Determining unique abbreviations in a dataset

I have a dataset in the char format. For example

RPG
RTS
RTS
GBA
PSP
PS3
XBX
TBS
FFS

would be 8.

Is there a function I can use to return the number of unique abbreviations in the dataset. I have tried length(unique(x)), but that did not return the correct answer.

[Walter Roberson]

Watch out -- length() of a 1x2 vector of char would be 2 whereas you would be wanting 1 in the case there was only a single unique state in the list. size() is better for this.

[Joseph Williams]

Works like a charm. Thanks! I was thinking that there might be issues with keeping it in char format after I tried sorting them like that, so I ended up converting them to cells in the end. It seems easier to manage with the rest of the data anyhow.

Answer 1

[Walter Roberson]

size(unique(x, 'rows'),1)

Answer 2

[Azzi Abdelmalek]

s=['AK';'AZ';'CA';'CA';'IL';'ID';'ID';'MS';'NH']
out=unique(s,'rows')