How to do data selection from a graph to extract the evenly spaced data points ?

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Chin Kui Ku 2018-8-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/413002-how-to-do-data-selection-from-a-graph-to-extract-the-evenly-spaced-data-points

评论： KSSV 2018-8-1

Dear peers, i would like to select or extract the data that the Y axis is more than 0.001. and then select 60 points that are evenly spaced out in the selected graph area.

for eg: The original graph is generated by matlab simulink. and would like to select the data that are in the Red rectangle.

the outcome is expected as follow: 30 data points that evenly space (closet) that are selected from each peaks.

What is the best search method to find the evenly space data points? and i would use this algorithm for different graphs.

Thank you very much

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Answer 1

KSSV 2018-8-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/413002-how-to-do-data-selection-from-a-graph-to-extract-the-evenly-spaced-data-points#answer_331146

在 MATLAB Online 中打开

Let X and Y be your data arrays.

N = 30 ;
xi = linspace(min(X),max(X),N) ;
yi = interp1(X,Y,xi) ;
plot(xi,yi)
axis([-100 100 0 0.04])

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Chin Kui Ku 2018-8-1

thanks, I supposed that need to extract the X & Y data arrays for those points of Y>0.001. for left quadrant, and right quadrants.

and the xi & yi mentioned above are regenerated by matlab correct? however, i am interested in selecting the existing closest x & y evenly spaced points. any idea on how to do so?