⎕ML determines the degree of migration of the Dyalog APL language towards IBM's APL2. Setting this variable to other than its default value of 1 changes the interpretation of certain symbols and language constructs.
⎕ML←0 | Original Native Dyalog | |
⎕ML←1 | Z←∊R | Monadic '∊' is interpreted as 'enlist' rather than 'type'. |
⎕ML←2 | Z←↑R | Monadic '↑' is interpreted as 'first' rather than 'mix'. |
Z←⊃R | Monadic '⊃' is interpreted as 'mix' rather than 'first'. | |
Z←≡R | Monadic '≡' returns a positive rather than a negative value, if its argument has non-uniform depth. | |
⎕ML←3 | R←X⊂[K]Y | Dyadic '⊂' follows the APL2 (rather than the original Dyalog APL) convention. |
⎕TC | The order of the elements of ⎕TC is the same as in APL2. |
Subsequent versions of Dyalog APL may provide further migration levels.
X←2(3 4) ⎕ML←0 ∊X 0 0 0 ↑X 2 0 3 4 ⊃X 2 ≡X ¯2 ⎕ML←1 ∊X 2 3 4 ↑X 2 0 3 4 ⊃X 2 ≡X ¯2
⎕ML←2 ∊X 2 3 4 ↑X 2 ⊃X 2 0 3 4 ≡X 2