13. The following program calculates X=[3 7 2 9 1; 5 7 8 10 11;5-40-2 -1; 8 3-3 40 13] for i=1:4 S=0; M=1; for j=1:length(x) if isprime(x(1,1)) S=S+X(i,j); else M=M*X(i,j); end; end; disp(s); disp(M); end; 13. The following program calculates X=[3 7 2 9 1; 5 7 8 10 11;5-40-2 -1; 8 3-3 40 13] for i=1:4 S=0; M=1; for j=1:length(x) if isprime(x(1,1)) S=S+X(i,j); else M=M*X(i,j); end; end; disp(s); disp(M); end