Hi,
I think you want to Vectorize integrate(), not integrand(). Here's a
way using mapply,
integrand <- function(z)
{
return(z * z)
}
vec1<-1:3
vec2<-2:4
mapply(integrate, lower=vec1, upper=vec2, MoreArgs=list(f=integrand) )
baptiste
On 20 Sep 2008, at 13:08, Andreas Wittmann wrote:
Dear R useRs,
i try to integrate the following function for many values
"integrand" <- function(z)
{
return(z * z)
}
i do this with a for-loop
for(i in 2:4)
{
z <- integrate(integrand, i-1, i)$value
cat("z", z, "\n")
}
to speed up the computation for many values i tried vectors
in integrate to do this.
vec1<-1:3
vec2<-2:4
integrate(Vectorize(integrand), vec1, vec2)$value
but here it seems the integration works only for the first values of
vec1 and vec2.
If you have any advice how i can to this computations with vectors
or something like that, i would be very thankful,
best regards
Andreas
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_____________________________
Baptiste Auguié
School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK
Phone: +44 1392 264187
http://newton.ex.ac.uk/research/emag
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
