Return a seasonal pattern \(S(t)\), a function of the form $$S(t) = c \left(1+\epsilon + \sin\left(\frac{2 \pi (t-\tau)}{365}\right)\right)^p$$ where \(c\) is a normalizing constant, and
\(\epsilon \geq 0\) or
floor\(\tau\) or
phase\(p\) or
pw
The algorithm sets the constant \(c\) or norm
such that $$\int_0^{365} S(t) dt=c$$ where the default is norm=365.
Usage
# S3 method for class 'sin'
make_function(opts)