NULL == 1 returns logical(0)

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NULL == 1 returns logical(0)



Why does NULL == 1 returns logical(0) instead of FALSE?


NULL == 1


logical(0)


FALSE



identical(1, NULL) returns FALSE, which is correct.


identical(1, NULL)


FALSE



I know that == and identical cannot be used interchangeably, but what goes behind NULL == 1 returning logical(0)?


==


identical


NULL == 1


logical(0)





Because length(NULL) returns zero. To test a NULL use is.null, as in is.null(1).
– Rui Barradas
Aug 13 at 8:27


length(NULL)


NULL


is.null


is.null(1)





More info in this SO post
– phiver
Aug 13 at 8:38









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