Test Whether A Point Pattern is Multitype
Tests whether a point pattern has “marks” attached to the points which classify the points into several types.
## S3 method for class 'ppp' is.multitype(X, na.action="warn", ...)
X |
Point pattern (object of class |
na.action |
String indicating what to do if |
... |
Ignored. |
“Marks” are observations attached to each point of a point pattern.
For example the longleaf dataset
contains the locations of trees, each tree being marked by its diameter;
the amacrine dataset gives the locations of cells
of two types (on/off) and the type of cell may be regarded as a mark attached
to the location of the cell.
This function tests whether the point pattern X
contains or involves marked points, and that the
marks are a factor.
It is a method for the generic function is.multitype.
The argument na.action determines what action will be taken
if the point pattern has a vector of marks but some or all of the
marks are NA. Options are "fatal" to cause a fatal
error; "warn" to issue a warning and then return TRUE;
and "ignore" to take no action except returning TRUE.
Logical value, equal to TRUE if X is a multitype point pattern.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au
and Rolf Turner r.turner@auckland.ac.nz
is.multitype(cells) #FALSE - no marks is.multitype(longleaf) #FALSE - real valued marks is.multitype(amacrine) #TRUE
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