Unique values per row

Hi all, I'm struggling to figure a simple method to determine the number of unique values per row in a matrix. For example in the matrix [1 2 3; 4 4 5; 6 6 6]

I would expect the result to be [3, 2, 1] I've tried using unique() and histc but neither are giving me the result I am looking for. Thanks!

[Stephan]

Please explain the thoughts that lead to your expected result.

[Zee Imports]

Hi, As there are 3x unique values in row 1, 2x unique values in row 2 and 1x unique values in row 3.

I have basically windowed an audio signal into a matrix and am now trying to find the number of unique values in each window

Answer 1

[Bruno Luong]

>> A=[1 2 3; 4 4 5; 6 6 6]

A =

       1     2     3
       4     4     5
       6     6     6

>> sum(diff(sort(A,2),1,2)~=0,2)+1

ans =

       3
       2
       1

[Zee Imports]

Thanks!

Answer 2

[Walter Roberson]

There is a vectorized way to compute this but it is not simple and it quickly gets expensive to calculate. Easier is

cellfun(@(c) length(unique(c)), num2cell(YourMatrix, 2))

[Zee Imports]

Thanks!