Parabolas

"repParabola" generates a train of truncated parabolas

% repParabola generates a train of parabolas (truncated)
% ------------------------------------------------------
% x: 1D x vector, e.g x = linspace(-5,10,1000)
% interfaces: points among whom a parabola will be plotted
% Amp: Amplitude of the train of parabolas
% ------------------------------------------------------
% Examples:
% x=linspace(-5,5,1000);
% yp = repParabola(x,[-4 -3 -2 -1 0 1 2 3],100);
% plot(x,yp,'b','LineWidth',2.5), grid
%
% x=linspace(0,5,1000);
% yp = repParabola(x,[1 3 3 4 4 5],8);
% plot(x,yp,'b','LineWidth',2.5), grid
%
% x=linspace(0,10,1000);
% yp = repParabola(x,[3 5 5 7],10);
% plot(x,yp,'b','LineWidth',2.5), grid
%
% University of Essex, UK.
% Ernesto Momox B.
% March 2010