# how to detemine this residual matrix ?

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Nadya am 10 Aug. 2020
Kommentiert: Peng Li am 12 Aug. 2020
I calculate the cumulative sum of a matrix :Gm,n(i,j)
Now, the next step is '' we adopt the simplest function of a plane-fitting (i.e.Gm,n(i,j)=ai+bj+c ) to fit the trending for each surface Gm,n and determine the residual matrix ym,n(i,j).''
Please, can someone give me the code how to detemine this residual matrix, please ?
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Peng Li am 10 Aug. 2020
You question isn't clear enough for people to provide valuable comments honestly.
Nadya am 10 Aug. 2020
It is explained like this in the paper.
To estimate the eq 2, I need to determine ''the residual matrix''.
Sincerely, I myself didn't understand, especially the fact that I'm not a mathematician, but I need to program this method.

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### Antworten (1)

Peng Li am 10 Aug. 2020
Interesting. This is an application of the detrended fluctuation analysis (DFA) to a 2D image. Based on what your screenshot shows, it implements the algorithm similarly like being implemented to a time series -- cut into segments based on a time scale s (or here a time-spatial scale), integration (cumulative sum), linear fitting to get residual, and finally there should be a log-log fit between s and F(s).
To answer the specific question you asked, the residual is nothing but the point difference between G_{m,n} and \tilde{G}_{m,n}. This means, the y variable y_{m,n} = G_{m,n} - \tide{G}_{m,n}. F is simply the average of sum of squared y.
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Nadya am 11 Aug. 2020
Sincerely, I have no idea, I have never programmed the equations in Matlab.
Thank you anyway.
Peng Li am 12 Aug. 2020
understand and I would just like to encourage you to try it out and ask back here if you get any issues. That way you probably have higher chance to get a solution. I will see what I can do but honestly I have short of time this week and next to meet multiple deadlines, conferences ...

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