Migration level: Difference between revisions

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{| class=wikitable
{| class=wikitable
| <source lang=apl inline>⎕ML=0</source>
| <syntaxhighlight lang=apl inline>⎕ML=0</source>
| <source lang=apl inline>Z←∊R</source>
| <syntaxhighlight lang=apl inline>Z←∊R</source>
| Monadic <source lang=apl inline>∊</source> is interpreted as [[Type]] rather than [[Enlist]].
| Monadic <syntaxhighlight lang=apl inline>∊</source> is interpreted as [[Type]] rather than [[Enlist]].
|-
|-
| <source lang=apl inline>⎕ML=1</source>
| <syntaxhighlight lang=apl inline>⎕ML=1</source>
|  
|  
| Default behaviour
| Default behaviour
|-
|-
| rowspan=3 | <source lang=apl inline>⎕ML≥2</source>
| rowspan=3 | <syntaxhighlight lang=apl inline>⎕ML≥2</source>
| <source lang=apl inline>Z←↑R</source>
| <syntaxhighlight lang=apl inline>Z←↑R</source>
| Monadic <source lang=apl inline>↑</source> is interpreted as [[First]] rather than [[Mix]].
| Monadic <syntaxhighlight lang=apl inline>↑</source> is interpreted as [[First]] rather than [[Mix]].
|-
|-
| <source lang=apl inline>Z←⊃R</source>
| <syntaxhighlight lang=apl inline>Z←⊃R</source>
| Monadic <source lang=apl inline>⊃</source> is interpreted as [[Mix]] rather than [[First]].
| Monadic <syntaxhighlight lang=apl inline>⊃</source> is interpreted as [[Mix]] rather than [[First]].
|-  
|-  
| <source lang=apl inline>Z←≡R</source>
| <syntaxhighlight lang=apl inline>Z←≡R</source>
| Monadic <source lang=apl inline>≡</source> returns a positive rather than a negative value, if its argument has non-uniform [[depth]].
| Monadic <syntaxhighlight lang=apl inline>≡</source> returns a positive rather than a negative value, if its argument has non-uniform [[depth]].
|-
|-
| rowspan=2| <source lang=apl inline>⎕ML=3</source>
| rowspan=2| <syntaxhighlight lang=apl inline>⎕ML=3</source>
| <source lang=apl inline>R←X⊂[K]Y</source>
| <syntaxhighlight lang=apl inline>R←X⊂[K]Y</source>
| Dyadic <source lang=apl inline>⊂</source> is interpreted as [[Partition]] (<source lang=apl inline>⊆</source>) rather than [[Partitioned Enclose]].
| Dyadic <syntaxhighlight lang=apl inline>⊂</source> is interpreted as [[Partition]] (<syntaxhighlight lang=apl inline>⊆</source>) rather than [[Partitioned Enclose]].
|-  
|-  
| <source lang=apl inline>⎕TC</source>
| <syntaxhighlight lang=apl inline>⎕TC</source>
| The order of the elements of <source lang=apl inline>⎕TC</source> is the same as in APL2.
| The order of the elements of <syntaxhighlight lang=apl inline>⎕TC</source> is the same as in APL2.
|}
|}


=== Work-arounds ===
=== Work-arounds ===
When migrating to Dyalog APL, the below drop-ins for the affected [[built-ins]] allow setting <source lang=apl inline>⎕ML←1</source> while preserving code behaviour. It is then safe to programmatically (as shown in the rightmost column) change all occurrences of the affected built-ins with their respective covers.
When migrating to Dyalog APL, the below drop-ins for the affected [[built-ins]] allow setting <syntaxhighlight lang=apl inline>⎕ML←1</source> while preserving code behaviour. It is then safe to programmatically (as shown in the rightmost column) change all occurrences of the affected built-ins with their respective covers.


