>> 
>> 
>> x = [4,1,6,8,2,7,9];
>> x(3)

ans =

     6

>> 
>> 
>> x(1:5)

ans =

     4     1     6     8     2

>> 
>> 
>> x(4:end)

ans =

     8     2     7     9

>> x(end:-2:1)

ans =

     9     2     6     4

>> 
>> 
>> x([1,5,3,2,2])

ans =

     4     2     6     1     1

>> 
>> 
>> sum(x)

ans =

    37

>> 
>> 
>> x = (16:2:49);
>> x

x =

    16    18    20    22    24    26    28    30    32    34    36    38    40    42    44    46    48

>> x = (16:2:49);
>> x = (16:2:49)

x =

    16    18    20    22    24    26    28    30    32    34    36    38    40    42    44    46    48

>> 
>> 
>> 
>> x = [2,9,7,5,3]

x =

     2     9     7     5     3

>> 
>> x-11 

ans =

    -9    -2    -4    -6    -8

>> x*2

ans =

     4    18    14    10     6

>> x.*2

ans =

     4    18    14    10     6

>> x.^2

ans =

     4    81    49    25     9

>> x'

ans =

     2
     9
     7
     5
     3

>> x = [3,2,6,8]'

x =

     3
     2
     6
     8

>> y = [4,1,3,5]'

y =

     4
     1
     3
     5

>> y+sum(x)

ans =

    23
    20
    22
    24

>> x.^y

ans =

          81
           2
         216
       32768

>> x./y

ans =

    0.7500
    2.0000
    2.0000
    1.6000

>> 
>> 
>> z = zeros(1,50)

z =

  Columns 1 through 21

     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0

  Columns 22 through 42

     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0

  Columns 43 through 50

     0     0     0     0     0     0     0     0

>> o = ones(1,50)

o =

  Columns 1 through 21

     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1

  Columns 22 through 42

     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1     1

  Columns 43 through 50

     1     1     1     1     1     1     1     1

>> r = round(rand(1,50)*10)

r =

  Columns 1 through 21

     8     9     1     9     6     1     3     5    10    10     2    10    10     5     8     1     4     9     8    10     7

  Columns 22 through 42

     0     8     9     7     8     7     4     7     2     7     0     3     0     1     8     7     3    10     0     4     4

  Columns 43 through 50

     8     8     2     5     4     6     7     8

>> 
>> figure
>> hold on
>> plot(z,'b'); plot(o,'k'); plot(r, 'm')
>> hold off
>> 
>> 
>> figure
>> hold on
>> stem(z,'r');stem(o,'g'); stem(r,'y')
>> hold off
>>
subplot(2,1,1)
hold on
plot(z,'r');plot(o,'k'); plot(r,'b')
hold off
subplot(2,1,2)
hold on
stem(z,'m'); stem(o,'g'); stem(r,'k')
hold off
>> M = [2,4,1;6,7,2;3,5,9]

M =

     2     4     1
     6     7     2
     3     5     9

>> Msub = M(1:2,:)

Msub =

     2     4     1
     6     7     2

>> sum(M(1,:))

ans =

     7

>> sum(M(2,:))

ans =

    15

>> sum(M(3,:))

ans =

    17

>> sum(M(:,1))

ans =

    11

>> 
>> sum(M(:,2))

ans =

    16

>> sum(M(:,3))

ans =

    12

>> load gong.mat
>> soundsc(y)
>> audiowrite('gong.wav',y,Fs)

>> load handel.mat
>> soundsc(y)
>> audiowrite('handel.wav',y,Fs)
>>