startingPoint2tanchor function

Convert FiSAT's starting point to t_anchor value

Starting points returned or chosen within FiSAT are not supported in TropFishR. Instead t_anchor takes on the job of anchoring VBGF growth curves on a temporal axis. This function allows to convert FiSAT's starting points to t_anchor values

startingPoint2tanchor(param, par, startingLength, startingSample)

Arguments

• param: list with dates, midLengths, and catch
• par: list with growth parameters 'Linf' and 'K' of VBGF
• startingLength: starting length as returned by FiSAT, indicating the length within the starting sample cut by a growth curve
• startingSample: starting sample as returned by FiSAT, indicating the sample which is cut by a growth curve

Returns

list with input elements and estimated t_anchor value

Examples

data(synLFQ5)
lfqNEW <- startingPoint2tanchor(synLFQ5, par = list(Linf = 92, K = 0.37),
   startingLength = 31, startingSample = 4)
lfqRest <- lfqRestructure(lfqNEW, MA = 11)
plot(lfqRest,par=list(Linf=lfqRest$Linf,K=lfqRest$K,t_anchor=lfqRest$t_anchor))