Statistics Toolbox

prctile

Percentiles of a sample.

Syntax

Y = prctile(X,p)

Description

Y = prctile(X,p) calculates a value that is greater than p percent of the values in X. The values of p must lie in the interval [0 100].

For vectors, prctile(X,p) is the pth percentile of the elements in X. For instance, if p = 50 then Y is the median of X.

For matrix X and scalar p, prctile(X,p) is a row vector containing the pth percentile of each column. If p is a vector, the ith row of Y is p(i) of X.

Examples

x = (1:5)'*(1:5)
x =
     1     2     3     4     5
     2     4     6     8    10
     3     6     9    12    15
     4     8    12    16    20
     5    10    15    20    25
y = prctile(x,[25 50 75])
y =
    1.7500    3.5000    5.2500    7.0000    8.7500
    3.0000    6.0000    9.0000   12.0000   15.0000
    4.2500    8.5000   12.7500   17.0000   21.2500

polyval

princomp