a=1

a =

     1

size(a)

ans =

     1     1

a=1;
size(a);
A=[1,2,3;4,5,6]

A =

     1     2     3
     4     5     6

A(2,3)

ans =

     6

A(2,5)=1000

A =

           1           2           3           0           0
           4           5           6           0        1000

A(100,100)
??? Index exceeds matrix dimensions.

1:10

ans =

     1     2     3     4     5     6     7     8     9    10

A(1,:)

ans =

     1     2     3     0     0

A(:,2)

ans =

     2
     5

x=1:10;
x(3:end)=7

x =

     1     2     7     7     7     7     7     7     7     7

x=linspace(0,4,50); plot(x,exp(-x))
xlabel('The x-axis')
ylabel('The y-axis')
title('Exponential x-->exp(-x) on [0,4]')
print -dps fig1.ps
A=[1,2;3,4]; B=[0,1; 1,1];
A+B

ans =

     1     3
     4     5

A-B

ans =

     1     1
     2     3

A*B

ans =

     2     3
     4     7

b=[1;2];
A\b

ans =

         0
    0.5000

c=[1,0];
A*c
??? Error using ==> *
Inner matrix dimensions must agree.

A*c'

ans =

     1
     3

eye(3)

ans =

     1     0     0
     0     1     0
     0     0     1

eye(2,3)

ans =

     1     0     0
     0     1     0

ones([3,1])

ans =

     1
     1
     1

diary off