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%% Data Interpolation Using |spline| and |pchip| % Copyright 2015 The MathWorks, Inc. %% x = -3:3; y = [-1 -1 -1 0 1 1 1]; t = -3:.01:3; p = pchip(x,y,t); s = spline(x,y,t); plot(x,y,'o',t,p,'-',t,s,'-.') legend('data','pchip','spline','Location','SouthEast')