R: Create grid for root search.

power2grid {exact2x2} | R Documentation

## Create grid for root search.

### Description

Used with `unirootGrid`

### Usage

    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`

### See Also

`unirootGrid`

### Examples

    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)

[Package exact2x2 version 1.6.3 Index]