Combine two line segment patterns into a single pattern.
Usage
append.psp(A, B)
Arguments
A,B
Line segment patterns (objects of class "psp").
Value
Another line segment pattern (object of class "psp").
Details
This function is used to superimpose two line segment patterns
A and B.
The two patterns must have identical windows. If one
pattern has marks, then the other must also have marks
of the same type.