% https://www.mathworks.com/help/matlab/ref/double.interp1.html

% we can export the points generated by this code
% to a .mat file and call it from simulink to plug into
% a PID controller

% setup vars
t = [0, 1, 2, 3, 4];
p = [0, -18, -45, -18, 0];

% generate graph lines
querypts = 0:1/16:4;
interpts = interp1(t, p, querypts, 'spline');

% create graph
figure
plot(t, p,'o', querypts, interpts, ':.');