Implicit differentiation in Matlab 7.5.0 (R2007b) ?

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farmosh203

Joined Nov 26, 2006
20
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.
 

Dave

Joined Nov 17, 2003
6,960
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 http://www.math.fsu.edu/~sachutha/MAT3930/lab9_fall05.doc (Note this is a Word document, there is a HTML version here)

Dave
 
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