Elements in a matrix

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Maik Petersen
Maik Petersen 2014-1-4
回答： Maik Petersen 2014-1-4
Hello,
When I have a certain matrix, is there a possibility to check whether some value is on more than one position in the matrix.
So for example the identity matrix 3-by-3, how can I check whether the value '1' is multiple times there in the matrix?
Thanks in advance.

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2014-1-4
Idx=find(A==1)

更多回答（2 个）

Walter Roberson
Walter Roberson 2014-1-4
sum(TheMatrix(:) == TheValue) > 1
In the more general case where you want to know whether any value is repeated, see unique()
Maik Petersen
Maik Petersen 2014-1-4
You guys are great, thanks!

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