Default derivative method for HRF objects

Uses numerical differentiation via numDeriv::grad when analytic derivatives are not available for a specific HRF type.

Usage

# S3 method for class 'HRF'
deriv(x, t, ...)

Arguments

x

An HRF object

t

Numeric vector of time points at which to evaluate the derivative

...

Additional arguments (currently unused)

Value

Numeric vector or matrix of derivative values