Jacobian function not found

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Jean
Jean 2011-10-10
Hello to all,
I have to use the "jacobian" function in Matlab. I have the Symbolic toolbox installed, but upon running jacobian(a, b), the prompt tells me :
??? Undefined function or variable 'jacobian'.
What should I do?
Best regards,
Jean

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采纳的回答

Wayne King
Wayne King 2011-10-10
If you enter
>>ver
Do you see an entry for the Symbolic Toolbox?
If you enter:
license('test','symbolic_toolbox')
Do you get a 1 back? You may think you installed it, but perhaps something went wrong.
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Walter Roberson
Walter Roberson 2011-12-5
jacobian is a method of the symbolic class, so you have to invoke it with a symbolic argument for it to be located.
For example,
jacobian(sym('x^2+3*x*y-y^3'))
Karen
Karen 2011-12-5
got it :) Thanks!

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Walter Roberson
Walter Roberson 2011-10-10
Which version are you using? I trace the function back at least as far as R14

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