During an SSA simulation, at any infinitesimal time interval, a reaction will occur with a probability defined according to its propensity. If it does, then it will change the state vector according to its effects.
reaction(propensity, effect, name = NA_character_)
It is possible to use 'buffer' values in order to speed up the computation
of the propensity functions. For instance, instead of
"(c3 * s1) / (1 + c3 * c1)",
it is possible to write
"buf = c3 * s1; buf / (buf + 1)" instead.
[SSA_reaction] This object describes a single reaction as part of an SSA simulation. It contains the following member values:
r[["propensity"]]: The propensity function as a character.
r[["effect"]]: The change in state caused by this reaction.
r[["name"]]: The name of the reaction,
NA_character_ if no name was provided.
# propensity effect reaction(~ c1 * s1, c(s1 = -1)) reaction("c2 * s1 * s1", c(s1 = -2, s2 = +1)) reaction("buf = c3 * s1; buf / (buf + 1)", c(s1 = +2))
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