Migration level: Difference between revisions

From APL Wiki
Jump to navigation Jump to search
m (Text replacement - "<source" to "<syntaxhighlight")
m (Text replacement - "</source>" to "</syntaxhighlight>")
Tags: Mobile edit Mobile web edit
Line 10: Line 10:


{| class=wikitable
{| class=wikitable
| <syntaxhighlight lang=apl inline>⎕ML=0</source>
| <syntaxhighlight lang=apl inline>⎕ML=0</syntaxhighlight>
| <syntaxhighlight lang=apl inline>Z←∊R</source>
| <syntaxhighlight lang=apl inline>Z←∊R</syntaxhighlight>
| Monadic <syntaxhighlight lang=apl inline>∊</source> is interpreted as [[Type]] rather than [[Enlist]].
| Monadic <syntaxhighlight lang=apl inline>∊</syntaxhighlight> is interpreted as [[Type]] rather than [[Enlist]].
|-
|-
| <syntaxhighlight lang=apl inline>⎕ML=1</source>
| <syntaxhighlight lang=apl inline>⎕ML=1</syntaxhighlight>
|  
|  
| Default behaviour
| Default behaviour
|-
|-
| rowspan=3 | <syntaxhighlight lang=apl inline>⎕ML≥2</source>
| rowspan=3 | <syntaxhighlight lang=apl inline>⎕ML≥2</syntaxhighlight>
| <syntaxhighlight lang=apl inline>Z←↑R</source>
| <syntaxhighlight lang=apl inline>Z←↑R</syntaxhighlight>
| Monadic <syntaxhighlight lang=apl inline>↑</source> is interpreted as [[First]] rather than [[Mix]].
| Monadic <syntaxhighlight lang=apl inline>↑</syntaxhighlight> is interpreted as [[First]] rather than [[Mix]].
|-
|-
| <syntaxhighlight lang=apl inline>Z←⊃R</source>
| <syntaxhighlight lang=apl inline>Z←⊃R</syntaxhighlight>
| Monadic <syntaxhighlight lang=apl inline>⊃</source> is interpreted as [[Mix]] rather than [[First]].
| Monadic <syntaxhighlight lang=apl inline>⊃</syntaxhighlight> is interpreted as [[Mix]] rather than [[First]].
|-  
|-  
| <syntaxhighlight lang=apl inline>Z←≡R</source>
| <syntaxhighlight lang=apl inline>Z←≡R</syntaxhighlight>
| Monadic <syntaxhighlight lang=apl inline>≡</source> returns a positive rather than a negative value, if its argument has non-uniform [[depth]].
| Monadic <syntaxhighlight lang=apl inline>≡</syntaxhighlight> returns a positive rather than a negative value, if its argument has non-uniform [[depth]].
|-
|-
| rowspan=2| <syntaxhighlight lang=apl inline>⎕ML=3</source>
| rowspan=2| <syntaxhighlight lang=apl inline>⎕ML=3</syntaxhighlight>
| <syntaxhighlight lang=apl inline>R←X⊂[K]Y</source>
| <syntaxhighlight lang=apl inline>R←X⊂[K]Y</syntaxhighlight>
| Dyadic <syntaxhighlight lang=apl inline>⊂</source> is interpreted as [[Partition]] (<syntaxhighlight lang=apl inline>⊆</source>) rather than [[Partitioned Enclose]].
| Dyadic <syntaxhighlight lang=apl inline>⊂</syntaxhighlight> is interpreted as [[Partition]] (<syntaxhighlight lang=apl inline>⊆</syntaxhighlight>) rather than [[Partitioned Enclose]].
|-  
|-  
| <syntaxhighlight lang=apl inline>⎕TC</source>
| <syntaxhighlight lang=apl inline>⎕TC</syntaxhighlight>
| The order of the elements of <syntaxhighlight lang=apl inline>⎕TC</source> is the same as in APL2.
| The order of the elements of <syntaxhighlight lang=apl inline>⎕TC</syntaxhighlight> 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 <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.
When migrating to Dyalog APL, the below drop-ins for the affected [[built-ins]] allow setting <syntaxhighlight lang=apl inline>⎕ML←1</syntaxhighlight> 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
|-
|-
| <syntaxhighlight lang=apl inline>⎕ML=0</source>
| <syntaxhighlight lang=apl inline>⎕ML=0</syntaxhighlight>
| <syntaxhighlight lang=apl>Epsilon←{×⎕NC'⍺':⍺∊⍵ ⋄ ⊃0⍴⊂⍵}</source>
| <syntaxhighlight lang=apl>Epsilon←{×⎕NC'⍺':⍺∊⍵ ⋄ ⊃0⍴⊂⍵}</syntaxhighlight>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '∊'⎕R'&' 'Epsilon'</source>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '∊'⎕R'&' 'Epsilon'</syntaxhighlight>
|-
|-
| <syntaxhighlight lang=apl inline>⎕ML=2</source>
| <syntaxhighlight lang=apl inline>⎕ML=2</syntaxhighlight>
| <syntaxhighlight lang=apl>
| <syntaxhighlight lang=apl>
UpArrow←{×⎕NC'⍺':⍺↑⍵ ⋄ ⊃⍵}
UpArrow←{×⎕NC'⍺':⍺↑⍵ ⋄ ⊃⍵}
RightShoe←{×⎕NC'⍺':⍺↑⍵ ⋄ ↑⍵}
RightShoe←{×⎕NC'⍺':⍺↑⍵ ⋄ ↑⍵}
EqualUnderbar←|≡
EqualUnderbar←|≡
</source>
</syntaxhighlight>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '↑' '⊃' '≡'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar'</source>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '↑' '⊃' '≡'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar'</syntaxhighlight>
|-
|-
| <syntaxhighlight lang=apl inline>⎕ML=3</source>
| <syntaxhighlight lang=apl inline>⎕ML=3</syntaxhighlight>
| <syntaxhighlight lang=apl>
| <syntaxhighlight lang=apl>
UpArrow←{×⎕NC'⍺':⍺↑⍵ ⋄ ⊃⍵}
UpArrow←{×⎕NC'⍺':⍺↑⍵ ⋄ ⊃⍵}
Line 61: Line 61:
LeftShoe←{×⎕NC'⍺':⍺⊆⍵ ⋄ ⊂⍵}
LeftShoe←{×⎕NC'⍺':⍺⊆⍵ ⋄ ⊂⍵}
quadTC←(⎕UCS 8 13 10)
quadTC←(⎕UCS 8 13 10)
</source>
</syntaxhighlight>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '↑' '⊃' '≡' '⊂' '⎕TC'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar' 'LeftShoe' ' quadTC'</source>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '↑' '⊃' '≡' '⊂' '⎕TC'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar' 'LeftShoe' ' quadTC'</syntaxhighlight>
|}
|}
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.
Line 71: Line 71:


