affine.owin
From spatstat v1.25-5
by Adrian Baddeley
Apply Affine Transformation To Window
Applies any affine transformation of the plane (linear transformation plus vector shift) to a window.
Usage
## S3 method for class 'owin':
affine(X, mat=diag(c(1,1)), vec=c(0,0), ..., rescue=TRUE)
Arguments
- X
- Window (object of class
"owin"
). - mat
- Matrix representing a linear transformation.
- vec
- Vector of length 2 representing a translation.
- rescue
- Logical. If
TRUE
, the transformed window will be processed byrescue.rectangle
. - ...
- Optional arguments passed to
as.mask
controlling the pixel resolution of the transformed window, ifX
is a binary pixel mask.
Details
The window is subjected first to the linear transformation represented by
mat
(multiplying on the left by mat
),
and then the result is translated by the vector vec
.
The argument mat
must be a nonsingular $2 \times 2$
matrix.
This is a method for the generic function affine
.
Value
- Another window (of class
"owin"
) representing the result of applying the affine transformation.
See Also
Examples
# shear transformation
shear <- matrix(c(1,0,0.6,1),ncol=2)
X <- affine(owin(), shear)
plot(X)
data(letterR)
affine(letterR, shear, c(0, 0.5))
affine(as.mask(letterR), shear, c(0, 0.5))
Community examples
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