37 ppp
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Chapter 37 outlines the S3 methods currently not planned for the class 'ppp' (Chapter 24).
37.1 na.*()
Other than the S3 methods na.omit.ppp() and na.exclude.ppp() (Section 24.1), the author does not implement the S3 methods of the generic functions na.fail() and na.pass() to a point-pattern. The author may implement one or both of them in future.