mask {nat}

Mask an object, typically to produce a copy with some values zeroed out

Description

Mask an object, typically to produce a copy with some values zeroed out

Usage

mask(x, ...)

## S3 method for class 'im3d'
mask(x, mask, levels = NULL, rval = c("im3d", "values"), invert = FALSE, ...)

Arguments

x

Object to be masked

...

Additional arguments passed to methods

mask

An im3d object, an array or a vector with dimensions compatible with x.

levels

Optional numeric vector of pixel values or character vector defining named materials.

rval

Whether to return an im3d object based on x or just the values from x matching the mask.

invert

Whether to invert the voxel selection (default FALSE)

Details

Note that mask.im3d passes ... arguments on to im3d

Value

an oject with attributes matching x and elements with value as.vector(TRUE, mode=mode) i.e. TRUE, 1, 0x01 and as.vector(FALSE, mode=mode) i.e. FALSE, 0, 0x00 as appropriate.

A copy of x with

See Also

Other im3d: as.im3d(), boundingbox(), im3d-coords, im3d-io, im3d(), imexpand.grid(), imslice(), is.im3d(), origin(), projection(), threshold(), unmask(), voxdims()

Examples

x=im3d(array(rnorm(1000),dim=c(10,10,10)), BoundingBox=c(20,200,100,200,200,300))
m=array(1:5,dim=c(10,10,10))
image(x[,,1])
image(mask(x, mask=m, levels=1)[,,1])
image(mask(x, mask=m, levels=1:2)[,,1])