POLYVAL  POLYVAL Evaluate Polynomial Fit at Selected Points


Usage
 
 The polyval routine has the following syntax
 
   y = polyval(p,x)
 
 where p is a vector of polynomial coefficients,
 in decreasing degree (as generated by polyfit, for example).
 If x is a matrix, the polynomial is evaluated in the matrix
 sense (in which case x must be square).
 