Question

I have a sorted array of points like

x=[1 1 1 2 2 4 4 5 6 ......7 8 8 9 9]

I want to have an array containing 3 elements with minimum elements and 3 with maximum elements of this array (ignoring the same elements)

The desired results for the above would be

ans=[1 2 4 7 8 9]

Answer 1

You can do this using the function UNIQUE:

uniqueValues = unique(x);  %# Get the unique values of x
minmaxValues = uniqueValues([1:3 end-2:end]);  %# Get the 3 smallest and largest