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→Frame conformability: NARS2000 has singleton extension for frame conformability
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== Frame conformability == | == Frame conformability == | ||
{{main|Frame agreement}} | |||
The [[Rank operator]] and [[function rank]] check for conformability not on the entire [[shape]]s of arguments, but only on their [[frame]]s. The same procedure applies to determine whether two frames conform, and if function <syntaxhighlight lang=apl inline>f</syntaxhighlight>'s result shape is known, then the result shape of <syntaxhighlight lang=apl inline>f⍤l r</syntaxhighlight> can be found by appending it to the shape obtained from conformability on the frames computed from [[Rank (operator)|ranks]] <syntaxhighlight lang=apl inline>l</syntaxhighlight> and <syntaxhighlight lang=apl inline>r</syntaxhighlight>. Rather than copying [[element]]s of the extended argument to match the other one, [[cell]]s are copied. | |||
Frame conformability may not allow [[singleton extension]] even when ordinary conformability supports it: [[Dyalog APL]], [[SHARP APL]], and [[A+]] have singleton extension for scalar dyadics but not for Rank (and [[J]] doesn't implement singleton extension). Of these, [[J]] and [[A+]] use [[leading axis agreement]] while SHARP and Dyalog use only empty-frame extension, the equivalent of scalar extension. However, [[NARS2000]] implements Rank with singleton extension for frames. | |||
== External links == | == External links == | ||
* [https://forums.dyalog.com/viewtopic.php?f=30&t=1621 Scalar functions] and [https://forums.dyalog.com/viewtopic.php?f=30&t=1622 Tally and scalar functions] by [[Roger Hui]] | * [https://forums.dyalog.com/viewtopic.php?f=30&t=1621 Scalar functions] and [https://forums.dyalog.com/viewtopic.php?f=30&t=1622 Tally and scalar functions] by [[Roger Hui]] | ||
{{APL features}} | {{APL features}}[[Category:Function characteristics]][[Category:Conformability]] | ||