Make a Sharkfin Function

A sharkfin function is built in steps:

1. take the product of two sigmoidal functions

   • the first one rises around day \(D\) with rate parameter \(uk\)

   • the second one decays around day \(D+L\) with rate \(-dk\)

2. the product is raised a power \(pw\)

3. the result is scaled so that the maximum is \(mx\) For the default values, the function looks like a shark fin.

# S3 method for class 'sharkfin'
make_function(opts)

Arguments

opts

a named list

Value

a function