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MathGroup Archive 1998

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Re: Values from InterpolatingFunction

Hallo Volker,
I imagine you did something like the following:

In[72]:= f = FunctionInterpolation[x^2, {x, 0, 2}]

Out[72]= InterpolatingFunction[{{0,2.}},"<>"]

In[76]:= D[f[t],t]

Out[76]= InterpolatingFunction[{{0,2.}},"<>"][t]

and then you were stuck.

Write instead

In[77]:= g[t_]=D[f[t],t]

Out[77]= InterpolatingFunction[{{0,2.}},"<>"][t]

and use g to find your values.

-----Original Message-----
From: Volker Doerr <>
Subject: [mg11875] [mg11847] Values from InterpolatingFunction

>Hello to all,
>I have the following
>   InterpolatingFunction[{{0.,365.}},<>][t]
>produced by Function D from another InterpolatingFunction, and want
>simply to get the approximate values at specific  points. I cannot find
>a direct solution, probably because  the function has symbolic form.
>Anybody out there who can help me?
>Thanx a lot,
>V o l k e r

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