
On Dec 4, 2011, at 9:52 AM, e eeyore wrote:

> This is not homework, I calculate some expectations and to finish  
> that I must solve integral like this one..
> Upper bound have some unknown parameter, but I dont know how to  
> write it in R.

You almost did write it in R. You just left the "m" unspecified. If  
you replace "m" by 5 the code works.
>
> Do I must define m like symbol, or something else, just need help  
> with that.
> I know how this work in MatLab, but in R I have problem.
> Is there any solution how to solve integral like this one?
>
> Can you help me please little more or direct me to right way, I will  
> appreciate your effort.
>
> Thanks
>
>
> On Sun, Dec 4, 2011 at 6:06 AM, David Winsemius <dwinsemius@comcast.net 
> > wrote:
>
> On Dec 3, 2011, at 10:23 PM, grttt nbbfg wrote:
>
> Sorry for my English, is not my first language..
>
> I have some trouble in terms of using integrate function in R.
> fx is a function of m and x where m is supposed to be a unknown  
> parameter.
>
> R is not an algebraic solver (and R-help is not a homework list.).
>
>
>
> fx=function(m,x){
> + x*2/(3*m)*(1-x/(3*m))
> + }
>
> The problem is in upper bound, it depends on parameter m.
>
> integrate(fx,lower=0,upper=3*m)$value
>
> Is it possible to use the integrate function when bounds depend on a
> parameter?
>
> If it is known, yes. You could also do some investigation:
>
> curve(x*2/(3*5)*(1-x/(3*5)), 0, 15)
>
>
>
> How to define m to solve this integral? The result should be m.
>
> As I said, no homework answers here.
>

David Winsemius, MD
West Hartford, CT


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