smooth smoothing by spline functions [pt]=smooth(ptd [,step]) ptd (2xn) real vector step real (discretization step of abscissae) pt (2xn) real vector this function computes interpolation by spline functions for a given set of points in the plane. The coordinates are (ptd(1,i),ptd(2,i)). The components ptd(1,:) must be in ascending order. The default value for the step is abs(max(ptd(1,:))-min(ptd(1,:)))/100 x=[1 10 20 30 40]; y=[1 30 -10 20 40]; plot2d(x',y',[3],"011"," ",[-10,-40,50,50]); yi=smooth([x;y],0.1); plot2d(yi(1,:)',yi(2,:)',[1],"000"); splin interp interpln