Implicit differentiation in Matlab 7.5.0 (R2007b) ?

Discussion in 'Programmer's Corner' started by farmosh203, Jan 17, 2008.

  1. farmosh203

    Thread Starter Member

    Nov 26, 2006
    20
    0
    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.
     
  2. Dave

    Retired Moderator

    Nov 17, 2003
    6,960
    144
    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
     
  3. farmosh203

    Thread Starter Member

    Nov 26, 2006
    20
    0
    Great, thanks for the link Dave.
     
Loading...