Sort elements of Array by given condition

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Daniel 2022-12-28

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https://ww2.mathworks.cn/matlabcentral/answers/1885622-sort-elements-of-array-by-given-condition

编辑： Matt J 2022-12-28

采纳的回答： Matt J

在 MATLAB Online 中打开

Hello,

i have a vector n 480x1 and would like to sort the vector so that the condition

sum(([n ;0]-[0 ;n])>0)==68

is given. How could i do this? my approach was to realize a permutation of the vector until the condition is given. Unfortnely, this takes too much time.

Thanks in advance

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Daniel 2022-12-28

vector.mat

There is the data. Thanks a lot!

Torsten 2022-12-28

编辑：Torsten 2022-12-28

For that there are 68 pairs such that

n(i+1) - n(i) > 0, n(0) = 0 (i=0,...,67)

your array must have at least 68 different elements.

Yours has only 27.

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采纳的回答

Matt J 2022-12-28

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https://ww2.mathworks.cn/matlabcentral/answers/1885622-sort-elements-of-array-by-given-condition#answer_1137607

编辑：Matt J 2022-12-28

在 MATLAB Online 中打开

vector.mat

n=load('vector').xr;
m=numel(n);
n=n(randperm(m));
loc=find(([n ;0]-[0 ;n])>0);
n(loc(68):end)=sort(n(loc(68):end),'descend');
sum(([n ;0]-[0 ;n])>0)
ans = 68

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Sulaymon Eshkabilov 2022-12-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1885622-sort-elements-of-array-by-given-condition#answer_1137592

在 MATLAB Online 中打开

vector.mat

load('vector.mat')
XR1 = [xr;0]; XR2 = [0;xr]; 
IND = (XR1-XR2)>0;
ii = 1;
S = 0;
while S~=68
    S(ii+1) = S(ii)+IND(ii);
    ii=ii+1;
end
fprintf('Summation is halted at %d step  and the sum is %d \n', ii, S(ii))    
Summation is halted at 226 step  and the sum is 68 