How to bin x y graph

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Parag 2015-9-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/239241-how-to-bin-x-y-graph

评论： Image Analyst 2015-10-21

Hi guys

I have a x, y graph,as shown in picture. I want to combined it to one single curve. Can you please let me know how to do that. I tried using binning but my x and y values are dependent means when I plot only y data it looks different. I will appreciate your help. Thank you

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dpb 2015-9-2

Which toolbox(es) do you have available or base Matlab only? What is the intended end use of the smoothed/single curve?

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Answer 1

Image Analyst 2015-10-19

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https://ww2.mathworks.cn/matlabcentral/answers/239241-how-to-bin-x-y-graph#answer_196581

savitzky_golay_filter_1D_Sine.m

Combine all the arrays into single x and y arrays, then you can sort the data based on the x values, then use sgolayfilt() in the Signal Processing Toolbox. I've attached an example.

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Parag 2015-10-21

I need help with the question posted on below link. I will appreciate if could let me know methode to do planer fit that will be a grate help. At this point I don't have any idea about 2D planer fit. Question is here in this link http://www.mathworks.com/matlabcentral/answers/249190-help-with-2d-planer-fit

Image Analyst 2015-10-21

BGCorrect_demo.m

It's not the way I would have done it, though it may work. Using the histogram basically gives you quantized data, which is coarser than your original sampling. You use 5000 bins to try to have it be less quantized but with that many bins, you may have many bins with just one value in them, unless you have hundreds or millions of values. So the final mean curve may look kind of noisy. With sgolayfilt() you don't have those problems. First I'd pass the data into interp1() to get uniformly sampled data, then I'd call sgolayfilt() - it's like 2 lines of code.

For fitting a plane, I'd recommend polyfitn() by John D'Errico http://www.mathworks.com/matlabcentral/fileexchange/34765-polyfitn Attached is an example.

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