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differentiate multivariable InterpolatingFunction?
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' 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