On Sep 5, 2009, at 11:27 AM, Roger Hui wrote: > NO DATA, like NaN, should be treated with caution. > For example, what are the answers to the following > questions?
I'm sorry that I didn't answer your questions in my previous reply. The following are my suggestions: > NODATA = NODATA 1 > NODATA = 314159 0 > NODATA ~: NODATA 0 > NODATA > NODATA Domain error > $ NODATA NODATA > 3 $ NODATA NODATA NODATA NODATA > NODATA $ 3 NODATA > 3+NODATA NODATA > 0 1 2,NODATA 0 1 2 NODATA > /: 0 1 2,NODATA Domain error (applying an comparison operator between NODATA and any other kind of value results in a Domain error). As a special case, NODATA == > < NODATA +--------+ | NODATA | +--------+ >> NODATA Domain error > NODATA e. a. 0 > Last but not least, > > NODATA=NaN 0 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
