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Andreas Wittmann andreas_wittm...@gmx.de
Sent by: r-help-boun...@r-project.org
04/22/2009 03:28 AM
To
r-help@r-project.org
cc
Subject
[R] integrate lgamma from 0 to Inf
On Wed, Apr 22, 2009 at 3:28 AM, Andreas Wittmann
andreas_wittm...@gmx.de wrote:
i try to integrate lgamma from 0 to Inf.
Both gamma and log are positive and monotonically increasing for large
arguments.
What can you conclude about the integrability of log(gamma(x))?
-s
14203-1016
Office: 716-887-6807
Fax: 716-887-2510
http://www.ria.buffalo.edu/profiles/lucke.html
Stavros Macrakis macra...@alum.mit.edu
Sent by: r-help-boun...@r-project.org
04/27/2009 10:30 AM
To
Andreas Wittmann andreas_wittm...@gmx.de
cc
r-help@r-project.org
Subject
Re: [R] integrate
Dear R users,
i try to integrate lgamma from 0 to Inf. But here i get the message roundoff
error is detected in the extrapolation table, if i use 1.0e120 instead of Inf
the computation works, but this is against the suggestion of integrates help
information to use Inf explicitly. Using
If these messages you're hearing are warnings, then the answer might be:
?warnings
--
David Winsemius
On Dec 22, 2008, at 6:07 PM, glenn roberts wrote:
Quick One if any one can help please.
On use of integration function ‘integrate’; how do I get the
function to
return just the value
.. but it turned out he wanted;
integrate(integrand)$value
--
David Winsemius
On Dec 22, 2008, at 6:26 PM, David Winsemius wrote:
If these messages you're hearing are warnings, then the answer might
be:
?warnings
-- David Winsemius
On Dec 22, 2008, at 6:07 PM, glenn roberts wrote:
i'm in the process of switch from Maple to R and am trying to code the
following function:
w(d)=\int -Inf_Inf A(x) |int 0_(t(d)-x) Fy dydx
can some one point me in the right direction? i don't seem to be able to
figure it out on my own.
Dr. Wade Winterhalter
University of Central Florida
I'm trying to integrate one dimension of a bivariate normal. It works
when additional parameters are passed explicitly:
library(mvtnorm)
bivInt - function(x,y,mx,my,r) { dmvnorm(c(x, y), mean=c(mx, my),
sigma=rbind(c(1, r), c(r, 1))) }
integrate(Vectorize(bivInt), lower=-Inf, upper=2, 1, 2, 2,
; [EMAIL PROTECTED]
Subject: Re: [R] Integrate a 1-variable function with 1 parameter (Jose
L.Romero)
This can be done analytically: after changing a variable (2*t - t) and some
scaling we need to compute
f(x) = integral from 0 to 20 of (t^x*exp(-t))dt/factorial(x)
f(0) = int from 0 to 20 of exp(-t)dt
Hey fellas:
I would like to integrate the following function:
integrand - function (x,t) {
exp(-2*t)*(2*t)^x/(10*factorial(x))
}
with respect to the t variable, from 0 to 10.
The variable x here works as a parameter: I would like to integrate the said
function for each value of x in
jose romero wrote:
Hey fellas:
I would like to integrate the following function:
integrand - function (x,t) {
exp(-2*t)*(2*t)^x/(10*factorial(x))
}
with respect to the t variable, from 0 to 10.
The variable x here works as a parameter: I would like to integrate the said
function
Subject: [R] Integrate a 1-variable function with 1 parameter (Jose L.
Romero)
Hey fellas:
I would like to integrate the following function:
integrand - function (x,t) {
exp(-2*t)*(2*t)^x/(10*factorial(x))
}
with respect to the t variable, from 0 to 10.
The variable x here works as a parameter
Peter Dalgaard wrote:
jose romero wrote:
Hey fellas:
I would like to integrate the following function:
integrand - function (x,t) {
exp(-2*t)*(2*t)^x/(10*factorial(x))
}
with respect to the t variable, from 0 to 10.
The variable x here works as a parameter: I would like to
PROTECTED]
Subject: RE: [R] Integrate a 1-variable function with 1 parameter (Jose L.
Romero)
To: [EMAIL PROTECTED], r-help@r-project.org
Date: Wednesday, August 27, 2008, 2:42 PM
Here is one way:
integrand - function (t, x) {
exp(-2*t)*(2*t)^x/(10*factorial(x))
}
x - 0:44
ans
/factorial(x) + f(x-1) so that
f(x) = 1 - exp(-20)*sum(20^k/factorial(k)) where the sum is for k=0,1,...,x
If I did not a mistake, your original quantity should be f(x)/20.
--- On Thu, 28/8/08, jose romero [EMAIL PROTECTED] wrote:
From: jose romero [EMAIL PROTECTED]
Subject: [R] Integrate a 1
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