http://i.imgur.com/7vMrDan.jpg

          ?(3⍴5) (2 3⍴10)
    DOMAIN ERROR
          ?(3⍴5)(2 3⍴10)
          ^^
          (3⍴5) (2 3⍴10)
     5 5 5   10 10 10
             10 10 10
          ?(3⍴5)
    5 3 4
          ?(2 3⍴10)
    9  6 5
    5 10 7
          ?(3⍴5) 30     
    DOMAIN ERROR
          ?(3⍴5)30
          ^^


In MicroAPL, this supposedly works, as is indicated by the documentation
here
http://www.microapl.co.uk/apl_help/ch_020_020_170.htm -- last example


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