation. It is easier to intall Enthought Python Distribution that contains all the necessary dependencies than to install at hand one by one the dependencies. Using Enthought, however, I found incompatibilities with Visionegg. Installing the dependencies at hand I did not have problems to run both programs in the same computer.


Our [[Holcombe:Psychopy| psychopy and visionegg installation notes]] .


==Python programming==
To understand Dani's programs, there are two steps.  First, you must learn Spanish.
Here is a file [[Media:Matlab-python-xref.pdf‎]] that gives equivalent code for doing array operations in MATLAB, Python, and R
 
Good syntax guide [http://codesyntax.netfirms.com/lang-python.htm here] , Explanation of how default assignment creates reference rather than new variable [http://www.gossamer-threads.com/lists/python/python/617333 here] says to use deepcopy()
 
For data analysis, [http://mdp-toolkit.sourceforge.net/docs/api/mdp-module.html mdp] provides some useful functions like mdp.utils.uniq()


Here [[Media:AudioAndUSBnotesWithPython.oo3]] is the file with all my notes on different ways to play a sound in Python and the  associated latencies and standard deviations of the latencies--[[User:Alex O. Holcombe|Alex O. Holcombe]] 05:15, 25 June 2008 (UTC)
==Python programming (outside of the Psychopy editor, as is required for VisionEgg)==


Running python interactively from the Terminal alone is frustrating because you can't use arrow keys for history, no auto-complete, etc. You will probably want to use some [[Holcombe:PythonIDEs| IDE]].
Running python interactively from the Terminal alone is frustrating because you can't use arrow keys for history, no auto-complete, etc. You will probably want to use some [[Holcombe:PythonIDEs| IDE]].


===Tricks===
never have your data file overwritten again!  include the following lines in your python code:
never have your data file overwritten again!  include the following lines in your python code:
<code>
<code>
Line 31: Line 26:
  #### e.g. 'aBindingExpData_04_Aug_2008_22:46'
  #### e.g. 'aBindingExpData_04_Aug_2008_22:46'
</code>
</code>
Also don't lose track of what program generated the data, take advantage of sys.argv which gives the invoking program name and include code something like:
<code>
import sys
print >>logF, 'running script "',sys.argv[0],'"'


 
[http://pages.physics.cornell.edu/~myers/teaching/ComputationalMethods/python/arrays.html scipy array tip sheet]
==Data analysis==
==Data analysis==
Can be done in Python use SciPy which includes matplotlib ([http://matplotlib.sourcearchive.com/documentation/0.98.1/classmatplotlib_1_1text_1_1Text.html ref])
See the [http://matplotlib.sourceforge.net/faq/howto_faq.html HowTo] and Cookbook
or
[[Holcombe:ProgrammingInR| programming in R (data analysis)]]
[[Holcombe:ProgrammingInR| programming in R (data analysis)]]
[[Holcombe:PythonDataAnalysis| Python programming for data analysis]]

Revision as of 17:20, 4 July 2012

Recent members

• Alex Holcombe
• Ryo Nakayama


Technical

• Skills Checklist
• Python Programming
• Psychopy/VisionEgg Installation Notes
• R analysis,plot,stats
• Statistics
• Buttonbox
• Buttonbox with photocell
• Programming Cheat Sheets



Psychopy

Mostly the lab uses PsychoPy. Some are still using VisionEgg. Both are libraries to help python code draw stuff.

Some nice easy programming exercises for Psychopy available from Gary Lupyan, developed for his postgrad psych class. Get your Psychopy programming questions answered at the mailing list.

If you're moving to Psychopy/Python from Matlab, SciPy has a good introduction to Python for Matlab Users, with a big list of equivalent expressions in the two languages.

Our psychopy and visionegg installation notes .

To understand Dani's programs, there are two steps. First, you must learn Spanish.

Python programming (outside of the Psychopy editor, as is required for VisionEgg)

Running python interactively from the Terminal alone is frustrating because you can't use arrow keys for history, no auto-complete, etc. You will probably want to use some IDE.

never have your data file overwritten again! include the following lines in your python code: 

from time import localtime,strftime
timeAndDateStr = strftime("%d_%b_%Y_%H:%M", localtime())
filename = 'aBindingExpData_'    #include here whatever you want
filename = filename + timeAndDateStr  #filename will now have date time and year tacked on the end,
outputFileStream = open(filename, 'a')
#### e.g. 'aBindingExpData_04_Aug_2008_22:46'

Also don't lose track of what program generated the data, take advantage of sys.argv which gives the invoking program name and include code something like: import sys print >>logF, 'running script "',sys.argv[0],'"'

scipy array tip sheet

Data analysis

programming in R (data analysis) Python programming for data analysis

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