It depends on what you intend by ’smooth’.
Try this:
I = openfig('scma25.fig');
Ax = gca;
Lines = findobj(Ax,'Type','line');
for k = 1:numel(Lines)
X(k,:) = Lines(k).XData;
Y(k,:) = Lines(k).YData;
pv(:,k) = polyfit(X(k,:), Y(k,:), 3);
yf(k,:) = polyval(pv(:,k),X(k,:));
end
figure
semilogy(X', yf')
grid
legend(Ax.Legend.String)
xlabel(Ax.XLabel.String)
ylabel(Ax.YLabel.String)
It uses polyfit and polyval to fit your data, then plots the fitted data in a new figure. It also re-uses your axis labels and legend strings.
