spatstat (version 1.55-1)

im.apply: Apply Function Pixelwise to List of Images

Description

Returns a pixel image obtained by applying a function to the values of corresponding pixels in several pixel images.

Usage

im.apply(X, FUN, ...)

Arguments

X

A list of pixel images (objects of class "im").

FUN

A function that can be applied to vectors, or a character string giving the name of such a function.

…

Additional arguments to FUN.

Value

A pixel image (object of class "im").

Details

The argument X should be a list of pixel images (objects of class "im"). If the images do not have identical pixel grids, they will be converted to a common grid using harmonise.im.

At each pixel location, the values of the images in X at that pixel will be extracted as a vector. The function FUN will be applied to this vector. The result (which should be a single value) becomes the pixel value of the resulting image.

See Also

eval.im for algebraic operations with images.

Examples

# NOT RUN {
  DA <- density(split(amacrine))
  DA
  im.apply(DA, max)
# }