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MathGroup Archive 1992

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The case of the disappearing windows.

  • To: mathgroup at yoda.physics.unc.edu
  • Subject: The case of the disappearing windows.
  • From: mcwilljg at euler.sfasu.edu
  • Date: Mon, 5 Oct 92 13:58:33 CDT

I have written a number of Mma procedural programs for use in a  
numerical analysis class that I teach.  These programs are files  
containing Mma commands and are executed using the <<filename  
command.  The students must enter a function (which is then parsed),  
and constant values specific to the particular procedure.  They are  
given an option to plot the entered function.  Since they are usually  
running the kernel remotely, they can choose the type of output  
device that they need(terminal, tektronics or Mma window).  


My problem is this:  In any single session, if the programs are run  
in a Mma window, after a number of executions(not always the same  
number), Mma dies immediately after one of the input windows(not  
always the same one) disappears after accepting input.  This is not a  
logic problem, the programs run on any legitimate example, nor is it  
a case of bad input values, the same example will run 4 or 5 times  
and MMa will die on the 6th time.  Furthermore, if the programs are  
run remotely, no problems are experienced at all.

My suspicion is that perhaps some variables or functions must be  
cleared after each run or some sort of initialization or resetting  
must be done after each run in order to avoid a buffer overflow when  
executing in a window.  


NOTE: SWAPFILE does _not_ increase is size after a MMa window dies in  
this manner.

Any suggestions??





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