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change in histogram distributions

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Hi, is it possible to flip a histogram around the peak value? I do not want to flip the axis. Just for performing some checks, I want to invert my distribution from negative skewness to positive skewness, keeping the mean value at its original value. any help is appreciated.

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Théophane Dimier
Théophane Dimier on 9 Dec 2020
Edited: Théophane Dimier on 9 Dec 2020
Hi!
It should be doing the following (considering that a is your input)
[counts,center]=hist(a);
bar(center,counts);
hold on
center_mirror=flip(center);
bar(center_mirror,counts);
This should plot the histogram and the mirrored histogram.
If you want to force it to rotate around the peak (conservation of the mode of the distribution):
[counts,center]=hist(a);
bar(center,counts);
hold on
[~,idx]=max(counts);
center_mirror=2*center(idx)-center;
bar(center_mirror,counts);
I hope it answers your question!

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Sumera Yamin
Sumera Yamin on 11 Dec 2020
Yes of course. could you please explain what is "idx" and what is code doing? i want to integrate it in my original code and i cannot understand it, what if i want to use histogram instead of bar
Image Analyst
Image Analyst on 11 Dec 2020
The cryptic idx should have been called something more explicit and descriptive, like "indexOfMax". Basically it's the first index (bin number) where the max value (mode) of the histogram appears. Does that explain it better.
Sumera Yamin
Sumera Yamin on 11 Dec 2020
ok, thanks, i understood it now.

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