Close composition
Revision as of 08:06, 26 April 2022 by Adám Brudzewsky (talk | contribs) (add modern column and syntax colouring)
In SHARP APL and J, a close composition is one of the operators Atop, Over, or Under, defined so that the overall result has function rank equal to the right operand. In SHARP all composition operators follow this pattern, while in J, both close and non-close forms (with a result rank of infinity, matching the definition in most modern APLs) are provided.
Operator | SHARP | J close | J non-close | Modern |
---|---|---|---|---|
Atop | ⍥ |
@ |
@: |
⍤
|
Over | ⍤ |
& |
&: |
⍥
|
Under | ¨ |
&. |
&.: |
⍢
|