How to find the quartiles of an array?

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RB
RB 2018-2-27
回答： Rajanya 2024-12-23
I currently have a 1024x1024 array. I want to find the first and fourth quartile range for this array. (I already used iqr(a(:)) to find the interquartile range, however now I want to find the first and fourth). Thank you!

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Rajanya
Rajanya 2024-12-23
Ran in:
Hi @RB,
You can use 'prctile' on the flattened array to calculate the 25th percentile which in turn will give you the first quartile.
a = rand(1024,1024);
a_flattened = a(:);
out = prctile(a_flattened,25)
out = 0.2505
You can refer to the documentation page of 'prctile' for more information on the same by executing the following command from MATLAB command window.
doc prctile
Thanks!

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