piecewisecubic_test - ydd2 = ppval(ppsdd,x subplot(3,1,1...

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% Play with piecewise cubic interpolation. % Generate some data points to interpolate. xdp = 1:10; ydp = randi(10,1,10); x=linspace(1,10,1001); % Generate Function that works on any set of x values in [1,10]; pp = interp1(xdp,ydp,'pchip','pp'); y1 = ppval(pp,x); pps = interp1(xdp,ydp,'spline','pp'); y2 = ppval(pps,x); %% First Derivatives ppd=ppder(pp); yd1 = ppval(ppd,x); ppsd=ppder(pps); yd2 = ppval(ppsd,x); %% Second Derivative ppdd=ppder(ppd); ydd1 = ppval(ppdd,x); ppsdd=ppder(ppsd);
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Unformatted text preview: ydd2 = ppval(ppsdd,x); subplot(3,1,1) plot(x,y1,x,y2,xdp,ydp,'r*'); legend('pchip','spline','data pts') title(' pp(x) ','FontSize',20) set(gca,'FontSize',20); axis tight subplot(3,1,2) plot(x,yd1,x,yd2); legend('pchip','spline') title(' pp''(x) ','FontSize',20) set(gca,'FontSize',20); axis tight subplot(3,1,3) plot(x,ydd1,x,ydd2); legend('pchip','spline') title(' pp''''(x) ','FontSize',20) set(gca,'FontSize',20); axis tight...
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