Type of Twalk move. Either "walk", "traverse", "hop" or "blow"
Npar
number of parameters
pn1
Probability determining the number of parameters that are changed.
x
parameter vector of chain 1
x2
parameter vector of chain 2
beta
parameter for "traverse" move proposals.
aw
"walk" move proposal parameter.
References
Christen, J. Andres, and Colin Fox. "A general purpose sampling algorithm for continuous distributions (the t-walk)." Bayesian Analysis 5.2 (2010): 263-281.