How to count the maximum and minimum range of non-zeros elements?

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Jahanzeb Saqib 2020-12-7

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https://ww2.mathworks.cn/matlabcentral/answers/685263-how-to-count-the-maximum-and-minimum-range-of-non-zeros-elements

评论： Jahanzeb Saqib 2020-12-8

采纳的回答： Image Analyst

let's suppose we have A of length 50 rows

how we can calculate the maximum range of non-zeros element and as well as minimum

A = [0 0 1 1 1 1 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 ]

In this case Max and Min should be,

Max = 5

Min = 2

Is there a straightforward solution to do this? without using complex looping because in my case data is too large approximately length of A is 220079705, your kind consideration will be highly regarded by all means,

Many Thanks

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hangar011 2020-12-7

There are built-in functions for this...

length(find(A)) or length(find(A==0))

Image Analyst 2020-12-7

Sorry, but length(find()) won't work. See my answer below.

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Answer 1

Image Analyst 2020-12-7

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https://ww2.mathworks.cn/matlabcentral/answers/685263-how-to-count-the-maximum-and-minimum-range-of-non-zeros-elements#answer_568493

在 MATLAB Online 中打开

Use regionprops(), in the Image Processing Toolbox:

A = [0 0 1 1 1 1 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 ]
props = regionprops(logical(A), 'Area');
allLengths = [props.Area];
minLength = min(allLengths)
maxLength = max(allLengths)