scalePar {PBSmodelling}

Scale Parameters to [0,1]

Description

Scale parameters for function minimization by calcMin.

Usage

scalePar(pvec)

Arguments

pvec

a data frame comprising four columns - c("val","min","max","active") and as many rows as there are model parameters. The "active" field (logical) determines whether the parameters are estimated (TRUE) or remain fixed (FALSE).

Details

Scaling algorithm: S = \frac{2}{\pi} asin \sqrt{ \frac{P - P_{min}}{P_{max} - P_{min}} }

Value

Parameter vector scaled between 0 and 1.

Author(s)

Jon T. Schnute, Pacific Biological Station, Fisheries and Oceans Canada, Nanaimo BC

See Also

restorePar, calcMin, GT0

Examples

local(envir=.PBSmodEnv,expr={
  pvec <- data.frame(val=c(1,100,10000),min=c(0,0,0),max=c(5,500,50000),
    active=c(TRUE,TRUE,TRUE))
  S    <- scalePar(pvec)
  print(cbind(pvec,S))
})