How do I find the index of a known number? (reverse indexing?)

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Sandy
Sandy 2014-4-3
评论： Sandy 2014-4-3
I have a matrix M.
I have a number XXXX.
I want to find the index of this number within my matrix M.
How can I do this?

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Sean de Wolski
Sean de Wolski 2014-4-3
idx = find(M==xxxx)

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