How do I find the value for which x% of the array is covered?

Question

Lieke Pullen 2022-1-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1631935-how-do-i-find-the-value-for-which-x-of-the-array-is-covered

编辑： Prahlad Gowtham Katte 2022-1-25

采纳的回答： Prahlad Gowtham Katte

D_tumorVSV.mat

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Hi all,

I have a 3D array (attached), where I calculated the dose per voxel. Now, I want to find the minimum dose for which 20% of the array is covered (exluding zeros). I've tried the following:

D20_VSV=sort(D_tumorVSV(:),'descend');
result=D20_VSV(1:ceil(length(D20_VSV)*0.9));

This is a simple code (via this question), but doesn't seem to give the wanted result. How should I do this? Thank you in advance!

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Answer 1

Prahlad Gowtham Katte 2022-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/1631935-how-do-i-find-the-value-for-which-x-of-the-array-is-covered#answer_881265

编辑：Prahlad Gowtham Katte 2022-1-25

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Hi

My understanding of the question is that you want to sort a 3-dimensional array and you want to extract the minimum for which 20% of the array is covered excluding zeroes.

The following code snippet can help with the issue

x = C_holllowtumor;                           %A random 3-dimensional array 
y = sort(x(:),'ascend');                      % Sorting the array in ascending order 
y = nonzero(y);                               % Extracting the non-zero elements 
Result = y(1:ceil(length(y)*0.2));            % Getting the 20% elements 
%Result(end)   --this would give a single element from the Result.