declare_step {DeclareDesign}

Declare a custom step

Description

With declare_step, you can include any function that takes data as one of its arguments and returns data in a design declaration. The first argument is always a "handler", which is the name of the data-in, data-out function. For handy data manipulations use declare_step(fabricate, ...).

Usage

declare_step(
  ...,
  handler = function(data, ...f, ...) ...f(data, ...),
  label = NULL
)

Arguments

...

arguments to be captured, and later passed to the handler

handler

a tidy-in, tidy-out function

label

a string describing the step

Value

A function that returns a data.frame.

Examples

population <- declare_model(N = 5, noise = rnorm(N))
manipulate <- declare_step(fabricate, noise_squared = noise^2, zero = 0)

design <- population + manipulate
draw_data(design)