search for: adaptintegr

I want to measure the error in the estimation of a 2 dimensional density function that is calculated using an integral but run into problems trying to integrate with adaptIntegrate because the integrand also calls the function adaptIntegrate. In particular I want \int \hat{f}(x,y) - f(x,y) dx dy where \hat{f}(x,y) = \int K(a,b, x, y) da db and in this simulation study I know what the true value of f(x,y) is. I can use adaptIntegrate to calculate \hat{f}(x1,y1) = adaptInt...

Hello, I am trying to use adaptIntegrate function but I need to pass on a few additional parameters to the integrand. However, this function seems not to have the flexibility of passing on such additional parameters. Am I missing something or this is a known limitation. Is there a good alternative to such restrictions, if there at all...

Hi all, it seems that there is problem with function "adaptIntegrate", when the integration limits is infinity. Please see the code below. The second integration does not seem to work. Can anyone familiar with this give some help? Thank you with much. Hanna library(mnormt) library(cubature) ff <- function(x, rho){ mu <- rep(...

...rate() only allows scalar integrands, thus I would need to call it many (p=200 typically) times, which sounds suboptimal. The cubature package seems well suited, as illustrated below, library(cubature) Nmax <- 1e3 tolerance <- 1e-4 integrand <- function(x, a=0.01) c(exp(-x^2/a^2), cos(x)) adaptIntegrate(integrand, -1, 1, tolerance, 2, max=Nmax)$integral [1] 0.01772454 1.68294197 However, adaptIntegrate appears to perform quite poorly when compared to integrate. Consider the following example (one-dimensional integrand), library(cubature) integrand <- function(x, a=0.01) exp(-x^2/a^2)*cos(x...

Hello Dear List members, as you can see (and guess) from the code below adaptIntegrate(f,lowerLimit=c(-1,-1),upperLimit=c(.9999,.9999)) $integral [1] 9.997e-09 $error [1] 1.665168e-16 $functionEvaluations [1] 17 $returnCode [1] 0 > adaptIntegrate(f,lowerLimit=c(-1,-1),upperLimit=c(1,1)) the last command runs for 45 mins now. -this one takes only less than sec: adaptInte...

Hi everyone, I have been using adaptIntegrate from the cubature package for a multidimensional integral that has infinite variance (and so not appropriate for Monte Carlo techniques). Most of the time it works but sometimes (though not always) when I slightly increase the accuracy I want, or increase the bounds of integration I get the foll...

Hi, I am using adaptIntegrate from Cubature to do numerical integration on a double integral with a 1 x 2 vector x. Say the function is something simple to start like f(x)=x1*x2 and I wish to integrate x1 over (0,365-x2) and x2 over (0,365) f <- function(x) {(x[2])*(x[1])} # "x" is vector int1<-adaptIntegra...

Dear list, I'm seeking some advice regarding a particular numerical integration I wish to perform. The integrand f takes two real arguments x and y and returns a vector of constant length N. The range of integration is [0, infty) for x and [a,b] (finite) for y. Since the integrand has values in R^N I did not find a built-in function to perform numerical quadrature, so I wrote my own after

...-1 for (i in 1:length(dose)) { psi0<-1/((1+exp(x[1]+x[2]*dose[i]))*(1+exp(x[3]+x[4]*dose[i]))) psi1<-exp(x[1]+x[2]*dose[i])/((1+exp(x[1]+x[2]*dose[i]))*(1+exp(x[3]+x[4]*dose[i]))) v<-v*(psi0^y0[i])*(psi1^y1[i])*((1-psi0-psi1)^y2[i]) } return(v) } adaptIntegrate(lf, lowerLimit = c(-20, 0,-20,0), upperLimit = c(0,10,0,10)) --------------------------------------------------------------------------------------------------------------------------------- Thanks for your attention. Kind regards, Jamil. [[alternative HTML version deleted]]

...e a function like: f(x1,x2)=2/3*(x1+x2) in the interval 0<x1<x2<7. To be sure I tried it by hand and got 114.33, but the following R code is giving me 102.6667. ------------------------------------------------------------------- library(cubature) f<-function(x) { 2/3 * (x[1] + x[2] ) } adaptIntegrate(f, lowerLimit = c(0, 0), upperLimit = c(x[2],7)) ------------------------------------------------------------------- I guess something is wrong with the way I have assigned limits in my codes. May I seek some advice from you. Many thanks. Regards, Jamil. [[alternative HTML version deleted...

