Implicit differentiation in Matlab 7.5.0 (R2007b) ?

Thread Starter


Joined Nov 26, 2006
I was trying to look up the command to help a friend with his homework for implicit differentiation. I couldn't find it in the help menu and the following code gave me:

>> clear
>> syms x y
>> H = y^2-x^3*(2-x);
>> idiff(H,x,y)
??? Undefined function or method 'idiff' for input arguments of type 'sym'.

Does anyone know the command to implicitly differentiate? Thanks.


Joined Nov 17, 2003
I haven't tried this myself: Couldn't you use the differentated function derived through the DIFF function, then multiply the function by \[\frac{d}{dx_{i}}\], where \[dx\]\[_{i}\] is the ith variable in a multivariable equation?

Actually have a look at (Note this is a Word document, there is a HTML version here)