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Re: integrate problem
*To*: mathgroup at smc.vnet.net
*Subject*: [mg98862] Re: integrate problem
*From*: Bill Rowe <readnews at sbcglobal.net>
*Date*: Mon, 20 Apr 2009 19:09:54 -0400 (EDT)
On 4/20/09 at 5:39 AM, sean_incali at yahoo.com wrote:
>I'm having some issues understanding this... Following works as
>expected.
>s is the variable in time. a is a parameter.
>Integrate[1/(s + a), s]
>gives Log[a + s]
>But the following gives the integral itself.
>Integrate[1/(s[t] + a), t]
If I asked you to integrate an arbitrary function of time and
*did not* specify any details of the function could you do it?
Note, this is exactly what you are asking Mathematica to do.
>If the function that needs to be integrated w.r.t time is 1/(s[t] +
>a), how do I accomplish that?
define s[t] before asking Mathematica to do the integration
>It seems like if integrate it wrt to s [t] it will work.
>Integrate[1/(s[t] + a), s[t]]
This is no different than
Integrate[1/(s + a), s]
If you want a solution in terms of t, you first have to define
s[t]. There is no other way.
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