MATLAB: How to find max and min value from .mat file and save it to an other array

Question

for i=1:10
    j(i)=i*0.5:
    end 
j = sort( j );
save('j.mat', 'j');

how can i find the max and min value from j.mat and save it to an other array?

Answer 1

 S = load('j.mat', 'j');
 minmax = [min(S.j) max(S.j)];
 save('jminmax.mat', minmax);