Kip Murray wrote: > > How do you check arguments for a tacit verb? Say it's monadic"0 and I > want the argument to be > real and positive excluding _ (infinity). If no, halt with an error > message; if yes, process > the argument, say take the natural logarithm. /Kip Murray > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > Assert=:[:`...@. (<&_ * >&0) Assert [:`...@.(<&_ * >&0) (<&_ * >&0) Assert"0 (1 2 3 4) 1 2 3 4 (<&_ * >&0) Assert"0 (1 2 3 4 0) |domain error | (<&_*>&0)Assert"0(1 2 3 4 0) ^. (<&_ * >&0) Assert"0 (1 2 3 4) 0 0.693147 1.09861 1.38629
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