General linear constraints don't seem to work. I get an error message if I
have more constraint equations than variables. E.g. executing the following
code
print(R.version)
library('tmvtnorm')
cat('tmvtnorm version ')
print(packageVersion('tmvtnorm'))
## Let's constrain our sample to the dwarfed hypercube of dimension p.
p <- 3 # dimension
mean <- rep(0,p)
sigma <- diag(p)
## a <= Dx <= b
a <- c(rep(0,p),-Inf)
b <- c(rep(1,p),2)
D <- rbind(diag(p),rep(1,p))
cat('mean is\n'); print(mean)
cat('a is\n'); print(a)
cat('b is\n'); print(b)
cat('D is\n'); print(D)
X <- rtmvnorm(n=1000, mean, sigma, D=D, lower=a, upper=b, algorithm="gibbsR")
produces the following output
platform x86_64-w64-mingw32
arch x86_64
os mingw32
system x86_64, mingw32
status
major 3
minor 1.0
year 2014
month 04
day 10
svn rev 65387
language R
version.string R version 3.1.0 (2014-04-10)
nickname Spring Dance
tmvtnorm version [1] '1.4.9'
mean is
[1] 0 0 0
a is
[1] 0 0 0 -Inf
b is
[1] 1 1 1 2
D is
[,1] [,2] [,3]
[1,] 1 0 0
[2,] 0 1 0
[3,] 0 0 1
[4,] 1 1 1
Error in checkTmvArgs(mean, sigma, lower, upper) (from rtmvnorm-test.R#18) :
mean, lower and upper must have the same length
That error message is not appropriate when a matrix of linear constraints is
passed in. I emailed the package maintainer on the 3rd but received only an
automatic out-of-office reply.
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
