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curvefittingig.m

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+clear, clc
+xf = [0:0.05:10];
+yf = sin (2*pi*xf/5);
+xp = [0:10];
+yp = sin (2*pi*xp/5);
+lin = interp1 (xp, yp, xf);
+near = interp1 (xp, yp, xf, "nearest");
+pch = interp1 (xp, yp, xf, "pchip");
+spl = interp1 (xp, yp, xf, "spline");
+plot (xf,yf,"r", xf,near,"g", xf,lin,"b", xf,pch,"c", xf,spl,"m",
+      xp,yp,"r*");
+legend ("original", "nearest", "linear", "pchip", "spline");