How to extract all the elements in a vector whose index is 1?

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Cantor Set
Cantor Set 2020-2-12
编辑： Adam Danz 2020-2-13
Given a vector R:
R=[0.7 9 8 34 2]'; ranks=[1 2 2 2 3];
Where the first element in ranks crossponds to the rank of the first element in R and the second element in ranks crossponds to the second element in R and so on.
I need to extract all the elements whose ranks are 2 and put them in a vector but I need a general way because the sizes of the vectors R and ranks will vary
I appreciate your help
thank you

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回答（1 个）

Adam Danz
Adam Danz 2020-2-12
编辑：Adam Danz 2020-2-13
x = R(ranks == 2)
Indexing is one of the most important tools in Matlab. This is a good resource to get you started.
https://www.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html

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