Extra commas when using fprintf

Well, my problem is that within the for loop im printing the number of iterartions and the old means using fprintf. The only problem is that it adds a extra comma to the end of the old means when its not needed. I have treid to google the solution, still can't find an answer. Below is the code when i print the iterations and the old means.

I have also attached a picture of what it looks like.

for i =1:I
    %     print out iterations
    fprintf("\n Iterations: %d \n",i );
    fprintf(" Old Means: ");
    fprintf("(");
    fprintf("%.4f," ,M(:,:,i));
    fprintf(")");
    
    
    
    %         fprintf("\n Clusters: (%d,%d,%d,%d,%d,%d,%d,%d,)" ,C());
    %       fprintf("\n New means: \n")
    %
    %    fprintf(" Old Means: %.4f,%.4f,%.4f,%.4f,%.4f \n ",M(:,:,:));
    
end

Answer 1

[Guillaume]

Personally, I'd use:

    fprintf(" Old Means: (%s)", strjoin(compose('%.4f', M(:, :, i)), ','));

Answer 2

[Walter Roberson]

Replace

fprintf("%.4f," ,M(:,:,i));

With

Temp = M(:, :, i) ;
fprintf("%.4f," ,Temp(1:end-1) );
fprintf("%.4f", Temp(end)) ;

There are other approaches, such as computing the format according to the data size with repmat, and zapping the final comma before using the format.