Tally

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Z←≢R returns an integer scalar identical to ⍬⍴(⍴R),1.
R is an arbitrary array.
Z is an integer scalar whose value is the number of items along the first coordinate of R.


For example,

      ≢⍬
0
      ≢23
1
      ≢,23
1
      ≢2 3 4⍴5 6
2

This symbol was suggested by the language designers of Dyalog APL.