a = [1 2 3 4 6 4 3 4 5]

a =

   1   2   3   4   6   4   3   4   5

b = a + 2

b =

   3   4   5   6   8   6   5   6   7

plot(b)
grid on

bar(b)
xlabel('Sample #')
ylabel('Pounds')

plot(b,'*')
axis([0 10 0 10])

A = [1 2 0; 2 5 -1; 4 10 -1]

A =

    1    2    0
    2    5   -1
    4   10   -1

B = A'

B =

    1    2    4
    2    5   10
    0   -1   -1

C = A * B

C =

     5    12    24
    12    30    59
    24    59   117

C = A .* B

C =

    1    4    0
    4   25  -10
    0  -10    1

b = [1;3;5]
x = A\b

b =

   1
   3
   5

x =

   1
  -0
  -1

r = A*x - b

r =

   0
   0
   0

eig(A)

ans =

   3.73205
   0.26795
   1.00000

svd(A)

ans =

   12.31706
    0.51490
    0.15768

p = round(poly(A))

p =

   1  -5   5  -1

roots(p)

ans =

   3.73205
   1.00000
   0.26795

q = conv(p,p)

q =

    1  -10   35  -52   35  -10    1

r = conv(p,q)
plot(r);

r =

     1   -15    90  -278   480  -480   278   -90    15    -1

whos

Variables in the current scope:

   Attr Name             Size                     Bytes  Class
   ==== ====             ====                     =====  ===== 
        A                3x3                         72  double
        B                3x3                         72  double
        C                3x3                         72  double
        _fig             1x1                          8  double
        _figHandles      1x1                          8  double
        _filename        1x27                        27  char
        _handle          1x1                          8  double
        a                1x9                         72  double
        ans              3x1                         24  double
        b                3x1                         24  double
        p                1x4                         32  double
        q                1x7                         56  double
        r                1x10                        80  double
        theta            1x6284                      24  double
        x                3x1                         24  double

Total is 6380 elements using 603 bytes

A

A =

    1    2    0
    2    5   -1
    4   10   -1

sqrt(-1)

ans =  0 + 1i