How to pick all elements from a set that satisfy a certain condition?

Question

Adrian 2024-7-9，18:06

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https://ww2.mathworks.cn/matlabcentral/answers/2135913-how-to-pick-all-elements-from-a-set-that-satisfy-a-certain-condition

编辑： Fangjun Jiang 2024-7-9，19:37

Let's say I have a set of numbers A=-5,-4,-3,-2,-1,0,1,2,3,4,5

and I want to pick those pairs that give a sum of 1. For example, -2 and 3 is one possible pair, but how do we display all such pairs?

Any help will be much appreciated.

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Answer 1

Fangjun Jiang 2024-7-9，18:12

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https://ww2.mathworks.cn/matlabcentral/answers/2135913-how-to-pick-all-elements-from-a-set-that-satisfy-a-certain-condition#answer_1483478

编辑：Fangjun Jiang 2024-7-9，19:37

在 MATLAB Online 中打开

A=[-5,-4,-3,-2,-1,0,1,2,3,4,5];
index=(A+A')==1;
[I,J]=find(index);
A([I,J])
ans = 10x2
     5    -4
     4    -3
     3    -2
     2    -1
     1     0
     0     1
    -1     2
    -2     3
    -3     4
    -4     5
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