Newbie questions about Ocatave

[octavenoob]

Hello all, 

How do I make a symbolic expression and take partial derivatives of that
function. For example, in Matlab I would do this: 

syms  b c d e f % Alerts matlab that these variables have no set value to
them

a = b*2+ (d^e+f*e/f^2) %my expression

da=diff(a,'e') %takes the derivative of a with respect to e

b=1 %values for the variables 
c=2
d=3
e=4
f=5

z=eval(da) % this will plug in the values above and evaluate the expression
da, which is the derivative of function a with respect to e. 
--------

So far octave does not seem to be recognizing  'syms'. How do I make a
program like this Octave compatible?
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