greta (version 0.4.5)

structures: create data greta arrays

Description

These structures can be used to set up more complex models. For example, scalar parameters can be embedded in a greta array by first creating a greta array with zeros() or ones(), and then embedding the parameter value using greta's replacement syntax.

Usage

zeros(...)
ones(...)
greta_array(data = 0, dim = length(data))

Value

a greta array object

Arguments

...

dimensions of the greta arrays to create

data

a vector giving data to fill the greta array. Other object types are coerced by as.vector().

dim

an integer vector giving the dimensions for the greta array to be created.

Details

greta_array is a convenience function to create an R array with array() and then coerce it to a greta array. I.e. when passed something that can be coerced to a numeric array, it is equivalent to as_data(array(data, dim)).

If data is a greta array and dim is different than dim(data), a reshaped greta array is returned. This is equivalent to: dim(data) <- dim.

Examples

if (FALSE) {

# a 3 row, 4 column greta array of 0s
z <- zeros(3, 4)

# a 3x3x3 greta array of 1s
z <- ones(3, 3, 3)

# a 2x4 greta array filled with pi
z <- greta_array(pi, dim = c(2, 4))

# a 3x3x3 greta array filled with 1, 2, and 3
z <- greta_array(1:3, dim = c(3, 3, 3))
}