clc
close all
clear all

A = ones(3,2)
B = 2*ones(2,3)
C = 3*ones(1,3)
D = 4*ones(1,5)

A([1 2])
E = [A,[B;C];D]
E(2:4,2:end)
B(3:end)
F = [5:-1:1;5:-1:1]
G = linspace(9,77,11)
max(E')
min(E)
max(max(E))
min(min(E))
sum(E)
H = pascal(6)



H = rand(5)

[I,J] = find(H>0.2 & H<0.4)

size(H)
size(H,2)

R1 = [1:2:21]
R2 = []
Z = magic(6)
ZZT' = Z.*Z'