To clear up a question regarding my earlier posting regarding random changes in 
a vector:

Say you have a vector (1, -1, -1, 1, 1, -1).  I want each value in the vector 
to have a probability that it will change signs when this vector is 
regenerated.  For example, probability = 50%.  When the vector is regenerated, 
the first value in the vector (1) has a 50% chance of switching to -1.  If I 
regenerated this vector 10 times, 5 of the times it would switch to -1.  
Similarly, I need each value in the vector to have this same probability of 
switching signs when the vector is regenerated, and each value's chances of 
doing so is independent of the other values.  So the second value (-1) also has 
a 50% chance of switching to 1, and whether or not it does so is independent of 
if the first value changes from 1 to -1 (also a 50% probability). 

 I hope this clears up the confusion, and I would appreciate any help anyone 
can provide!
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