Download APL2 in Depth by Norman D. Thomson, Raymond P. Polivka (auth.) PDF

By Norman D. Thomson, Raymond P. Polivka (auth.)

This booklet is designed for individuals with a operating wisdom of APL who wish to bring up their fluency within the wide selection of additional amenities provided by means of second-generation APL items. even supposing the first product in view is IBM's APL2 as carried out on mainframe, computer and RS/6000, the language fea­ tures lined percentage huge universal flooring with APL *PLUS II and Oyalog APL. it is a e-book 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 continuing textual content, interspersed with exer­ cises designed to offer steadily deeper perception into what the authors conceive because the positive factors that have the best effect on programming strategies. it is going to even be compatible as a text-book for a moment direction in APL2, even supposing adventure means that so much programming language studying is now by way of self­ examine, in order that this quantity is likely to offer follow-up interpreting to extra hassle-free texts equivalent to "APL2 at a look" through Brown, Pakin and Polivka. fabric is mentioned extra informally than in a language handbook - during this publication textual bulk is in share to hassle and value instead of to the level of technical info. certainly, a few APL2 extensions aren't lined in any respect the place the technicalities pose no nice difficulties in figuring out and will be quite simply assimilated from the language manuals.

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2D [1]M b. c. d. 2D[2]M (c2 1lD[1]M (c21lD[2]M 6. Given A+3 4 Sp 160 write expressions involving D to a. extract the second plane; b. extract the third column from each plane; c. extract the third column from the second plane; d. extract the item in the fourth row, third column, and second plane. 7. a. g. 'SPARE ME A DIME', into a vector of words. b. e. a matrix in which each row is a name, and the shorter names are padded on the right with blanks) into a vector of names, each with no trailing blanks.

Selective assignment allows much greater generality in updating parts of arrays. 1 Vector Assignment Vector assignment allows the decomposition of the assignment target into components each of which can be assigned individually. The general structure of expressions using selective assignment is (list of names) + value(s) For example: (A B)+(3 3pt9)('XYZ') 1 4 7 XYZ A 2 5 8 B 3 6 9 1. 2 Selective Assignment One form of selective assignment has always been present in APL namely assignment by index: M+3 3p\9 M[2;2 3]+100 M 2 3 4 100 100 7 8 9 The ability to assign to just part of an array is greatly extended in APL2.

With expressions: 4p 112 determine the value and shape of the following a. 2D [1]M b. c. d. 2D[2]M (c2 1lD[1]M (c21lD[2]M 6. Given A+3 4 Sp 160 write expressions involving D to a. extract the second plane; b. extract the third column from each plane; c. extract the third column from the second plane; d. extract the item in the fourth row, third column, and second plane. 7. a. g. 'SPARE ME A DIME', into a vector of words. b. e. a matrix in which each row is a name, and the shorter names are padded on the right with blanks) into a vector of names, each with no trailing blanks.

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