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APL/700 was an APL implementation by Burroughs Corporation for their 700 series of mainframe computers. The language was mostly identical to that of APL.SV and its successors, but differed in a few details:[1]

  • The statement separator was a semicolon (;) rather than the conventional diamond and statements in such a so-called list were evaluated from right to left, much as if the semicolon was the Left identity function ().
  • In primitive pairs with both a last and first axis version, for example / vs and vs , the first axis version would use the function axis syntax to indicate the applicable axis counted from the last axis rather than from the first axis. For example [1] was equivalent to just like [1] was equivalent to .
  • While in general reduction using scalar functions were supported by for arrays of a compatible data type (numeric or character), =/ and / did not support character data.
  • APL/700 included modified assignment, but the pass-through value was the new value of the updated array.
  • More set functions were included than even modern APLs have. In particular and were Subset and Superset, though not strict subset and superset, but rather as {/(,)(,)} and {/(,)(,)}. All the set functions except for Membership were defined in terms of the ravel of the arguments, and thus always returned a vector. Furthermore, Union (), Intersection (), and Set difference (~) returned only Unique elements, that is, a vector with no duplicates.
  • Format allowed an advanced formatting specification through a character left argument.
  • Many additional quad names were available, including a set of two-letter system functions with all the combinations of S/R/Q (for Stop, Reset, Query) with T/S/M (Trace, Stop, Monitor), and character constants for control characters (⎕B, ⎕L, ⎕R, ⎕T, and ⎕N for Backspace, Linefeed, Return, Tab, and Null), the digits ⎕D, and the alphabet (⎕A).
  • In a manner similar to, but more extensively than the much later APLX, APL/700 had primitive functions for file operations. In addition to and for read and write operations (as in APLX), it supported the following:
    • to create, rename and change password for files, and for deleting files.
    • and were used to read+pop and append components to the beginning and end of a file, respectively.
    • Equivalents of normal primitive functions for operations on component of files as if they were elements of a vectors: and acted like Take and Drop ( and ). would Reverse and Rotate (). and were Compress and Expand (/ and \).
    • and and were used to hold, free, and relase a file.
    • and returned maps for non-null and null components, respectively.
    • provided meta information about a file or the file system.


  1. Burroughs Corporation. User Reference Manual (5000813). 1975.
APL dialects [edit]
Maintained APL+Win (APL*PLUS) ∙ APL2APL64APL\ivAprilCo-dfnsDyalog APLdzaima/APLExtended Dyalog APLGNU APLKAPNARS2000
Historical Iverson notationA Programming LanguageA+ (A) ∙ APL#APL.68000APL.SVAPLXAPL\1130APL\3000APL\360APL/700NARSngn/aplopenAPLRowanSAXSHARP APLVisualAPL (APLNext) ∙ VS APLYork APL
Derivatives AHPLBQNELIIIvyJJellyK (Q, KDB+) ∙ NialRAD