Program:	LAGRANGE
Author:	Dave Gaebler
February 17, 1999

Variables used:A,B,C,D,E,F,G,N,X,Y1,L1,L2,L3,L4,L5,L6,LP
Given n points with different x-coordinates, the Lagrange Interpolation Formula 
finds a polynomial of degree n-1 or less that passes through all the points.  
However, this polynomial is the sum of several polynomials, each of which is 
factored, e.g. (x-1)(x-3)(x+2)/(4-1)(4-3)(4+2).  Finding the actual coefficients 
is rather complicated.  This program finds the coefficients, displaying them in 
fractional form if possible, for reasonably small numbers of points (less than 
15 or so.)  It's painfully slow, though, for more than 4 or 5.  If you have a 
few points fairly close to the origin, use my other Lagrange program!

You will be asked whether to "redimension" or not.  If you choose yes, the graphing
window will be adjusted to fit the points you entered.  If you choose no, the 
polynomial will be graphed in the current window.