smf compute the s-shaped member function of x
with parameters [a,b].
Examples
x=linspace(0,1,100)';y1=smf(x,[0.20.3]);y2=smf(x,[0.20.6]);y3=smf(x,[0.20.8]);y4=smf(x,[0.80.4]);scf();clf();plot2d(x,[y1y2y3y4],leg="y1@y2@y3");xtitle("S-Shaped Member Function Example","x","mu(x)");