rBAPtransition2.trapezoid: Draw (X[t],Y[t]) jointly from BAP transition density.
In michaelgordy/basicAffineProcess: Basic Affine Processes

Integral Y[t] obtained via simple trapezoid rule.

1 2	rBAPtransition2.trapezoid(X0, mu, kappa, sigma, lambda = 0, zeta = 1, horizon, ticks = 100)

`X0`	Initial condition X=X0
`mu`	Drift of process.
`kappa`	Mean reversion of process.
`sigma`	Volatility of process.
`lambda`	Jump arrival rate of process.
`zeta`	Mean of jump size distribution.
`horizon`	time t
`ticks=100`	is approximate number of knot points in [0,horizon]