clc clear disp("ck") a=[3 7 -4 12; -5 9 10 2; 6 13 8 11; 15 5 4 1] b=a(:,2:4) c=a(2:4,:) d=a(1:2,2:4) max_3rd_row=max(a(3,:)) min_last_col=min(a(:,4))
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