minus_mfd: Subtract multivariate functional data (and unary negation)

In funcharts: Functional Control Charts

Subtract multivariate functional data (and unary negation)

Description

Subtracts two objects of class mfd (elementwise on their coefficient arrays). The same basis, variable-count, and observation-replication rules as in plus_mfd apply. If mfdobj2 is missing, returns the unary negation of mfdobj1.

Usage

minus_mfd(mfdobj1, mfdobj2)

## S3 method for class 'mfd'
mfdobj1 - mfdobj2

Arguments

mfdobj1, mfdobj2

Objects of class mfd. If mfdobj2 is missing, unary minus is applied to mfdobj1.

Value

An object of class mfd with coefficients equal to the (possibly replicated) difference mfdobj1 - mfdobj2, or the negation of mfdobj1 for unary minus.

See Also

plus_mfd, nobs, nbasis, nvar, mfd

Examples

# mfdobj_a - mfdobj_b
# minus_mfd(mfdobj_a, mfdobj_b)
# Unary minus:
# -mfdobj_a

funcharts documentation built on Dec. 12, 2025, 5:06 p.m.