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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.

J|rgen
-----Original Message-----
From: Volker Doerr <vd@cascade.de>
To: mathgroup@smc.vnet.net
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
>vd@cascade.de
>
>
>




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