find an equation for the set of coordinates

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Duncan
Duncan 2014-8-12
评论： Image Analyst 2014-8-17
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?
thanks

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回答（2 个）

Image Analyst
Image Analyst 2014-8-12
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');
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Duncan
Duncan 2014-8-17
hi sorry, i noticed you put conv() in the e.g. and then said that conv2() is a polyfit of order 1.
Image Analyst
Image Analyst 2014-8-17
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 2014-8-12
I would use cftool, easier to play around with different fits, and not confined to polynomials.

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