Functions to zoom in/out on functions

These are used to redefine or restrict the domain of tf objects.

Usage

tf_zoom(f, begin, end, ...)

# S3 method for tfd
tf_zoom(f, begin = tf_domain(f)[1], end = tf_domain(f)[2], ...)

# S3 method for tfb
tf_zoom(f, begin = tf_domain(f)[1], end = tf_domain(f)[2], ...)

# S3 method for tfb_fpc
tf_zoom(f, begin = tf_domain(f)[1], end = tf_domain(f)[2], ...)

Arguments

f

a tf-object

begin

numeric vector of length 1 or length(f). Defaults to the lower limit of the domain of f.

end

numeric vector of length 1 or length(f). Defaults to the upper limit of the domain of f.

...

not used

Value

an object like f on a new domain (potentially). Note that regular functional data and functions in basis representation will be turned into irregular tfd-objects iff begin or end are not scalar.

See also

Other tidyfun utility functions: in_range(), tf_arg()

Examples

x <- tf_rgp(10)
plot(x)
tf_zoom(x, 0.5, 0.9)
#> tfd[10] on (0.5,0.9) based on 21 evaluations each
#> interpolation by tf_approx_linear 
#> 1: (0.50,-0.062);(0.52,-0.141);(0.54,-0.226); ...
#> 2: (0.50,  0.53);(0.52,  0.53);(0.54,  0.51); ...
#> 3: (0.50, -0.50);(0.52, -0.54);(0.54, -0.58); ...
#> 4: (0.50, -0.26);(0.52, -0.22);(0.54, -0.25); ...
#> 5: (0.50, -0.70);(0.52, -0.70);(0.54, -0.67); ...
#>     [....]   (5 not shown)
tf_zoom(x, 0.5, 0.9) |> lines(col = "red")
tf_zoom(x, seq(0, 0.5, length.out = 10), seq(0.5, 1, length.out = 10)) |>
  lines(col = "blue", lty = 3)