MATLAB 3

1.
A=magic(3);
B=zeros(3,1);
C=rand(3,4);
D=[A,B;C];
a=D(:,1);
b=D(:,3);
save E:/homework D;
a,b
a =
    8.0000
    3.0000
    4.0000
    0.2290
    0.9133
    0.1524
b =
    6.0000
    7.0000
    2.0000
    0.0782
    0.4427
    0.1067

2.
load('homework.mat')
E=D';
E;
E =
    8.0000    3.0000    4.0000    0.2290    0.9133    0.1524
    1.0000    5.0000    9.0000    0.8258    0.5383    0.9961
    6.0000    7.0000    2.0000    0.0782    0.4427    0.1067
         0         0         0    0.9619    0.0046    0.7749

3.
F=eye(4);
G=triu(F);
G;
G =
     1     0     0     0
     0     1     0     0
     0     0     1     0
     0     0     0     1

4.
H=rand(4,5);
I=H(1:3,1:3);
c=find(I>0.3);
J=I(c);
J;
J =
    0.9421
    0.5752
    0.8212