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

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