joelpf@u.washington.edu
2005-Nov-25 21:38 UTC
[Rd] "integrate" error using a constant function (PR#8348)
Full_Name: Joel Franklin
Version: 2.2.0
OS: WinXP-Prof
Submission from: (NULL) (63.226.223.22)
The "integrate" function, when evaluating an integrand function that
is constant
(therefore not a function of the integral) cannot be valuated, and instead
throws an error. Instead, the interate function should evaluate the constant
function as a rectangular area with length (upper-lower).
For example:
integrand<-function(x){5}
integrate(f=integrand,lower=1,upper=5)
"Error in integrate(f = integrand, lower = 1, upper = 5) :
evaluation of function gave a result of wrong length"
Did you check the examples on the help page for integrate? integrand <- function(x) rep(5, length(x)) should do it. Definitely not a bug. Peter joelpf at u.washington.edu wrote:> Full_Name: Joel Franklin > Version: 2.2.0 > OS: WinXP-Prof > Submission from: (NULL) (63.226.223.22) > > > The "integrate" function, when evaluating an integrand function that is constant > (therefore not a function of the integral) cannot be valuated, and instead > throws an error. Instead, the interate function should evaluate the constant > function as a rectangular area with length (upper-lower). > > For example: > > integrand<-function(x){5} > integrate(f=integrand,lower=1,upper=5) > > "Error in integrate(f = integrand, lower = 1, upper = 5) : > evaluation of function gave a result of wrong length" > > ______________________________________________ > R-devel at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel-- Peter Ehlers Department of Mathematics and Statistics University of Calgary, 2500 University Dr. NW ph: 403-220-3936 Calgary, Alberta T2N 1N4, CANADA fax: 403-282-5150