Download A practical introduction to APL-1 & APL-2 by Graeme Donald Robertson PDF

By Graeme Donald Robertson

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Extra info for A practical introduction to APL-1 & APL-2

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Apl * * * * * 48 A Practical Introduction to APL1 & APL2 FEEDBACK FORM Date _____________________ Instructor _____________________ Name _____________________ Course Name _____________________ eMail _____________________ Location _____________________ Please indicate your view of the following: poor 1 2 3 4 5 excellent Location & Facilities Course Content Course Material Instructor’ s Knowledge How useful was the course to your role? Could any improvements be made to the course? Comments Give this form to your tutor, or send to ROBERTSON (Publishing).

Hint: Do this in two distinct steps. • Write a function which trims the leading (and trailing) spaces from a character vector. This function is very useful. What might you consider when choosing an appropriate function name? • Write a function 8&\$6( which efficiently converts nested character arrays to upper case letters. • Write a function, \$)7(5, which returns a boolean scalar signifying whether or not the left argument (date) is temporaneously after the right argument (date). :) • Write scalar dyadic functions, /&0 and +&), which return the lowest common multiple (the smallest number which is exactly divisible by each of two numbers) and the highest common factor (or greatest common divisor) - the largest number which divides each exactly.

This opens up a whole new heterogeneous world! • Execute the line below a few times and examine the structure of A each time. \$>@f}\$ • Reshape () and rotate () a vector of vectors (a list of lists): 9(&9(&f 127 \$ '580 :\$6 +(\$5' Is 9(&9(& a vector of vectors? 37 A Practical Introduction to APL1 & APL2 Vector Notation. Rule 3: A series of two or more adjacent expressions results in a vector whose elements are the enclosed arrays resulting from each expression. (This is fortified with an eight level hierarchy of binding strengths.