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→Extensions for higher-rank left argument
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[[NARS2000]] simply compares items of X to the items of Y, and returns the nested array of shape of Y where each item indicates a multi-dimensional index in X. The index for not found items is <source lang=apl inline>⎕IO+⍴X</source>. This also works with [[scalar]] X, though the result (an array filled with empty vectors) is not very meaningful. | [[NARS2000]] simply compares items of X to the items of Y, and returns the nested array of shape of Y where each item indicates a multi-dimensional index in X. The index for not found items is <source lang=apl inline>⎕IO+⍴X</source>. This also works with [[scalar]] X, though the result (an array filled with empty vectors) is not very meaningful. | ||
[[GNU APL]] follows the convention of NARS2000, with the exception that the index for not found items is an [[empty]] [[vector]] | [[GNU APL]] follows the convention of NARS2000, with the exception that the index for not found items is an [[empty]] [[vector]] (!) instead of <source lang=apl inline>⎕IO+⍴X</source>. | ||
== External links == | == External links == | ||