{|class=wikitable
{|class=wikitable
| <syntaxhighlight lang=apl inline>⎕CS←1</source> || [[Strand notation|Stranding]] is done before [[bracket indexing]]
| <syntaxhighlight lang=apl inline>⎕CS←1</syntaxhighlight> || [[Strand notation|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←2</syntaxhighlight> || 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.
| <syntaxhighlight lang=apl inline>⎕CS←4</syntaxhighlight> || Format (<syntaxhighlight lang=apl inline>⍕</syntaxhighlight>) and default output uses the same width for all columns, rather than determining  the  width separately for  each column.
|}
|}


Revision as of 22:27, 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:

⎕ML=0 Z←∊R Monadic ∊ is interpreted as Type rather than Enlist.
⎕ML=1 Default behaviour
⎕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 ⊂ is interpreted as Partition (⊆) rather than Partitioned Enclose.
⎕TC The order of the elements of ⎕TC is the same as in APL2.

Work-arounds

When migrating to Dyalog APL, the below drop-ins for the affected built-ins allow setting ⎕ML←1 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
⎕ML=0 
Epsilon←{×⎕NC'⍺':⍺∊⍵ ⋄ ⊃0⍴⊂⍵}
 '''[^'']+''' '∊'⎕R'&' 'Epsilon'
⎕ML=2 
UpArrow←{×⎕NC'⍺':⍺↑⍵ ⋄ ⊃⍵}
RightShoe←{×⎕NC'⍺':⍺↑⍵ ⋄ ↑⍵}
EqualUnderbar←|≡
 '''[^'']+''' '↑' '⊃' '≡'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar'
⎕ML=3 
UpArrow←{×⎕NC'⍺':⍺↑⍵ ⋄ ⊃⍵}
RightShoe←{×⎕NC'⍺':⍺↑⍵ ⋄ ↑⍵}
EqualUnderbar←(|≡)
LeftShoe←{×⎕NC'⍺':⍺⊆⍵ ⋄ ⊂⍵}
quadTC←(⎕UCS 8 13 10)
 '''[^'']+''' '↑' '⊃' '≡' '⊂' '⎕TC'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar' 'LeftShoe' ' quadTC'

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:

⎕CS←1 Stranding is done before bracket indexing
⎕CS←2 The name class of an invalid name is 4 rather than ¯1.
⎕CS←4 Format (⍕) 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 (∇)
Retrieved from ‘https://aplwiki.com/index.php?title=Migration_level&oldid=9590’