convert n-dimensional real world coordinates to grid coordinates

Usage

coord_to_grid(x, coords)

# S4 method for class 'NeuroSpace,matrix'
coord_to_grid(x, coords)

# S4 method for class 'NeuroSpace,numeric'
coord_to_grid(x, coords)

# S4 method for class 'NeuroObj,ANY'
coord_to_grid(x, coords)

# S4 method for class 'NeuroSpace,data.frame'
coord_to_grid(x, coords)

# S4 method for class 'NeuroVol,matrix'
coord_to_grid(x, coords)

# S4 method for class 'NeuroVol,numeric'
coord_to_grid(x, coords)

Arguments

x: the object: a NeuroSpace, or anything that has one, such as a NeuroVol or NeuroVec
coords: real world coordinates: a matrix or data frame with one point per row, or a vector giving a single point

Value

A numeric matrix of grid coordinates, or a vector when coords is a single point.

Examples

# Create a simple 3D volume
bvol <- NeuroVol(array(0, c(10,10,10)), NeuroSpace(c(10,10,10), c(1,1,1)))
coords <- matrix(c(.5,.5,.5, 1.5,1.5,1.5), ncol=3, byrow=TRUE)
grid <- coord_to_grid(bvol, coords)
world <- grid_to_coord(bvol, grid)
all.equal(coords, world)
#> [1] TRUE