_. Indeterminate

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Indeterminate _.

The indeterminate _. is a numeric atom. It is provided to aid in dealing with NaN (not a number) in data from external sources, and should be removed from such data as soon as possible. The verb128!:5 tests for _. .

The only ways to create _. are as follows:

direct entry of _.

".

3!:n

DLL call (database, LAPACK, etc.)

Primitives on arguments containing _. ,that move data without interpreting the value, produce correct and consistent results. These include $ |. |: # , ,. [ ] { {. {: } }. }: . Other primitives on arguments containing _. may not produce correct or consistent results. In particular, the dyads < <: = >: > ~: -: <. >. do not produce consistent results on arguments containing _. , nor the verbs /: \: ,nor the dyads i. i: e. -. ,nor the monads ~. ~: ,nor verbs defined in terms of these.

Primitives on arguments not containing _. signal NaN error instead of producing _. .

x+y x and y are infinite with different signs

x-y x and y are infinite with the same sign

*y the real and imaginary parts of y are infinite

x%y x and y are infinite

x^.y x and y are infinite or 0

x!y x and y are infinite

m H. n similar to the dyad p.

x p. y x and y that cause addition of infinities with opposite signs; for example 1 _ _ p. _1

u T. n y similar to the dyad p.

0*_ , 0*__ ,and 0%0 are all defined to be 0 .

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