function [X,Y] = quadplot(e0,e1,e2)
% help text goes here...

% deal with missing inputs
if nargin<3
  e2=0;
end
if nargin<2
  e1=0;
end

if nargin<1
  % if no inputs, display usage message – otherwise plot curve
  disp('usage: [X,Y] = polyplot(e0,e1,e2)')
else
  X = [-100:0.1:100];
  Y = e0 + e1*X + e2*X.^2;
  figure;
  plot(X,Y,'linewidth',3)
end