function kmeans is not able to process uint8 what should i do?

Question

Poonam 2015-3-2

评论： David Young 2015-3-2

I am using kmeans function and getting following error

??? Error using ==> plus Integers can only be combined with integers of the same class, or scalar doubles.

Error in ==> kmeans>distfun at 704 D(:,i) = D(:,i) + (X(:,j) - C(i,j)).^2;

Error in ==> kmeans at 313 D = distfun(X, C, distance, 0);

What should i do know

Answer 1

David Young 2015-3-2

Convert your date to double before passing it to kmeans. For example, if Xi is your uint8 data array,

Xd = double(Xi);
idx = kmeans(Xd, k);

If you have very large arrays and so run out of memory, consider using single instead of double.

Poonam 2015-3-2

done as you said but now getting ??? Error using ==> minus Number of array dimensions must match for binary array op.

Error in ==> kmeans>onlineUpdate at 557 Del(:,i) = (m(i) ./ (m(i) + sgn)) .* sum((X - C(repmat(i,n,1),:)).^2, 2);

Error in ==> kmeans at 324 converged = onlineUpdate();

David Young 2015-3-2

Sorry, there isn't enough information to solve this new problem. I suggest you post a new question, showing the code that calls kmeans.