How to count number of states in array?

Hi,

I want to count number of states in vector, each number represent a state: Ex.

 A = [1;1;0;1;0]
 B = [2;2;1;0;1]
 C = [1;1;1;1;1]

A has two states 1 and 0 ==> k=2, B has three states 1, 2, 0 ==> k=3, and C has zero state ==> k=0. how can I write a proforma to define k (number of states)?

[Les Beckham]

Your question has an inconsistency that you should explain. If "each number represent a state" then why do you say that "C has zero state"?

C has one (and only one) number, thus (it seems to me) that would be one "state".

If you are counting state changes then your example is still inconsistent. A and B each have three state changes while C has zero.

I think that Walter's answer makes the most sense given the inconsistency of your question.

[Walter Roberson]

If necessary, my suggestion could be followed by testing if the result was 1, and if so then change it to 0.

[AbuYusuf]

you are right Les, I made a mistake in my question. For C, it should be one state.

I was looking exactly to the line of code which Wlater suggested. Thanks both for your comments.

Answer 1

[Walter Roberson]

length(unique(TheVector))