{| class=wikitable
{| class=wikitable
! Migrating from !! Define !! Then run this on all code
! Migrating from !! Define !! Then run this on all code
|-
|-
| <source lang=apl inline>⎕ML=0</source>
| <syntaxhighlight lang=apl inline>⎕ML=0</source>
| <source lang=apl>Epsilon←{×⎕NC'⍺':⍺∊⍵ ⋄ ⊃0⍴⊂⍵}</source>
| <syntaxhighlight lang=apl>Epsilon←{×⎕NC'⍺':⍺∊⍵ ⋄ ⊃0⍴⊂⍵}</source>
| <source lang=apl inline>'''[^'']+''' '∊'⎕R'&' 'Epsilon'</source>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '∊'⎕R'&' 'Epsilon'</source>
|-
|-
| <source lang=apl inline>⎕ML=2</source>
| <syntaxhighlight lang=apl inline>⎕ML=2</source>
| <source lang=apl>
| <syntaxhighlight lang=apl>
UpArrow←{×⎕NC'⍺':⍺↑⍵ ⋄ ⊃⍵}
UpArrow←{×⎕NC'⍺':⍺↑⍵ ⋄ ⊃⍵}
RightShoe←{×⎕NC'⍺':⍺↑⍵ ⋄ ↑⍵}
RightShoe←{×⎕NC'⍺':⍺↑⍵ ⋄ ↑⍵}
EqualUnderbar←|≡
EqualUnderbar←|≡
</source>
</source>
| <source lang=apl inline>'''[^'']+''' '↑' '⊃' '≡'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar'</source>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '↑' '⊃' '≡'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar'</source>
|-
|-
| <source lang=apl inline>⎕ML=3</source>
| <syntaxhighlight lang=apl inline>⎕ML=3</source>
| <source lang=apl>
| <syntaxhighlight lang=apl>
UpArrow←{×⎕NC'⍺':⍺↑⍵ ⋄ ⊃⍵}
UpArrow←{×⎕NC'⍺':⍺↑⍵ ⋄ ⊃⍵}
RightShoe←{×⎕NC'⍺':⍺↑⍵ ⋄ ↑⍵}
RightShoe←{×⎕NC'⍺':⍺↑⍵ ⋄ ↑⍵}
Line 62: Line 62:
quadTC←(⎕UCS 8 13 10)
quadTC←(⎕UCS 8 13 10)
</source>
</source>
| <source lang=apl inline>'''[^'']+''' '↑' '⊃' '≡' '⊂' '⎕TC'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar' 'LeftShoe' ' quadTC'</source>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '↑' '⊃' '≡' '⊂' '⎕TC'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar' 'LeftShoe' ' quadTC'</source>
|}
|}
Alternatively, the definitions can be used directly inside the text substitutions, whereby one avoids polluting existing code with these cover names.
Alternatively, the definitions can be used directly inside the text substitutions, whereby one avoids polluting existing code with these cover names.
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{|class=wikitable
{|class=wikitable
| <source lang=apl inline>⎕CS←1</source> || [[Strand notation|Stranding]] is done before [[bracket indexing]]
| <syntaxhighlight lang=apl inline>⎕CS←1</source> || [[Strand notation|Stranding]] is done before [[bracket indexing]]
|-
|-
| <source lang=apl inline>⎕CS←2</source> || The [[name class]] of an invalid name is 4 rather than ¯1.
| <syntaxhighlight lang=apl inline>⎕CS←2</source> || The [[name class]] of an invalid name is 4 rather than ¯1.
|-
|-
| <source lang=apl inline>⎕CS←4</source> || Format (<source lang=apl inline>⍕</source>) and default output uses the same width for all columns, rather than determining  the  width separately for  each column.
| <syntaxhighlight lang=apl inline>⎕CS←4</source> || Format (<syntaxhighlight lang=apl inline>⍕</source>) and default output uses the same width for all columns, rather than determining  the  width separately for  each column.
|}
|}


Revision as of 22:20, 10 September 2022

⎕ML ⎕EL ⎕CS

Migration level (⎕ML, ⎕EL, ⎕CS), Evolution level, or Compatibility setting is a number that, in Dyalog APL, APL+Win, and APLX respectively, specifies exact behaviour relative to APL2. In Dyalog APL and APL+Win, a lower value represents a behaviour closer to the original NARS specification, while a higher the value represents a behaviour closer to APL2. In APLX, a lower value matches APL2 while a higher value indicates higher backwards compatibility with APL.68000.

APL+Win settings

[TBD]

Dyalog settings

Dyalog APL currently offers the following settings:

<syntaxhighlight lang=apl inline>⎕ML=0</source> <syntaxhighlight lang=apl inline>Z←∊R</source> Monadic <syntaxhighlight lang=apl inline>∊</source> is interpreted as Type rather than Enlist.
<syntaxhighlight lang=apl inline>⎕ML=1</source> Default behaviour
<syntaxhighlight lang=apl inline>⎕ML≥2</source> <syntaxhighlight lang=apl inline>Z←↑R</source> Monadic <syntaxhighlight lang=apl inline>↑</source> is interpreted as First rather than Mix.
<syntaxhighlight lang=apl inline>Z←⊃R</source> Monadic <syntaxhighlight lang=apl inline>⊃</source> is interpreted as Mix rather than First.
<syntaxhighlight lang=apl inline>Z←≡R</source> Monadic <syntaxhighlight lang=apl inline>≡</source> returns a positive rather than a negative value, if its argument has non-uniform depth.
<syntaxhighlight lang=apl inline>⎕ML=3</source> <syntaxhighlight lang=apl inline>R←X⊂[K]Y</source> Dyadic <syntaxhighlight lang=apl inline>⊂</source> is interpreted as Partition (<syntaxhighlight lang=apl inline>⊆</source>) rather than Partitioned Enclose.
<syntaxhighlight lang=apl inline>⎕TC</source> The order of the elements of <syntaxhighlight lang=apl inline>⎕TC</source> is the same as in APL2.

Work-arounds

When migrating to Dyalog APL, the below drop-ins for the affected built-ins allow setting <syntaxhighlight lang=apl inline>⎕ML←1</source> while preserving code behaviour. It is then safe to programmatically (as shown in the rightmost column) change all occurrences of the affected built-ins with their respective covers.

