)CLEAR
CLEAR WS
      ⎕IO
1
      a←b←5 5⍴⍳25
      a[⍳5;]←b
      a←b←⍕a
      a
 1  2  3  4  5
 6  7  8  9 10
11 12 13 14 15
16 17 18 19 20
21 22 23 24 25
      ⍴a
5 14
      a[⍳5;]←b
LENGTH ERROR
      a[⍳5;]←b
      ^      ^

Of course the numeric one is the correct one.

Blake

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