It appears that
pplane8 programs are not compatible with MATLAB version r2015a, installed on ITaP computers. Instead, you can do the following.
Use the java versions of these programs that can be found here: http://math.rice.edu/~dfield/dfpp.html. Note: This requires the Java Runtime Environment 1.6 or newer.
[Works again] Use MATLAB r2014a that can still be found in ITaP Software Remote:
Go to the folder Standard Software / Computational Packages / MATLAB, where you can find MATLAB version r2014a. (Note: There are two copies of MATLAB r2015a, one in the top level directory, and one in Standard Software / Computational Packages /. Dont’t use those.)
Update Aug 29, 2015: The version r2014a was removed last week, but was kindly restored by ITaP, following the request from Math Department.