unique characters in a cell

If I have a cell

x=

'sat'

'satire'

'sa'

'do'

How would I list all the unique letters that appear from the list so say uniqueletters='satiredo'

Answer 1

[Geoff Hayes]

Max - is the order in your output important? If you use first convert your cell array of strings to a single string using strjoin and then use unique to determine the unique characters, you would get

 unique(strrep(strjoin(x'),' ',''))

 ans =
    adeiorst

Note that we use strrep to replace/remove all the space characters in the joined string.