Problem in calculating 30th percentile

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Zhou Ci
Zhou Ci on 21 Nov 2021
Commented: Zhou Ci on 22 Nov 2021
Hello everyone,
I am trying to calculate the 30th percentile. I tried using prctile function but didn't get the result. I've calculated 50th percentile (median) as below:
Temp = 437x1 double:
Area = 437x1 double;
[G,grpTemp] = findgroups(round(Temp));
medianAr = splitapply(@median,Area,G);
Any suggestions how to calculate 30th percentile?

Accepted Answer

Rik on 21 Nov 2021
Write a function that calculates the 30th percentile for a vector. Then provide the handle to that function to splitapply.
The easiest way to calculate the 30th percentile is probably to sort your vector and index it. Note that you may need to average 2 values if the index is not an integer.

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