Matlab 5 Symbolic Differences

%%% 'version 5 matlab'

There are now objects: important are 

    sym     symbolic
    char    strings
    
important functions 
    sym     declaratio   
    sym2map(a)
    subs   new syntax
    M4  subs('x^2','xnew','x')
    M5  subs(x^2, x ,xnew)    but after  syms x new  !!!
    
see some examples in the capture below    
------------------------------------------------
%% You declare symbolic objects
>> syms a b c x y
>> a=c*x^3+b^2
a = 
c*x^3+b^2
u=[ 'y=' sym2map(a) ]     % convert symbolic to string
u =
 y=c*x^3+b^2
>> eval(u)
y =
 c*x^3+b^2
>> diff(y,x)
ans =
 3*c*x^2
 >> whos
  Name      Size         Bytes  Class
  a         1x1            142  sym object
  ans       1x1            138  sym object
  b         1x1            126  sym object
  c         1x1            126  sym object
  u         1x11            22  char array
  x         1x1            126  sym object
  y         1x1            142  sym object

Grand total is 45 elements using 822 bytes
>> v=strrep(u,'y','z')   % doing a string operation
v =
z=c*x^3+b^2
>> b=subs(a,x,y)
b =
 c*(c*x^3+b^2)^3+b^2
>> a
a =
 c*x^3+b^2
>> syms xx       % declare a new symbolic
>> b=subs(a,x,xx)   % doing a symbolic replacement 
b =
 c*xx^3+b^2
>> maple('with orthopoly;')
The Extend_Symbolic_Toolbox feature is not currently licensed.
Contact MathWorks to obtain a valid license.
'with(...)' requires extended symbolic toolbox.
??? Unable to checkout a license for the Extended Symbolic Toolbox
>> a 
a =
 c*x^3+b^2
>> b 
b =
 c*xx^3+b^2
 >> c
c =
 c 
>> a+b+c 
ans = 
 c*x^3+2*b^2+c*xx^3+c