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Re: differentiate multivariable InterpolatingFunction?

• To: mathgroup at smc.vnet.net
• Subject: [mg2251] Re: differentiate multivariable InterpolatingFunction?
• From: helgebe at ifi.uio.no (Helge Berglann)
• Date: Thu, 19 Oct 1995 01:37:37 -0400
• Organization: SUM/Bio

In article <DGKx16.Kx9 at wri.com>, bhunt at brians.umd.edu (Brian R. Hunt) wrote:

> I am using Mathematica 2.2.  It is possible to differentiate an
> InterpolatingFunction of 1 variable, e.g. if u is an
> InterpolatingFunction defined from 0 to 10, then I can ask for u'[3]
> or define v[x_] = D[u[x],x] or whatever.
> 
> If u is an InterpolatingFunction of 2 variables, is it possible, using
> D or Derivative or something built-in, to get a numerical value for
> the partial derivative of u with respect to it first argument at a
> specific point?  I have tried several plausible forms of syntax (and
> no doubt several implausible ones as well), but no luck.
> 
> Thanks in advance for any suggestions; an authoritative "it can't be
> done" would also be helpful so I can stop trying.
> 
> -- 
> Brian R. Hunt
> bhunt at ipst.umd.edu

There is a package available on mathsource, called DInterpolatingFunction.m

TMJ4.2/Tutorials/Abbott/DInterpolatingFunction.m

This package will do what you a ask for.

Helge Berglann
helgebe at ifi.uio.no

Helge Berglann
Tlf  jobb  22854586
Tlf hjemme 22198579