Y = evalfit(F,X) evaluates the fit F for the values X. F is a fit
structure, as obtained by ezfit, showfit or SELECTFIT. Y is a vector
of the same length as X, with Y(i) = F(X(i)).
Example
plotsample('power');
f = ezfit('power; log');
x = logspace(1,3,1000);
hold on; plot(x,evalfit(f,x),'r-'); hold off;