-.funts: Subtract `funts` Objects or a `funts` Object and a Scalar
Description
This function allows subtraction between two `funts` (functional time series) objects or
between a `funts` object and a scalar. It returns the resulting difference.
Usage
# S3 method for funts
-(obj1, obj2 = NULL)
Arguments
obj1
an object of class `funts`, representing the first `funts` object.