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By Graeme Donald Robertson

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Puns or what?! It is of interest to note that the name Dyalog originates from a joint project between Dyadic and Zilog whose outcome was the first version of the Dyalog APL interpreter in 1982. :-) A second operator with irregular syntax is the axis operator that surrounds its numeric “right” operand with brackets. This, like indexing, does not follow the usual single token nomenclature which is assumed in rules 1 and 2. ) • Experiment with ”>n,2@0$7          ”>n,2@0$7          and 0$7>n,2@0$7                   0$7>n,2@0$7                   to see how the axis operator modifies the axis to which its left operand applies.

E. irregular use of tokens vis-à-vis rules 1 and 2) in any of the preceding lessons? Is  a function or an operator? Remember, you' re not really supposed to encounter anything irrational in APL notation! Grammar: Core APL, here called APL 1, has an extremely simple and elegant grammar. This grammar still forms the unchanged core of modern APLs, which adhere quite strictly to ISO Standard 8485:1989. Later generations, APL 2 and APL 3, each introduce a number of new rules of grammar making the underlying parsers considerably more complicated, and consequently, lines of code harder to read with confidence.

G. ) For example, the two symbols jot (’) and dot are used in combination to represent the outerproduct operator. This operator derives a dyadic function which conceptually takes each element of its left argument and combines it with each and every element in the right argument according to the dyadic (right) operand. •        Enter these two examples and find an example of another useful operand. ž ’ ž                                           ‹ DGGLWLRQ WDEOH 30 A Practical Introduction to APL1 & APL2 ž                             ’¹ ž                      ‹ PXOWLSOLFDWLRQ WDEOH Notice the appearance of the comment symbol (‹) which can be used to add comments at the end of any executable line of APL.

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