find an equation for the set of coordinates

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Duncan on 12 Aug 2014
Commented: Image Analyst on 17 Aug 2014
I have the above plot with a different set of coordinates for each object(labeled by different colors). I was wondering if there was a way to find an approximate equation for each object in matlab.
I was thinking about smoothing out the "rougher" parts to make it easier but I'm not sure how to go about doing that. any ideas?

Answers (2)

Image Analyst
Image Analyst on 12 Aug 2014
How about just taking the average of the coordinates
windowWidth = 5;
newx = conv(x, ones(1, windowWidth)/windowWidth, 'same');
newy = conv(y, ones(1, windowWidth)/windowWidth, 'same');
Image Analyst
Image Analyst on 17 Aug 2014
Sorry - I usually use conv2(), which is for 2D arrays (images). For a 1-D signal, you'd use conv().

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Ahmet Cecen
Ahmet Cecen on 12 Aug 2014
I would use cftool, easier to play around with different fits, and not confined to polynomials.

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