A dirac delta on "non_dec", to provide a constant non-decision time.
nt_constant(prms_model, prms_solve, t_vec, one_cond, ddm_opts)a vector of the same length as t_vec with zeros, except for the element matching with "non_dec" with respect to "t_vec"
the model parameters; containing "non_dec"
solver settings
time space
one condition
optional arguments attached to an object