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Oneargument formThe DAYS←'MONDAY' 'TUESDAY' ⍴¨DAYS 6 7 DATA←(2 2⍴⍳4) (⍳10) 97.3 (3 4⍴'K') ⍴DATA (Length 4 nested vector) 4 ⍴¨DATA (Shape of each element, note empty vector 2 2 10 3 4 shape for element 3, the scalar) ⍴⍴¨DATA (4 shapes returned) 4 ⍴¨⍴¨DATA (The shape of each of the shapes  the 2 1 0 2 ranks  of each element) Twoargument formThe twoargument form of each applies is left argument and its operand to each element of its right argument. Again, for empty left or right arguments, a fill function is applied. (1 2 3),¨4 5 6 (Joining successive pairs of elements in 1 4 2 5 3 6 the left and right arguments) 2 3↑¨'MONDAY' 'TUESDAY' (2↑ of first element of right argument MO TUE 3↑ of the second) 2↑¨'MONDAY' 'TUESDAY' (Scalar extension results in 2↑ of each MO TU element of the right argument) 2 3⍴¨1 2 (2⍴ of first element, 3⍴ of second) 1 1 2 2 2 4 5⍴¨'THE' 'CAT' THET CATCA 

APLX Help : Help on APL language : APL Primitives : ¨ Each

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