       Using NDSolve and Finding a specific Value

• To: mathgroup at smc.vnet.net
• Subject: [mg85354] Using NDSolve and Finding a specific Value
• From: Tara.Ann.Lorenz at gmail.com
• Date: Thu, 7 Feb 2008 04:44:28 -0500 (EST)

```Hello.

I am having an issue related to the NDSolve function (I am using
Version 6).  The following example illustrates the problem I am
having:

Input:
sols = NDSolve[{i'[t] == (1/8.516011) (-i[t] + 0.596120754),
i == 0.219319}, i[t], {t, 1, 4}]

Output:
{{i[t]->InterpolatingFunction[{{1.,4.}},<>][t]}}

I then would like to solve i[t] for t=3.8
According to the Mathematica website, I should be able to enter the

i[3.8]/.sols

However, my output is simply i[3.8] and not a numerical value.  What
else can I try to get a numerical value from the interpolating
function.

I appreciate any feedback. Thank you

```

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