affine.lpp
From spatstat v1.41-1
by Adrian Baddeley
Apply Geometrical Transformations to Point Pattern on a Linear Network
Apply geometrical transformations to a point pattern on a linear network.
Usage
## S3 method for class 'lpp':
affine(X, mat=diag(c(1,1)), vec=c(0,0), ...) ## S3 method for class 'lpp':
shift(X, vec=c(0,0), ..., origin=NULL)
## S3 method for class 'lpp':
rotate(X, angle=pi/2, \dots, centre=NULL)
## S3 method for class 'lpp':
scalardilate(X, f, \dots)
## S3 method for class 'lpp':
rescale(X, s, unitname)
Arguments
- X
- Point pattern on a linear network (object of class
"lpp"
). - mat
- Matrix representing a linear transformation.
- vec
- Vector of length 2 representing a translation.
- angle
- Rotation angle in radians.
- f
- Scalar dilation factor.
- s
- Unit conversion factor: the new units are
s
times the old units. - ...
- Arguments passed to other methods.
- origin
- Character string determining a location
that will be shifted to the origin. Options are
"centroid"
,"midpoint"
and"bottomleft"
. Partially matched. - centre
- Centre of rotation.
Either a vector of length 2, or a character string
(partially matched to
"centroid"
,"midpoint"
or"bottomleft"
). The default is the coordinate originc(0,0)
. - unitname
- Optional. New name for the unit of length.
A value acceptable to the function
unitname<-
Details
These functions are methods for the generic functions
affine
,
shift
,
rotate
,
rescale
and
scalardilate
applicable to objects of class "lpp"
.
All of these functions
perform geometrical transformations on the object X
,
except for rescale
, which simply rescales the units of length.
Value
- Another point pattern on a linear network (object of class
"lpp"
) representing the result of applying the geometrical transformation.
See Also
lpp
.
Generic functions
affine
,
shift
,
rotate
,
scalardilate
,
rescale
.
Examples
X <- rpoislpp(2, simplenet)
U <- rotate(X, pi)
stretch <- diag(c(2,3))
Y <- affine(X, mat=stretch)
shear <- matrix(c(1,0,0.6,1),ncol=2, nrow=2)
Z <- affine(X, mat=shear, vec=c(0, 1))
Community examples
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