argmin function for clustering fcmdd?

Hello everyone!

I don't know much about how "argmin" works, so I have a problem asking you to help me:

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Input:

• Given a matrix u, (size N by c)
• Given vector X (size N by 1)

%Given a matrix D (size N by N): (D is the matrix for each element D(i, j) = x (i) . (x (j))
D=pdist2(X,X);%not use pdist function

Output:

The matrix Z is of size c x 1, Z is a subset of x, such that:

for i=1:c

Z(i)=X(q);
end

I do not know how to code "the argmin formula" as above.

Please help me.