Smoothing a curve and conserving the first and the last value of the curve

Hi all,

I am trying to smooth a simple curve with evenly spaced sample points which starts e.g. at 1 for t0 and ends at 0 for t1. Can I force the smoothing algorythm (e.g. smoothdata()) to conserve the first and the last value of the curve such dat the smoothed curve also starts at 1 at t0 and ends at 0 at t1?

Thanks a lot!

Answer 1

[Star Strider]

Probably the only way to do that is to use the 'SamplePoints' name-value pair, and smooth all but the beginning and end points —

x = 1:25;
y = randn(size(x));

ys = smoothdata(y(2:end-1), 'SamplePoints',x(2:end-1));

figure
scatter(x, y, 'p')
hold on
plot(x, [y(1) ys y(end)], '-r')
hold off
grid

.

[Hannes Frey]

Thank you!

[Star Strider]

As always, my pleasure!

.