bmass-class {FLEDA} | R Documentation |
This class encapsulates results of a mature (mb
) and immature (ib
) biomass method.
Objects of this classe should be created with a call to the creator function bmass(object, ...)
, where object
must be of class "FLStock"
and ...
can be used to pass trim
arguments to the creator funtion.
"FLQuants"
with a mb
component and a ib
component.
Class "FLQuants"
, directly.
Inherits from "FLQuants"
.
Considering C_{ay}, the catch in numbers, W_{ay}, the mean weight and M_{ay}, the proportion of mature fish, at age a=1,...,A and year y=1,...,Y obtained e.g. from a "FLStock"
object, the computations of bmass
are:
mb
:
MB_{y}=sum_{a}{C_{ay}*W_{ay}*M_{ay}}
ib
:
IB_{y}=sum_{a}{C_{ay}*W_{ay}*(1-M_{ay})}
FLQuant-class
, trim
, logr-class
data(ple4) # compute mature and immature biomass ple4.bmass <- bmass(ple4) # tune plot ttl <- list(label="Trends in biomass for mature and immature plaice in IV", cex=1) yttl <- list(label="relative biomass", cex=0.8) xttl <- list(cex=0.8) ax <- list(cex=0.8) akey <- simpleKey(text=c("mature", "immature"), points=FALSE, lines=TRUE) # plot xyplot(data~year, data=ple4.bmass, type="l", main=ttl, key=akey, ylab=yttl, xlab=xttl, scales=ax)