Hi All, I get the message failed with message ‘Dimension out of range’ when using cuhre in package R2Cuba. Does anyone know what this mean? Or would I need to email the package author? The funny thing is it does give a result and comparing it to "adaptIntegrate" in package cubature, the two numbers are very close. Thanks, Sachin [[alternative HTML version deleted]]

...x1 <- x[1] + x2 <- x[2] + Sigma <- matrix(c(1, rho, rho, 1), 2,2) + mu <- rep(0,2) + f <- pmnorm(c((z-a*x1)/b, (z-a*x2)/b), mu, Sigma)*dmnorm(c(0,0), mu, diag(2)) + f + } > > adaptIntegrate(integrand, lower=rep(-Inf, 2), upper=c(2,2), + rho=0.1, a=0.6, b=0.3, z=3, maxEval=10000) Error in if (any(lower > upper)) stop("lower>upper integration limits") : missing value where TRUE/FALSE needed [[alternative HTML version deleted]]

hello I work on the probabilities of bivariate normal distribution. I need integrate  the following function. f (x, y) = exp [- (x ^ 2 + y ^ 2 + x * y)] with - ∞ ≤ x ≤ 7.44 and - ∞ ≤ y ≤ 1.44   , either software R or  matlab Version R 2009a Thank you for helping me Regards Mezouara hicham PhD in Metrology Hicham_dess @ yahoo.fr [[alternative HTML version deleted]]

Dear R-users, I'm wondering how to calculate this double integral in R: int_a^b int_c^y g(x, y) dx dy where g(x,y) = exp(- alpha (y - x)) * b Thanks for answering! Cheers, Alui [[alternative HTML version deleted]]

...ld like to take a (numerical) integration of a function f(x,y) which can be quite complex of x and y, over a disk (x-a)^2+(y-b)^2<= r^2 (with r constant). However, after some search in R, I just cannot find a function in R that suits my purpose. Function Integrate applies to one dimensional, and adaptIntegrate to rectangle. In my case, it is not easy or simply impossible to transform the definition area to a rectangle with constant boundaries.   I must have missed something, but is there any R function which can solve the integration without going to ex. Monto Carlo? Many thanks in advance!   Best reg...

Dear all, two days ago I was trying to run a bunch of adaptIntegrate() functions (double integrals) into my 4 core pc. As I was not satisfied about my pc's performance I tried also to run my code to another computer that has 8 or 16 cores. Unfortunately I didnt get any really decent improvement . In both computer only the first core was looking busy while t...

Hi All, I'm trying to use one of the (2D) numerical integration functions, which is not where the problem is. The function definition is as follows: adaptIntegrate(f, lowerLimit, upperLimit, ...) The problem is that I want to integrate a 3D function which has been parametrised such that it is a 2D function: eg. I want to integrate f(x_start+gradient_x*t1, y_start+gradient_y*t2) for t1 in [0,1] and t2 in [0,1]. To explain the example in another way I only...

Dear R helpers I am working on the Bi-variate Normal distribution probabilities. I need to double integrate the following function (actually simplified form of bivariate normal distribution) f(x, y) = exp [ - 0.549451 * (x^2 + y^2 - 0.6 * x * y) ] where 2.696 < x < 3.54 and -1.51 < y < 1.98 I need to solve something like INTEGRATE (2.696 to 3.54) dx INTEGRATE [(-1.51 to 1.98)]

Hi folks, I am having a question about efficiently finding the integrals of a list of functions. To be specific, here is a simple example showing my question. Suppose we have a function f defined by f<-function(x,y,z) c(x,y^2,z^3) Thus, f is actually corresponding to three uni-dimensional functions f_1(x)=x, f_2(y)=y^2 and f_3(z)=z^3. What I am looking for are the integrals of these three