plot_stream: Plot history of belief states

In conservation-decisions/smsPOMDP: POMDP problem solver: When to stop managing or surveying cryptic threatened species ?

Description

Plots succession of actions, observations and belief states given the list of past actions and observations

Usage

plot_stream(p0, pm, d0, dm, ds, V, Cm, Cs, state_prior,
            actions, observations, disc = 0.95, size = 1)

Arguments

p0	Local probability of persitance : P(extant/extant, survey or stop).
pm	Local probability of persitance if manage : P(extant/extant, manage).
d0	Local probability of detection : P(present/extant, stop).
dm	Local probability of detection : P(present/extant, manage).
ds	Local probability of detection if survey : P(present/extant, survey).
V	Estimated economic value of the species ($/yr).
Cm	Estimated cost of managing ($/yr).
Cs	Estimated cost of survey ($/yr).
state_prior	Initial belief state, vector of 2 values (belief state extant and extinct), between 0 and 1.
actions	List of past actions. Values in c('Manage','Survey','Stop'). Has to have the same length as obs.
observations	List of past observations. Values in c('Seen','Not_seen'). Has to have the same length as act.
disc	Discount factor used to compute the policy (default 0.95)
size	Size of the text on the graph (default 1)

Value

Plot.

Author(s)

Luz Pascal

Examples

## Not run: 
#values for Sumatran tigers
pen <- 0.1
p0 <- 1-pen
pem <- 0.05816
pm <- 1 - pem
V <- 175.133
Cm <- 18.784
Cs <- 10.840
d0 <- 0.01
dm <- 0.01
ds <- 0.78193

state_prior <- c(1,0)
actions <- c('Manage', 'Manage', 'Survey','Stop')
observations <- c('Not_seen','Not_seen','Not_seen','Seen')
plot_stream(p0, pm, d0, dm, ds, V, Cm, Cs, state_prior,
actions, observations, disc = 0.95, size = 1)

## End(Not run)

conservation-decisions/smsPOMDP documentation built on Oct. 27, 2020, 10:44 p.m.