View source for Tally

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      <td valign="top"><apll>Z←≢R</apll></td>
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      <td>returns an integer scalar identical to <apll>⍬⍴(⍴R),1</apll>.</td>
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  <td><apll>R</apll> is an arbitrary array.</td>
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  <td><apll>Z</apll> is an integer scalar whose value is the number of items along the first coordinate of <apll>R</apll>.</td>
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<p>For example,</p>

<apll><pre>
      ≢⍬
0
      ≢23
1
      ≢,23
1
      ≢2 3 4⍴5 6
2</pre></apll>

<p>This symbol was suggested by the language designers of Dyalog APL.</p>