Compute the theoretical autocorrelation function for an ARMA process.
ARMAacf_cpp(ar,ma,lag_max)
x A matrix
listing values from 1...nx in one column and 1...1, 2...2,....,n...n, in the other
A vector
of length p containing AR coefficients
A vector
of length q containing MA coefficients
A unsigned integer
indicating the maximum lag necessary
JJB
This is an implementaiton of the ARMAacf function in R. It is approximately 40x times faster. The benchmark was done on iMac Late 2013 using vecLib as the BLAS.