# Pipe-friendly Arithmetic Helpers in doBy

## Søren Højsgaard

The doBy package includes a suite of simple, pipe-friendly arithmetic helper functions that make common transformations clearer and more expressive when using the native R pipe (`|>`).

These helpers let you write transformations in readable pipelines without nested or hard-to-read expressions. All functions are vectorized and work with scalars or numeric vectors.

## Available functions

- `add()`: add a constant
- `subtract()`: subtract a constant
- `mult()`: multiply by a constant
- `divide()`: divide by a constant
- `reciprocal()`: compute 1/x
- `pow()`: raise to a power

## Load doBy

    library(doBy)
    x <- c(1, 2, 3)

    # Addition
    x |> add(5)
    # [1] 6 7 8

    # Subtraction
    x |> subtract(1)
    # [1] 0 1 2

    # Multiplication
    x |> mult(10)
    # [1] 10 20 30

    # Division
    x |> divide(2)
    # [1] 0.5 1.0 1.5

    # Reciprocal
    x |> reciprocal()
    # [1] 1.0000000 0.5000000 0.3333333

    # Power
    x |> pow(2)
    # [1] 1 4 9
    x |>
      mult(2) |>
      add(3) |>
      reciprocal()