LeastSq:

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   Find a weighted least squares curve fit to the overdetermined
   set of equations

   y = ax 

   where

   a = [x.^e(1), x.^e(2)...] and x are column vectors

   where y and x are inputs and y = f(x).

   Since version 1.
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   Form:
   [c, err] = LeastSq( e, y, x, w )
   [c, err] = LeastSq( e, y, x )
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   ------
   Inputs
   ------
   e                  Array of exponents
   y                  Left hand side
   x                  Right hand side
   w                  Weights

   -------
   Outputs
   -------
   c                  Coefficients

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