Help with the unique function

The unique function fails to sort the following redundancy;

K>> b

b = [15.0000 15.0000 15.0000 -5.0000 15.0000]

K>> unique(b)

ans = -5.0000 15.0000 15.0000 15.0000 15.0000

but when the vector is made up of integers:

a = [15 15 15 15 -5 15]

K>> unique(ans)

ans = -5 15

How can I solve this problem?

Answer 1

[Guillaume]

If you look at the output of

b - 15

You'll see that some (or all) these 15.0000 are not actually 15.0000 but something very close to it but different from each other.

The solution: use uniquetol:

uniquetol(b);  %you can specify the tolerance as well.

[Temi]

thanks