[R] integral depending on a parameter

[Rolf Turner]

On 06/08/11 08:17, brunero liseo wrote:
> Is it possible to use the "integrate" function when it depends on a
> parameter?
> in other words can i get something like
>
> f(y) = integrate (g(x,y))?
> If not, how else can I get that?
> thanks in advance

This really boils down to ``RTFM''.

The help for "integrate" ``clearly'' ( :-) ) states that there is a 
"..." argument
which consists of ``additional arguments passed to f''.  So use it.

E.g.:

     foo <- function(x,y){sin(x^2 + y^2)}
     integrate(foo,0,2*pi,y=pi/4)
     0.9314315 with absolute error < 1.5e-05

Most of the time, what you need to know is in the help.  You just need
to learn to read the help *carefully* and think along the lines:  ``This
*does* mean something useful and is actually expressed in a rational
albeit it cryptic manner.  Given that fact, what could this *possibly* 
mean?''
That will usually get you there.   Then *try* what you think you gleaned
from the help using a *simple* example.

     cheers,

         Rolf Turner