How do I prevent duplicate indexes in an array from subtracting to each other when it satisfies the condition the 1st time?

Question

Brandon Tsang 2023-1-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1896035-how-do-i-prevent-duplicate-indexes-in-an-array-from-subtracting-to-each-other-when-it-satisfies-the

编辑： Dyuman Joshi 2023-1-19

采纳的回答： Dyuman Joshi

matA = [21 36 172 246 259 274 303 311 316 322 340 375 377 378 382 396 483 508]

matB = [39 116 198 203 309 314 364 421]

A = 1:1:numel(matA); B=1:1:numel(matB)

for i = A

for j = B

if matA(i) > matB(j)

matA(i)-matB(j)

end

%order: 172-39=133, 172-116=56, 246-116=130, 246-39=207,246-198=48

%What I want outputted from: 133, 56, 48 (prevent 130 and 207 from happening)

Matlab output:

ans = 133

ans = 56

ans = 207

ans = 130

ans = 48

ans = 43

etc...

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Answer 1

Dyuman Joshi 2023-1-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1896035-how-do-i-prevent-duplicate-indexes-in-an-array-from-subtracting-to-each-other-when-it-satisfies-the#answer_1150985

在 MATLAB Online 中打开

matA = [21 36 172 246 259 274 303 311 316 322 340 375 377 378 382 396 483 508];
matB = [39 116 198 203 309 314 364 421];
idx=[];
for i = 1:numel(matA)
    for j = setdiff(1:numel(matB),idx)
            if matA(i) > matB(j) 
                matA(i)-matB(j)
                idx=[idx j];
            end  
    end
end
ans = 133
ans = 56
ans = 48
ans = 43
ans = 2
ans = 2
ans = 11
ans = 62

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Brandon Tsang 2023-1-19

Thanks Dyuman! How would you go about outputting only the highest value out of all the generated for loop outputs?

Dyuman Joshi 2023-1-19

编辑：Dyuman Joshi 2023-1-19

在 MATLAB Online 中打开

You can use a value and update it as per the condition -

matA = [21 36 172 246 259 274 303 311 316 322 340 375 377 378 382 396 483 508];
matB = [39 116 198 203 309 314 364 421];
idx=[];
y=-Inf;
for id = 1:numel(matA)
    for jd = setdiff(1:numel(matB),idx)
            if matA(id) > matB(jd) 
                y=max(y,matA(id)-matB(jd));
                idx=[idx jd];
            end  
    end
end
y
y = 133