Displaying 5 results from an estimated 5 matches for "rfun".
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2002 Jun 13
3
Bug in rnorm. (PR#1664)
...monstrate the bug.
cheers,
Rolf Turner
rolf@math.unb.ca
#==+===+===+===+===+===+===+===+===+===+===+===+===+===+===+===+===+===+===
#
# Script to demonstrate the bug in rnorm.
#
myrnorm <- function(n,mu=0,sigma=1){
mu + sigma*cos(2*pi*runif(n))*sqrt(-2*log(runif(n)))
}
# If RFUN <- rnorm we get ``wrong'' answers; if RFUN <- myrnorm,
# we get ``right'' answers.
RFUN <- rnorm
NSER <- 1000
set.seed(350734)
rslt <- list()
for(K in 1:15) {
N <- 100*K
M <- matrix(RFUN(NSER*N),N,NSER)
T2 <- apply(M,2,function(x){max(x**2)})
PV &...
2012 Jan 24
1
problems with rollapply {zoo}
...{ rv = 2*p[3]+6*p[4]*x+12*p[5]*x*x;rv;}
# evaluate the second derivative at the ith root, and print the result
r <- dd(pr[i])
r
}
rollRegFun(alpha,1)
rollRegFun(alpha,2)
rollRegFun(alpha,3)
The code I show above does not give an error, but if the function is
re-written as:
rFun <- function(d) {
d$rt <- seq(1-nrow(d),0)
polyfit <- lm(Close ~ poly(rt,4),d)
p <- coef(polyfit)
pr <- polyroot(c(p[2],2*p[3],3*p[4],4*p[5]))
dd <- function(x) { rv = 2*p[3]+6*p[4]*x+12*p[5]*x*x;rv;}
r <- dd(pr[1])
r
}
And I try to get rollapply to ex...
2005 Dec 23
2
convolution of the double exponential distribution
Is there any R function that computes the convolution of the double
exponential distribution?
If not, is there a good way to integrate ((q+x)^n)*exp(-2x) over x from
0 to Inf for any value of q and for any positive integer n? I need to
perform the integration within a function with q and n as arguments. The
function integrate() is giving me this message:
"evaluation of function gave a
2009 Jan 08
1
R and Excel
Even using the VBA back of Excel to create interfaces with R would
make a lot of sense. Suppose I could have access to VBA macros that
import and export data into R , it would be great.
The R GUI series like Rattle come even closer to Excel...so a VBA
_R_ExCel package might be useful to ordinary folks .
Besides Excel costs money, so adding R functions to Open Office would
help both of them ( if
2010 Mar 09
4
Scripts from The Elements of Statistical Learning book
Anyone know if it is possible to get the R scripts used in the "The Elements
of
Statistical Learning" book? It is a great book but sometimes some help would
be useful to replicate the results presented in the book and so, understood
things better.
Thanks
Manuel
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