Download APL2 in Depth by Norman D. Thomson, Raymond P. Polivka (auth.) PDF
By Norman D. Thomson, Raymond P. Polivka (auth.)
This ebook is designed for individuals with a operating wisdom of APL who want to raise their fluency within the wide variety of additional amenities provided through second-generation APL items. even though the first product in view is IBM's APL2 as applied on mainframe, computing device and RS/6000, the language fea tures coated percentage huge universal flooring with APL *PLUS II and Oyalog APL. it is a ebook approximately talents instead of wisdom, and an acquaintance with a few number of APL at the reader's half is believed from the beginning. it's designed to be learn as a continual textual content, interspersed with exer cises designed to offer steadily deeper perception into what the authors conceive because the beneficial properties that have the best impression on programming strategies. it is going to even be compatible as a text-book for a moment path in APL2, even supposing event means that so much programming language studying is now by means of self learn, in order that this quantity is prone to offer follow-up interpreting to extra straightforward texts reminiscent of "APL2 at a look" via Brown, Pakin and Polivka. fabric is mentioned extra informally than in a language handbook - during this ebook textual bulk is in share to hassle and value instead of to the level of technical info. certainly, a few APL2 extensions should not coated in any respect the place the technicalities pose no nice difficulties in realizing and will be with ease assimilated from the language manuals.
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Pad with the default format control character (OFC[3J). pad with blanks. 20 The digits '1','2','3' and '4' form a group which handle controlled and floating decorators. Decorators may appear either to the left or to the right of their number or to both left and right, in which case two digits from this group should be used which are interpreted left then right. The meanings of the digits are: '1' '2' '3' '4' : apply a floating decorator : apply a floating decorator : apply a floating decorator : cancel '1', '2' or '3' on the to negative numbers only.
ICHARSI I r+-, +ABI ICDI I r+ I i-. I 11 2 3 41 16 L-J L~ CHARS 2 10M11 :;1 10M11 Consider the following attempts to extract the character H from the matrix M11: 26 APL2 IN DEPTH 201 10M11 RANK ERROR 201 10M11 /\/\ 20::>1 10M11 H These show that repeated applications of indexing alone are not sufficient to extract a nested item. The cause of this apparent dilemma stems from the shape of the result of indexing. Informally the rule is the shape of the result is the catenation of the shapes of the indices.
J 1 L€ ______ L€ ________________ ~ ~ the second item is doubly enclosed so 2 3:::>V is a RANK ERROR. " In general it is not wise to mix vector notation and explicit enclosure in the same statement since an extra level of nesting may inadvertently be created. 2 First First (t) is the monadic function which uses the same symbol as take but its semantics are quite different. First penetrates the first level of structure and produces the first item there, as opposed to indexing which does not penetrate.