The method simulate launches LibBi to simulate a model by
passing `target="joint"` to LibBi
If x is given as a 'bi_model', a libbi object will be
created from the model
Usage
# S3 method for class 'libbi'
simulate(x, ...)
# S3 method for class 'bi_model'
simulate(x, ...)Value
an updated bi_model object