ar1_sim_conditional_cpp: Simulate from a stationary Gaussian AR(1) process.
In BenjaK/irregulAR1: Functions for Irregularly Sampled AR(1) Processes

Simulate from a stationary Gaussian AR(1) process at n consecutive time points.

1 2	ar1_sim_conditional_cpp(pred_times, mu_pred, x_obs, obs_times, mu_obs, rho, sigma)

`pred_times`	A vector of time points to simulate at.
`x_obs`	The observed values of the process.
`obs_times`	A vector of time points at which observations have been made.
`rho`	A real number strictly less than 1 in absolute value.
`sigma`	A positive real number.