tf_integrate {tf}

Integrals and anti-derivatives of functional data

Description

Integrals of tf-objects are computed by simple quadrature (trapezoid rule). By default the scalar definite integral \int^{upper}_{lower}f(s)ds is returned (option definite = TRUE), alternatively for definite = FALSE the anti-derivative on ⁠[lower, upper]⁠, e.g. a tfd or tfb object representing F(t) \approx \int^{t}_{lower}f(s)ds, for t \in⁠[lower, upper]⁠, is returned.

Usage

tf_integrate(f, arg, lower, upper, ...)

## Default S3 method:
tf_integrate(f, arg, lower, upper, ...)

## S3 method for class 'tfd'
tf_integrate(
  f,
  arg,
  lower = tf_domain(f)[1],
  upper = tf_domain(f)[2],
  definite = TRUE,
  ...
)

## S3 method for class 'tfb'
tf_integrate(
  f,
  arg,
  lower = tf_domain(f)[1],
  upper = tf_domain(f)[2],
  definite = TRUE,
  ...
)

Arguments

f

a tf-object

arg

(optional) grid to use for the quadrature.

lower

lower limits of the integration range. For definite=TRUE, this can be a vector of the same length as f.

upper

upper limits of the integration range (but see definite arg / Description). For definite=TRUE, this can be a vector of the same length as f.

...

not used

definite

should the definite integral be returned (default) or the antiderivative. See Description.

Value

For definite = TRUE, the definite integrals of the functions in f. For definite = FALSE and tf-inputs, a tf object containing their anti-derivatives

See Also

Other tidyfun calculus functions: tf_derive()