Why Does Maple Return Symbolic Answers When Integrating Functions?

[kubekas]

Hi every body

I am trying to intergrate the following function using Maple:

j2out(x):=c2*x*exp(int((s-vout(s))/s/vout(s),s=0.0015..x));

where vout(s)=0.07595560773650. C2 is constant

but when I do, it returns a symbolic answers i.e Maple just returns the original expression without doing any thing even if I try evalf.

Any suggestion out there?
Amos

 

[g_edgar]

c2*x*exp(int((s-vout(s))/s/vout(s),s=0.0015..x));

$${\it c2}\,x{{\rm e}^{\int _{ 0.0015}^{x}\!{\frac {s-{\it vout} \left( s \right) }{s{\it vout} \left( s \right) }}{ds}}}$$

subs({vout(s)=0.07595560773650, c2=2.3456, x=1.92},%);

$$4.503552\,{{\rm e}^{\int _{ 0.0015}^{ 1.92}\! 13.16558487\,{\frac {s- 0.07595560773650}{s}}{ds}}}$$

evalf(%);

$$3.279676846\;10^8$$

 

[oswaler]

Hello Amos,

Thank you for reaching out for help with integrating your function using Maple. It is important to note that Maple is a powerful tool for symbolic computation, but it may require some additional input from the user in order to provide a numerical result. Here are a few suggestions that may help you get the desired result:

1. Check your syntax: Make sure that all of the variables in your function are defined and that you are using the correct operators (+, -, *, /, etc.). One small error can cause Maple to return a symbolic answer instead of a numerical one.

2. Use the "evalf" command: As you mentioned, using the "evalf" command can help Maple to provide a numerical result. However, it is important to note that it may not always work depending on the complexity of your function.

3. Specify the value of your constant: In your function, you have a constant (c2) that is not defined. Maple may not be able to provide a numerical result if this constant is not specified. Try defining c2 with a numerical value and see if that helps.

4. Use the "numeric" command: If all else fails, you can try using the "numeric" command before evaluating your function. This will force Maple to use numerical methods to evaluate your function and may provide a result.

I hope these suggestions help you to get the desired result. Good luck with your integration!