plz see my code and save 'mj' result

ci=1;
mj=[];
for vi=1:length(kp)
    if kp(vi)>=450
        mj(ci)=vi;

          ci=ci+1;
      end

end

Answer 1

[Walter Roberson]

save('SomeFileName.mat', 'mj');

By the way:

mj = find(kp >= 450);