Combine two line segment patterns into a single pattern.
Line segment patterns (objects of class
This function is used to superimpose two line segment patterns
The two patterns must have identical windows. If one pattern has marks, then the other must also have marks of the same type. It the marks are data frames then the number of columns of these data frames, and the names of the columns must be identical.
(To combine two point patterns, see
If one of the arguments is
NULL, it will be ignored
and the other argument will be returned.
Another line segment pattern (object of class
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