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

By Graeme Donald Robertson

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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.

We have seen how it is possible to write a looping function that will add up all the elements in a vector. This should be replaced by the derived function plus reduce (or sum) for reasons of both elegance and efficiency. ). In APL one attempts to apply some function to the given arguments to obtain immediately the desired result. This is not always possible; often intermediate results are needed. If so, the problem is broken down into sub-problems and a solution to each sub-problem is then sought through the application of some function to an argument or arguments to give an intermediate result.

Hence check the meaning of >@0$7    and >@0$7    • What might the following line of code be doing? 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.

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