x=exp(1)
x=exp(1);
10:-2:3
rand(2,3)
round(3*rand(5,4))
A=round(3*rand(5,4))
A(6)
A(11)
A(:,[2,3])
A'
A
A^2
A.^2
A
A.^2
diag(A. ^2)
diag(A.^2)
A.^2
M=magic(5)
sum(M)
sum(M')'
max(sum(abs(M')))