%  
%  Math 551 lecture 1/31/13 
%   
%  A few short demos of derivtd_2, diff, etc.
%

derivtd_2
enter a =1
enter n =20
enter noise level delta =.0000001
derivtd_2
enter a =1
enter n =20
enter noise level delta =.000001

home
x=[1 3 4 7] 

x =

     1     3     4     7

diff(x)

ans =

     2     1     3

derivtd_2
enter a =1
enter n =20
enter noise level delta =0
home
A=[2 1;1 2]

A =

     2     1
     1     2

x=[1;-1] 

x =

     1
    -1

A*x

ans =

     1
    -1

home
A(:,1)

ans =

     2
     1

x(1)*A(:,1)+x(2)*A(:,2)

ans =

     1
    -1

x=[1 3 4 7]

x =

     1     3     4     7

y=[1;2;3;4]

y =

     1
     2
     3
     4

x*y

ans =

    47

x

x =

     1     3     4     7

x'

ans =

     1
     3
     4
     7

x(1)=1+i

x =

  Column 1

  1.000000000000000 + 1.000000000000000i

  Column 2

  3.000000000000000                     

  Column 3

  4.000000000000000                     

  Column 4

  7.000000000000000                     

x'

ans =

  1.000000000000000 - 1.000000000000000i
  3.000000000000000                     
  4.000000000000000                     
  7.000000000000000                     

x.'

ans =

  1.000000000000000 + 1.000000000000000i
  3.000000000000000                     
  4.000000000000000                     
  7.000000000000000                     

diary off