find an equation for the set of coordinates
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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
回答（2 个）
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');
4 个评论
Duncan
2014-8-12
Image Analyst
2014-8-12
编辑：Image Analyst
2014-8-12
Huh? Why? conv2() is already like doing a polyfit of order 1 (a line). If you want higher order for less smoothing, use a Savitzky-Golay filter, sgolayfilt() in the Signal Processing Toolbox.
Perhaps increasing sampling and getting a smoother curve via splines would interest you. See attached demo.
Duncan
2014-8-17
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().
Ahmet Cecen
2014-8-12
0 个投票
I would use cftool, easier to play around with different fits, and not confined to polynomials.
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2014-8-17
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