Migrating from Define Then run this on all code
<syntaxhighlight lang=apl inline>⎕ML=0</source> <syntaxhighlight lang=apl>Epsilon←{×⎕NC'⍺':⍺∊⍵ ⋄ ⊃0⍴⊂⍵}</source> <syntaxhighlight lang=apl inline>[^]+ '∊'⎕R'&' 'Epsilon'</source>
<syntaxhighlight lang=apl inline>⎕ML=2</source> <syntaxhighlight lang=apl>

UpArrow←{×⎕NC'⍺':⍺↑⍵ ⋄ ⊃⍵} RightShoe←{×⎕NC'⍺':⍺↑⍵ ⋄ ↑⍵} EqualUnderbar←|≡ </source>

<syntaxhighlight lang=apl inline>[^]+ '↑' '⊃' '≡'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar'</source>
<syntaxhighlight lang=apl inline>⎕ML=3</source> <syntaxhighlight lang=apl>

UpArrow←{×⎕NC'⍺':⍺↑⍵ ⋄ ⊃⍵} RightShoe←{×⎕NC'⍺':⍺↑⍵ ⋄ ↑⍵} EqualUnderbar←(|≡) LeftShoe←{×⎕NC'⍺':⍺⊆⍵ ⋄ ⊂⍵} quadTC←(⎕UCS 8 13 10) </source>

<syntaxhighlight lang=apl inline>[^]+ '↑' '⊃' '≡' '⊂' '⎕TC'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar' 'LeftShoe' ' quadTC'</source>

Alternatively, the definitions can be used directly inside the text substitutions, whereby one avoids polluting existing code with these cover names.

APLX settings

APLX treats the value as a collection of individual bits, thus allowing the combination of an exact set of behaviours:

<syntaxhighlight lang=apl inline>⎕CS←1</source> Stranding is done before bracket indexing
<syntaxhighlight lang=apl inline>⎕CS←2</source> The name class of an invalid name is 4 rather than ¯1.
<syntaxhighlight lang=apl inline>⎕CS←4</source> Format (<syntaxhighlight lang=apl inline>⍕</source>) and default output uses the same width for all columns, rather than determining the width separately for each column.

External links

Documentation

APL built-ins [edit]
Primitives (Timeline) Functions
Scalar
Monadic Conjugate ∙ Negate ∙ Signum ∙ Reciprocal ∙ Magnitude ∙ Exponential ∙ Natural Logarithm ∙ Floor ∙ Ceiling ∙ Factorial ∙ Not ∙ Pi Times ∙ Roll ∙ Type ∙ Imaginary ∙ Square Root ∙ Round
Dyadic Add ∙ Subtract ∙ Times ∙ Divide ∙ Residue ∙ Power ∙ Logarithm ∙ Minimum ∙ Maximum ∙ Binomial ∙ Comparison functions ∙ Boolean functions (And, Or, Nand, Nor) ∙ GCD ∙ LCM ∙ Circular ∙ Complex ∙ Root
Non-Scalar
Structural Shape ∙ Reshape ∙ Tally ∙ Depth ∙ Ravel ∙ Enlist ∙ Table ∙ Catenate ∙ Reverse ∙ Rotate ∙ Transpose ∙ Raze ∙ Mix ∙ Split ∙ Enclose ∙ Nest ∙ Cut (K) ∙ Pair ∙ Link ∙ Partitioned Enclose ∙ Partition
Selection First ∙ Pick ∙ Take ∙ Drop ∙ Unique ∙ Identity ∙ Stop ∙ Select ∙ Replicate ∙ Expand ∙ Set functions (Intersection ∙ Union ∙ Without) ∙ Bracket indexing ∙ Index ∙ Cartesian Product ∙ Sort
Selector Index generator ∙ Grade ∙ Index Of ∙ Interval Index ∙ Indices ∙ Deal ∙ Prefix and suffix vectors
Computational Match ∙ Not Match ∙ Membership ∙ Find ∙ Nub Sieve ∙ Encode ∙ Decode ∙ Matrix Inverse ∙ Matrix Divide ∙ Format ∙ Execute ∙ Materialise ∙ Range
Operators Monadic Each ∙ Commute ∙ Constant ∙ Replicate ∙ Expand ∙ Reduce ∙ Windowed Reduce ∙ Scan ∙ Outer Product ∙ Key ∙ I-Beam ∙ Spawn ∙ Function axis ∙ Identity (Null, Ident)
Dyadic Bind ∙ Compositions (Compose, Reverse Compose, Beside, Withe, Atop, Over) ∙ Inner Product ∙ Determinant ∙ Power ∙ At ∙ Under ∙ Rank ∙ Depth ∙ Variant ∙ Stencil ∙ Cut ∙ Direct definition (operator) ∙ Identity (Lev, Dex)
Quad names Index origin ∙ Comparison tolerance ∙ Migration level ∙ Atomic vector
APL glyphs [edit]
Information Glyph ∙ Typing glyphs (on Linux) ∙ Unicode ∙ Fonts ∙ Mnemonics ∙ Overstrikes ∙ Migration level
Individual glyphs Jot (∘) ∙ Right Shoe (⊃) ∙ Up Arrow (↑) ∙ Zilde (⍬) ∙ High minus (¯) ∙ Dot (.) ∙ Del (∇)
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