Find the minimum and maximum value of internal intervals in an array

Question

Andrew Sol 2023-1-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1898110-find-the-minimum-and-maximum-value-of-internal-intervals-in-an-array

回答： KSSV 2023-1-21

array.mat

There is the following array:

It has several subintervals:

I'm trying to write code that extracts these sub-intervals and, most importantly, looks for the minimum and maximum value in these sub-intervals.

That is, the end result should look something like this:

I continue to work, but so far without success.

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Andrew Sol 2023-1-21

编辑：Andrew Sol 2023-1-21

在 MATLAB Online 中打开

https://www.mathworks.com/matlabcentral/answers/335333-split-array-into-separate-arrays-at-row-with-nans

https://www.mathworks.com/matlabcentral/answers/284645-maximum-and-minimum-of-each-columns-of-a-cell-array

With the help of these two themes, I got the following code. Which seems to be working. Can it be simplified somehow?

array = array';
idx = all(isnan(array),2);
idr = diff(find([1;diff(idx);1]));
D = mat2cell(array,idr(:),size(array,2));
D{1:2:end}
Dmax=cellfun(@max,D);
Dmin=cellfun(@min,D);

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Answer 1

KSSV 2023-1-21

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1898110-find-the-minimum-and-maximum-value-of-internal-intervals-in-an-array#answer_1153340

在 MATLAB Online 中打开

clc; clear all ;
array = [1 2   3  NaN   NaN NaN -1  0    5  NaN    0.25  NaN    5   6    7];
M = array' ; 
idx = isnan(M);
idr = diff(find([1;diff(idx);1]));
D = mat2cell(M,idr(:),size(M,2));
iwant = [] ;
for i = 1:length(D)
    if ~any(isnan(D{i}))
        iwant = [iwant  minmax(D{i}')] ;
    end
end
iwant
iwant = 1×8
    1.0000    3.0000   -1.0000    5.0000    0.2500    0.2500    5.0000    7.0000