grid_dup: Duplicates of expand.grid for 2 Variables

In ichimoku: Visualization and Tools for Ichimoku Kinko Hyo Strategies

Duplicates of expand.grid for 2 Variables

Description

Create a vector of element positions of duplicates in the output of expand.grid on 2 identical vectors. An efficient method of creating combinations for 2 variables.

Usage

grid_dup(n, omit.id)

Arguments

n	the length of vector passed to expand.grid().
omit.id	(optional) set to TRUE to also select the elements where the 2 items are identical. The output of expand.grid, subset to remove duplicates with 'omit.id' set to TRUE would be the equivalent of utils::combn(n, 2).

Value

A numeric vector.

Examples

n <- 3
expand.grid(1:n, 1:n)
expand.grid(1:n, 1:n)[-grid_dup(n), ]
expand.grid(1:n, 1:n)[-grid_dup(n, omit.id = TRUE), ]

ichimoku documentation built on April 4, 2025, 2:24 a.m.