compute_fa.m
9c460ecf6b6egather_output

compute_fa.m
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			function FF = compute_fa(Napj, spar, xperp)
			%% Compute the dispersion function from the moment hierarchi decomp.
			% Normalized Hermite
			Hp = @(p,s) polyval(HermitePoly(p),s)./sqrt(2.^p.*factorial(p));
			% Laguerre
			Lj = @(j,x) polyval(LaguerrePoly(j),x);
			% Maxwellian factor
			FaM = @(s,x) exp(-s.^2-x);

			[SS, XX] = meshgrid(spar, xperp); %meshgrid for efficient evaluation

			FF = 0 .* SS;

			[Pmax,Jmax] = size(Napj);

			FAM = FaM(SS,XX);
			for p_ = 0:Pmax-1
			HH = Hp(p_,SS);
			for j_ = 0:Jmax-1
			LL = Lj(j_,XX);
			FF = FF + Napj(p_+1,j_+1)HH.LL.*FAM;
			end
			end