Description Usage Arguments Details Value References See Also Examples
Random number generation from the multivariate Student-t distribution.
1 2 |
n |
the number of samples requested |
center |
a vector giving the locations of each variable |
Scatter |
a positive-definite dispersion matrix |
df |
degrees of freedom (positive, maybe non-integer) |
The function rmt
is an interface to C routines, which make calls to
subroutines from LAPACK. The matrix decomposition is internally done using
the Cholesky decomposition. If Scatter
is not non-negative definite then
there will be a warning message.
If n = 1
a vector of the same length as center
, otherwise a
matrix of n
rows of random vectors.
Devroye, L. (1986). Non-Uniform Random Variate Generation. Springer-Verlag, New York.
1 2 3 4 5 6 7 8 9 10 11 12 | # dispersion parameters
Scatter <- matrix(c(10,3,3,2), ncol = 2)
Scatter
# generate the sample
y <- rmt(n = 1000, Scatter = Scatter)
# scatterplot of a random bivariate Student-t sample with center
# vector zero and scale matrix 'Scatter'
par(pty = "s")
plot(y, xlab = "", ylab = "")
title("bivariate Student-t sample (df = 4)", font.main = 1)
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