p=1:2:16

p =

     1     3     5     7     9    11    13    15

v=1:4

v =

     1     2     3     4

v=[5 v]

v =

     5     1     2     3     4

v=[v(1:2),6,v(3:5)]

v =

     5     1     6     2     3     4

v(3:end)

ans =

     6     2     3     4

size(v)

ans =

     1     6

v=1:20

v =

  Columns 1 through 13 

     1     2     3     4     5     6     7     8     9    10    11    12    13

  Columns 14 through 20 

    14    15    16    17    18    19    20

v(11:end)=[]

v =

     1     2     3     4     5     6     7     8     9    10