Finding threshold of matrix

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MSP
MSP el 16 de Sept. de 2017
Comentada: Walter Roberson el 16 de Sept. de 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 el 16 de Sept. de 2017
sort() and index 3/10 of the way through.
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MSP
MSP el 16 de Sept. de 2017
would that be faster than doing percentile
Walter Roberson
Walter Roberson el 16 de Sept. de 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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