= DyalogMigrationLevels =

The system variable `⎕ML` determines the degree of compatability of Dyalog APL towards IBM's APL2. In general, the value 0 represents "native Dyalog". The higher the value, the closer to APL2/

For the time being (2009), 3 is the highest level of compatability one can achieve.

Note that with a default installation `⎕ML` is set to `1`.

||<tablebgcolor="#ffe" tablestyle="margin-top:1em;font-size:medium">'''ML setting'''||'''APL'''||'''Remarks'''||
||`⎕ML←0` ||      || Native Dyalog (Default) ||
||`⎕ML←1` || `∊R` || Monadic `∊` is interpreted as 'enlist' rather than 'type' ||
||`⎕ML←2` || `↑R` || Monadic `↑` is interpreted as 'first' rather than 'mix'  ||
||      || `⊃R` || Monadic `⊃` is interpreted as 'mix' rather than 'first'  ||
||      || `≡­R`  || For an array with unequal levels of nesting in its subarrays,<<BR>>depth returns the maximum level of nesting.  With `⎕ml≤2` <<BR>>depth returns a negative value if the subarrays have unequal depth||
||`⎕ML←3` || `X⊂[K]Y` || Dyadic `⊂` follows the APL2 rather than the original Dyalog convention ||
||      || `⎕TC`  || The order of the elements of `⎕TC` is the same as in APL2  ||
CategoryDyalog