tf_approx_linear {tf}

Inter- and extrapolation functions for tfd-objects

Description

These are the currently available evaluator-functions for tfd-objects, which control how the entries are inter-/extrapolated to previously unseen arg-values. They all are merely wrappers around zoo::na.fill(), zoo::na.approx(), etc... Note that these are not meant to be called directly – they are internal functions used by tf_evaluate.tfd() to do its thing.

The list:

• tf_approx_linear for linear interpolation without extrapolation (i.e., zoo::na.approx() with na.rm = FALSE) – this is the default,

• tf_approx_spline for cubic spline interpolation, (i.e., zoo::na.spline() with na.rm = FALSE),

• tf_approx_none in order to not inter-/extrapolate ever (i.e., zoo::na.fill() with fill = NA)

• tf_approx_fill_extend for linear interpolation and constant extrapolation (i.e., zoo::na.fill() with fill = "extend")

• tf_approx_locf for "last observation carried forward" (i.e., zoo::na.locf() with na.rm = FALSE and

• tf_approx_nocb for "next observation carried backward" (i.e., zoo::na.locf() with ⁠na.rm = FALSE, fromLast = TRUE⁠).

For implementing your own, see source code of tf:::zoo_wrapper.

Usage

tf_approx_linear(x, arg, evaluations)

tf_approx_spline(x, arg, evaluations)

tf_approx_none(x, arg, evaluations)

tf_approx_fill_extend(x, arg, evaluations)

tf_approx_locf(x, arg, evaluations)

tf_approx_nocb(x, arg, evaluations)

Arguments

x

new arg values to approximate/interpolate/extrapolate the function for

arg

the arg values of the evaluations

evaluations

the function values at arg

Value

a vector of values of the function defined by the given (x_i, f(x_i))=⁠(arg, evaluations)⁠-tuples at new argument values x.

See Also

tfd

Other tidyfun inter/extrapolation functions: tf_evaluate(), tf_interpolate()

Other tidyfun inter/extrapolation functions: tf_evaluate(), tf_interpolate()

Other tidyfun inter/extrapolation functions: tf_evaluate(), tf_interpolate()

Other tidyfun inter/extrapolation functions: tf_evaluate(), tf_interpolate()

Other tidyfun inter/extrapolation functions: tf_evaluate(), tf_interpolate()

Other tidyfun inter/extrapolation functions: tf_evaluate(), tf_interpolate()