matlab 2009 creating symbol

how can i crea开发者_如何学Cte symbolic variables in matlab 2009? because it doesn't work for "sym" o "syms" command.

You'll need the symbolic toolbox installed. If you have that installed, this document provides an introduction to working with it.

To see if you have the toolbox installed, just try one of the examples:

>> sqrt(sym(2)) 

You should get:

ans = 2^(1/2) 

You must use 32bits MATLAB 2009a even your OS is 64 bits. 32bits MATLAB works perfectly in 64 bits OS line win 7 and win 8.1. Even MATLAB 2007 works well for symbolic math commands. Do not use CD autorun, go to folder win32 and click setup.