fprintf vector with variable size

I want to display values of variable in the code while the code is running. Problem is that size of one of the variable is not fixed. For example it is a vector and can be 3x1 or 6x1 or 9x1. I am not sure how I can use fprintf() for this. For example, k1=2, k2=45, a_det = [3;5;7]

or k1=3, k2=34, a_det = [2;5;7;9;4]

This is what I have:

fid = fopen('ADMM_Release.csv','wt');  
  for k1 = 1:1000
        for k2 = 1:200
            fprintf(fid, '%12.6f %12.6f %12.6f %12.6f %12.6f %12.6f %12.6f\n', k1, k2, time_Release_MIQP, rho, a_det ) ;
        end
    end
    fclose(fileID);

[Sullivan Hidot]

Hi Isha, To deal with the various size of a variable, you have to convert 'a_det' into string then remove brackets and replace ';' by spaces. For example :

a=4;

b=5;

a_det=[1;2;3];

fprintf('%d %d %s\n', a, b, replace(regexprep(mat2str(a_det), '[[|]]', ''), ';', ' '))

Hope this helps

[Walter Roberson]

This appears to duplicate a different Question, which was answered at https://www.mathworks.com/matlabcentral/answers/390839-fprintf-to-display-variables#comment_550367

The solution has nothing to do with regexprep