Generates pseudo-random numbers from a symmetric triangular distribution.
rtri(n, r)number of random variables to generate.
concentration parameter of the distribution. r must be between 0 and \(4/pi^2\).
Returns a vector of n independent random variables generated from a symmetric triangular distribution with mean direction 0 and concentration parameter r.
The triangular cdf is inverted to obtain the random numbers.
Jammalamadaka, S. Rao and SenGupta, A. (2001). Topics in Circular Statistics, Section 2.3.3, World Scientific Press, Singapore.