[R] integrate and quadratic forms
rdporto1
rdporto1 at terra.com.br
Fri Jan 19 17:30:47 CET 2007
Thanks Jim. But a narrower problem still remains.
Please, look at this new code:
lambda=c(.6,.3)
integral = function(u) {
theta = (atan(.6*u) + atan(.3*u))/2 - .1*u/2
rho = (1+.6^2*u^2)^(1/4) * (1+.3^2*u^2)^(1/4)
integrand = sin(theta)/(u*rho)
}
> integrate(integral,0,Inf)$value
[1] 1.222688
If I replace
theta = sum(atan(lambda*u))/2 - .1*u/2
I get
> integrate(integral,0,Inf)$value
[1] 1.517134
It seems there is a problem between the sum() and integrate()
functions.
Is there a way to solve this problem?
Thanks in advance.
Rogerio.
---------- Part of the Original Message -----------
> They do give the same answer, unfortunately the examples you sent were not
> the same. Integral2 was missing a 'sin'. So I would assume there might be
> something else wrong with your functions. You might want to try breaking it
> down into smaller steps so you can see what you are doing. It definitely is
> hard to read in both cases.
>
> Jim Holtman
> Cincinnati, OH
> +1 513 646 9390
>
> What is the problem you are trying to solve?
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