a=2.5
a =
    2.5000
a = 2.5000
a =
    2.5000
a=[1 2 3]
a =
     1     2     3
a = [1,2,3]
a =
     1     2     3
a=[1 2 3;4 5 6; 7 8 10]
a =
     1     2     3
     4     5     6
     7     8    10
f=a(2,1)
f =
     4
g=a(2:3,2)
g =
     5
     8
h=a(2,2:3)
h =
     5     6
b=[1 2;3 4]
b =
     1     2
     3     4
d=inv(b)
d =
   -2.0000    1.0000
    1.5000   -0.5000
t=[0:0.1:20]';
for i=1 : 1 : 201
x(i)=sin(t(i))*(t(i)^2);
end
y=sin(t).*(t.^2);
plot(t,y)
z=1+2i
z =
   1.0000 + 2.0000i
z=1.0000 + 2.0000i
z =
   1.0000 + 2.0000i
r=abs(z)
r =
    2.2361
theta=angle(z)
theta =
    1.1071
fz=(z+1)/(z*(z^2-4*z+5)*(z-1));
fz
fz =
   0.1400 + 0.0200i
pol1=[1 6 11 6];
rt1=roots(pol1);
rt1
rt1 =
   -3.0000
   -2.0000
   -1.0000
pol2=[1 4 4]; rt2=roots(pol2)
rt2 =
    -2
    -2
pol3=[1 1 1]; rt3=roots(pol3)
rt3 =
  -0.5000 + 0.8660i
  -0.5000 - 0.8660i
f1=poly(rt1);
f1
f1 =
    1.0000    6.0000   11.0000    6.0000
num1=[3 7];
den1=[1 6 11 6];
[r,p,k]=residue(num1,den1);
r
r =
   -1.0000
   -1.0000
    2.0000
p
p =
   -3.0000
   -2.0000
   -1.0000
k
k =
     []
t=[0:0.1:20];
f=1-2*exp(-.24*t).*(cos(2*t));
plot(t,f)
xlabel('The t axis ')
ylabel('The f axis ')
title('The plot of f versus t ')
grid on
diary off