Integration

[chiwaye]

I am trying to evaluate the following integral but
Mathcad seems unable to give me an answer. Can
anyone help me?

[TomGutman]

Post the full failing worksheet.

Are you trying for a numeric or symbolic answer? A quick glance at the integrand (not really correct, you have no differential term) suggests that there will not be any closed form solution. Most integrals don't.
__________________
� � � � Tom Gutman

[ValeryOchkov]

Try please:
http://integrals.wolfram.com/index.jsp
Val
http://twt.mpei.ac.ru/ochkov/v_ochkov.htm

[chiwaye]

On 1/4/2010 2:50:10 AM, Tom_Gutman wrote:
>Post the full failing
>worksheet.
>
>Are you trying for a numeric
>or symbolic answer? A quick
>glance at the integrand (not
>really correct, you have no
>differential term) suggests
>that there will not be any
>closed form solution. Most
>integrals don't.
>__________________
>� � � � Tom Gutman


I need a symbolic answer. So what can I do. Can i
use numerical integration if there is no closed form
solution

[AlvaroDíaz]

See attached.

Regards. Alvaro.

[TomGutman]

Yes, you can use numeric integration even when (the usual case) there is no closed form solution. Symbolic solutions to integrals are few and far between.
__________________
� � � � Tom Gutman

[ptc-1368288]

On 1/4/2010 1:53:57 AM, chiwaye wrote:
>I am trying to evaluate the
>following integral but
>Mathcad seems unable to give
>me an answer. Can
>anyone help me?
_____________________________

You are suggesting that 's' is the variable of integration. Then plot first the integrand and look if it has a simplified or an otherwise form. If the Mathematica Integrator [from the web] does not find an integral function, conclude that it does not have...check. Still, you have to plot the integrand for any eventual numerical solution and any eventual region(s) of non convergence.

jmG

[ptc-1368288]

On 1/4/2010 1:53:57 AM, chiwaye wrote:
>I am trying to evaluate the
>following integral but
>Mathcad seems unable to give
>me an answer. Can
>anyone help me?
______________________________

Your *.PDF, that's not what you wrote in Mathcad.
Mathcad needs to know about the upper limit, i.e: if it is a function, a function of what... and it needs to know wrt which letter (variable) it will have to integrate. Mathcad reads equations, not text. The other comment is about the variable of integration, by not respecting the Cartesian 'x' I'm confused. The most important aspect is to source your integral with a minimum of description about the physics of it.

jmG

[ptc-1368288]

On 1/4/2010 1:53:57 AM, chiwaye wrote:
>I am trying to evaluate the
>following integral but
>Mathcad seems unable to give
>me an answer. Can
>anyone help me?
_____________________________

You have not sourced your integrand as recommended.

Then try to manage as far as help can be given.



jmG