# power2grid: Create grid for root search. In exact2x2: Exact Tests and Confidence Intervals for 2x2 Tables

## Description

Used with `unirootGrid`

## Usage

 ```1 2 3``` ```power2grid(power2 = 3, from = 10, to = 1, dolog = TRUE) power2gridRatio(power2 = 3) power2gridDifference(power2 = 3) ```

## Arguments

 `power2` positive integer, determines length of grid, `length(grid)=1+2^power2` `from` lowest value of grid `to` highest value of grid `dolog` logical, make grid equally spaced on the log scale?

## Details

The function `power2gridRatio` gives a grid for searching from 0 to Inf equally spaced on the log scale, with about half of the observations from 0.5 to 2. and `power2gridDifference` gives an equally spaced grid for searching from -1 to 1.

## Value

a vector for grid search of length `1+2^power2` for use in `unirootGrid`

`unirootGrid`
 ```1 2 3 4 5``` ```power2gridRatio(3) power2gridDifference(3) power2grid(3,from=-1,to=1,dolog=FALSE) power2grid(3, from=1,to=9, dolog=FALSE) power2grid(3, from=1,to=9, dolog=TRUE) ```