S3 Group Generic methods for List of Images

Description

These are group generic methods for the class "imlist" of lists of images. These methods allows the usual mathematical functions and operators to be applied directly to lists of images. See Details for a list of implemented functions.

Usage

## S3 methods for group generics have prototypes:
Math(x, \dots)
Ops(e1, e2)
Complex(z)
Summary(\dots, na.rm = TRUE)

Arguments

Details

Below is a list of mathematical functions and operators which are defined for lists of images. Not all functions will make sense for all types of images. For example, none of the functions in the "Math" group make sense for character-valued images. Note that the "Ops" group methods are implemented using eval.im, which tries to harmonise images via harmonise.im if they aren't compatible to begin with.

1. Group "Math":

   • abs, sign, sqrt,
     floor, ceiling, trunc,
     round, signif

   • exp, log, expm1, log1p,
     cos, sin, tan,
     cospi, sinpi, tanpi,
     acos, asin, atan

     cosh, sinh, tanh,
     acosh, asinh, atanh

   • lgamma, gamma, digamma, trigamma

   • cumsum, cumprod, cummax, cummin

2. Group "Ops":

   • "+", "-", "*", "/", "^", "%%", "%/%"

   • "&", "|", "!"

   • "==", "!=", "<", "<=", ">=", ">"

3. Group "Summary":

   • all, any

   • sum, prod

   • min, max

   • range

4. Group "Complex":

   • Arg, Conj, Im, Mod, Re

Value

The result of "Math", "Ops" and "Complex" group operations is another list of images. The result of "Summary" group operations is a numeric vector of length 1 or 2.

Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner r.turner@auckland.ac.nz and Ege Rubak rubak@math.aau.dk.

See Also

Math.im or eval.im for evaluating expressions involving images.

Examples

  a <- Smooth(finpines, 2)
  log(a)/2 - sqrt(a)
  range(a)