S3 Group Generic Methods for Images on a Linear Network
These are group generic methods for images of class "linim", which
allows for usual mathematical functions and operators to be applied
directly to pixel images on a linear network.
See Details for a list of implemented functions.
## S3 methods for group generics have prototypes: Math(x, ...) Ops(e1, e2) Complex(z) Summary(..., na.rm = FALSE)
x, z, e1, e2 |
objects of class |
... |
further arguments passed to methods. |
na.rm |
logical: should missing values be removed? |
An object of class "linim" represents a pixel image on
a linear network. See linim.
Below is a list of mathematical functions and operators which are
defined for these 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.linim.
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
Group "Ops":
"+", "-", "*", "/",
"^", "%%", "%/%"
"&", "|", "!"
"==", "!=",
"<", "<=", ">=", ">"
Group "Summary":
all, any
sum, prod
min, max
range
Group "Complex":
Arg, Conj, Im, Mod, Re
The return value is another object of class "linim",
except in the following cases:
all and any return a single
logical value; sum, prod, min and max
return a single numerical value; range returns a vector of two
numerical values.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner r.turner@auckland.ac.nz and Ege Rubak rubak@math.aau.dk.
eval.linim for evaluating expressions involving images.
fx <- function(x,y,seg,tp) { (x - y)^2 }
fL <- linfun(fx, simplenet)
Z <- as.linim(fL)
A <- Z+2
A <- -Z
A <- sqrt(Z)
A <- !(Z > 0.1)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.