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Topic: Derivatives of InterpolatingFunctions
Replies: 2   Last Post: Oct 30, 1996 12:22 AM

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Paul E Howland

Posts: 7
Registered: 12/7/04
Derivatives of InterpolatingFunctions
Posted: Oct 19, 1996 4:17 PM
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I'm using an InterpolatingFunction to model a set of data that is a
function of three variables (range,height,frequency). I need to
generate the partial derivatives of this InterpolatingFunction with
respect to each of the variables. Unfortunately, version 2.2 of
Mathematica appears unable to do this, unless the
InterpolatingFunction is a function of only one variable.

My questions are:
1. Has this been fixed in v3.0 of Mathematica?
2. If not, has anyone written a package to address this shortfall?

I know I could approximate the derivative using something along the
lines of (f[x+dx,y,z]-f[x-dx,y,z])/(2dx), but I suspect that this
could lead to problems if I make the wrong choice of dx. Does anyone
care to comment?

Many thanks,

Paul


__________________________________________________________

Paul E Howland, MEng CEng MIEE Tel +44-1684-895767
Long Range Ground Radar Sensors Fax +44-1684-896315
DRA Malvern
Malvern, Worcs, UK
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