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Re: differentiate multivariable InterpolatingFunction?

bhunt at (Brian R. Hunt) wrote:

>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.

Have a look at the Tricks of the Trade column in The Mathematica 
Journal, 4(2), p31.  There the package DInterpolatingFunction is used 
which allows you to compute partial derivatives.  You can get this 
package from MathSource: 


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