relevel.im: Reorder Levels of a Factor-Valued Image or Pattern
Description
For a pixel image with factor values, or a point pattern with
factor-valued marks, the levels of the factor are re-ordered so that
the level ref is first and the others are moved down.
Usage
## S3 method for class 'im':
relevel(x, ref, \dots)
## S3 method for class 'ppp':
relevel(x, ref, \dots)
## S3 method for class 'ppx':
relevel(x, ref, \dots)
Arguments
x
A pixel image (object of class "im") with factor values,
or a point pattern (object of class "ppp", "ppx",
"lpp" or "pp3") with
factor-valued marks.
ref
The reference level.
...
Ignored.
Value
Object of the same kind as x.
Details
These functions are methods for the generic
relevel.
If x is a pixel image (object of class "im") with
factor values, or a point pattern (object of class "ppp",
"ppx", "lpp" or "pp3")
with factor-valued marks, the levels of the factor are changed so
that the level specified by ref comes first.