TropFishR (version 1.6.1)

plot.predict_mod: Plotting prediction models yield per recruit and Thompson & Bell

Description

This function plots objects of the class "predict_mod", which are results of the function predict_mod.

Usage

# S3 method for predict_mod
plot(x, type = "ypr", xaxis1 = "FM",
  yaxis1 = "Y_R.rel", yaxis2 = "B_R.rel", yaxis_iso = "Lc",
  identify = FALSE, mark = FALSE, contour = TRUE, xlab = NA,
  ylab1 = NA, ylab2 = NA, ylab3 = NA, ...)

Arguments

x

a object of the class 'predict_mod'

type

a character indicating, which type of plot should be displayed in case of Beverton and Holt's yield per recurit model. Options are either "ypr" (default) for line plot or "Isopleth" for isopleth plot.

xaxis1

which x-axis should be plotted? Either "FM" (fishing mortality; default) or "E" (exploitation rate).

yaxis1

which (first) y-axis should be plotted? "Y_R" (yield per recruit; default) or "Y_R.rel" (relative yield per recruit) for type = "ypr". For "Isopleth" in addition: "B_R" (biomass per recruit) and "B_R.rel" (relative yield per recruit). For Thompson and Bell model in addition also "value" or "catch" possible.

yaxis2

which second y-axis should be plotted for type = "ypr"? Either "B_R" (biomass per recruit; default), "B_R.rel" (relative biomass per recruit), or "B_R.percent" (percentage biomass per recruit)

yaxis_iso

determines label and scale of y axis of Isopleth graph. Either "Lc" (default) for length at first capture or "Lc/Linf" for the relation of length at first capture to the infinite length

identify

logical; indicating whether points in the graph are supposed to be identified by clicking on them (uses locator function). To stop press right mouse click. (default: TRUE).

mark

logical; if value of choosen points should be displayed in graph (default: TRUE)

contour

used in combination with the Isopleth graph. Usage can be logical (e.g. TRUE) or providing a numeric which indicates the number of levels (nlevels in contour). By default TRUE.

xlab

Label of x-axis. If set to NA, then default "Fishing mortality", or "Exploitation rate" is used.

ylab1

Label of y-axis. If set to NA, then default "Yield" is used for the Thompson and Bell model, "Lc" is used for the Isopleth graph, and "Y/R" is used for ypr.

ylab2

Label of second y-axis. If set to NA, then default "Biomass" is used for the Thompson and Bell model and "B/R" for ypr.

ylab3

Label of third y-axis. If set to NA, then default "Value" is used for the Thompson and Bell model.

...

optional parameters of plot function

References

Sparre, P., Venema, S.C., 1998. Introduction to tropical fish stock assessment. Part 1. Manual. FAO Fisheries Technical Paper, (306.1, Rev. 2). 407 p.

Examples

# NOT RUN {
# Nemipterus marginatus - age structured data
threadfin <- list(Winf = 286,K = 0.37, t0 = -0.2, M = 1.1, tr = 0.4)

output <- predict_mod(threadfin, FM_change = seq(0,6,0.1),
   tc_change = seq(0.2,1,0.2), type = 'ypr')  #where it is maximal  = MSY
plot(output)

# hake - length structured data
data(hake)
hake$Lr <- 35
select.list <- list(selecType = 'trawl_ogive', L50 = 20, L75 = 24)
output <- predict_mod(param = hake, FM_change = seq(0,0.4,0.05),
                      curr.E = 0.4, curr.Lc = 40,
                      Lc_change = seq(5,80,1), s_list = select.list,
                      type = 'ypr', plot = FALSE)
plot(output, type = "Isopleth", xaxis1 = "FM", yaxis1 = "Y_R.rel",
   identify = FALSE)

# }