change in histogram distributions

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Sumera Yamin
Sumera Yamin 2020-12-9
编辑： Sumera Yamin 2020-12-11
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 2020-12-9
编辑：Théophane Dimier 2020-12-9
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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Image Analyst
Image Analyst 2020-12-11
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 2020-12-11
编辑：Sumera Yamin 2020-12-11
ok, thanks, i understood it now.

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