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].


==Python programming==
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.
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()
Our [[Holcombe:Psychopy| psychopy and visionegg installation notes]] .


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)
Link to Alex's GitGub page https://github.com/alexholcombe


Dr. Python is good because it checks indentation. Instead of using {} to delimit code blocks, it uses indentation like so:
Link to Charlie's GitHub page https://github.com/cludowici
if X
  asdf
  asdf


dddd
==Python programming (outside of the Psychopy editor, as is required for VisionEgg)==
---Each line needs to be offset by the same number of spaces/tabs. Dr. Python checks to make sure this is true so you're not tripped up by invisible characters like tabs masquerading as spaces


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]].
never have your data file overwritten again!  include the following lines in your python code:
<code>
<code>
if X
  asdf
  asdf
</code>
===Tricks===
never have your data file overwritten again!  include the following lines in your python code:
<source lang="python">
  from time import localtime,strftime
  from time import localtime,strftime
  timeAndDateStr = strftime("%d_%b_%Y_%H:%M", localtime())
  timeAndDateStr = strftime("%d_%b_%Y_%H:%M", localtime())
Line 35: Line 27:
  outputFileStream = open(filename, 'a')
  outputFileStream = open(filename, 'a')
  #### e.g. 'aBindingExpData_04_Aug_2008_22:46'
  #### e.g. 'aBindingExpData_04_Aug_2008_22:46'
</source>
</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==
[[Holcombe:ProgrammingInR| programming in R (data analysis)]]
[[Holcombe:ProgrammingInR| programming in R (data analysis)]]
[[Holcombe:PythonDataAnalysis| Python programming for data analysis]]

Latest revision as of 18:23, 6 June 2017

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 .

Link to Alex's GitGub page https://github.com/alexholcombe

Link to Charlie's GitHub page https://github.com/cludowici

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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