Re: Integrate is driving me crazy, please help!
- To: mathgroup at smc.vnet.net
- Subject: [mg56213] Re: Integrate is driving me crazy, please help!
- From: nafod40 <noneya at business.com>
- Date: Tue, 19 Apr 2005 04:55:26 -0400 (EDT)
- Organization: Penn State University, Center for Academic Computing
- References: <d3vn1h$jm9$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Jim Martin wrote:
> Hello Mathematica Experts:
>
> I am a biomechanist and work mostly in the area of muscle contraction. I
> do a lot of numerical computations using excel, but right now I need an
> analytical solution that represents force as a function of position
> integrated over a shortening amplitude. I downloaded a trial version of
> Mathematica and have tried to obtain a solution for this:
>
> Integrate[(hillb*((f0 + hilla)/(2*pi*f*a*Cos(ArcSin(x/a)) + hillb))) -
> hilla, {x, -a, a}]
You need to write the cosine of x as Cos[x], not Cos(x).
Also write the constant pi as "Pi" with caps on first letter.
That ought to do it.