Finding threshold of matrix

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MSP
MSP le 16 Sep 2017
Commenté : Walter Roberson le 16 Sep 2017
Suppose u have a matrix A with rand (i.e 0-1). Now a threshold(x) of A is to be determined so that 70% of values of the given matrix A are greater than the threshold(x).

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Walter Roberson
Walter Roberson le 16 Sep 2017
sort() and index 3/10 of the way through.
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MSP
MSP le 16 Sep 2017
would that be faster than doing percentile
Walter Roberson
Walter Roberson le 16 Sep 2017
Yes. See the Algorithms section of https://www.mathworks.com/help/stats/prctile.html#btgyzpd-1 which describes the algorithm prctile uses.

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