HermitePoly.m
6747c30adba5shear_version

HermitePoly.m
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			% HermitePoly.m by David Terr, Raytheon, 5-10-04

			% Given nonnegative integer n, compute the
			% Hermite polynomial H_n. Return the result as a vector whose mth
			% element is the coefficient of x^(n+1-m).
			% polyval(HermitePoly(n),x) evaluates H_n(x).


			function hk = HermitePoly(n)
			% Evaluate the normalized Hermite polynomial.
			if n==0
			hk = 1;
			elseif n==1
			hk = [2 0];
			else

			hkm2 = zeros(1,n+1);
			hkm2(n+1) = 1;
			hkm1 = zeros(1,n+1);
			hkm1(n) = 2;

			for k=2:n

			hk = zeros(1,n+1);

			for e=n-k+1:2:n
			hk(e) = 2(hkm1(e+1) - (k-1)hkm2(e));
			end

			hk(n+1) = -2(k-1)hkm2(n+1);

			if k<n
			hkm2 = hkm1;
			hkm1 = hk;
			end

			end

			end