What does the 'i' mean in [y,i] = unique(A)?

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Igor Batoukhtine 2016-4-28

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https://ww2.mathworks.cn/matlabcentral/answers/281508-what-does-the-i-mean-in-y-i-unique-a

评论： Star Strider 2016-4-28

If I got a m x 1 matrix and I perform this little piece of code in Matlab it returns two arrays 'y' and 'i', where 'y' holds the unique numbers en 'i' holds the row numbers of the unique numbers? I don't understand why this is. Can someone explain this to me?

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Star Strider 2016-4-28

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https://ww2.mathworks.cn/matlabcentral/answers/281508-what-does-the-i-mean-in-y-i-unique-a#answer_219857

编辑：Star Strider 2016-4-28

It’s the index into ‘A’, so that ‘y=A(i)’. It returns the index of the first instance of the unique values. If you want all of them (indirectly), you have to ask for the third argument as well.

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Igor Batoukhtine 2016-4-28

Aaaah great, thanx! I was looking at the wrong page:

Matrix Indexing in Matlab

Star Strider 2016-4-28

My pleasure!

That isn’t the ‘wrong’ page, and is definitely worth reading (I wish more posters here read it), but not the one that would provide the information you need to understand the unique function.

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