New PDF release: APL Programs for the Mathematics Classroom

By Norman D. Thomson

ISBN-10: 0387970029

ISBN-13: 9780387970028

ISBN-10: 1461236681

ISBN-13: 9781461236689

The notion for this booklet grew out of proposals on the APL86 con­ ference in Manchester which resulted in the initiation of the I-APL (International APL) undertaking, and during it to the provision of an interpreter which might convey the benefits of APL in the technique of mammoth numbers of college young ones and their lecturers. the incentive is that when university lecturers have glimpsed the probabilities, there'll be a spot for an "ideas" publication of brief courses with a view to let important algorithms to be introduced speedily into school room use, and even perhaps to be written and constructed in entrance of the category. A test of the contents will express how the conciseness of APL makes it attainable to deal with an immense diversity of issues in a small variety of pages. there's certainly a level of idiosyncrasy within the number of issues - the choice i've got made displays algo­ rithms that have both proved worthy in genuine paintings, or that have stuck my mind's eye as applicants for demonstrating the worth of APL as a mathematical notation. the place applicable, notes at the courses are meant to teach the naturalness with which APL bargains with the maths involved, and to estab­ lish that APL isn't, as is usually intended, an unreadable lan­ guage written in a extraordinary personality set.

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It is also convenient to use the functions WITHOUT and REMDUP which are defined in Appendix 2. g. U+l10 A+15 3. g. 7. Polynomial Coefficients from Roots The following function gives the coefficients of in descending power order of the polynomial whose roots are given by the items of vector R. *T+-ALLS pR Examples: Coefficients of (x-lP and (x-I)(x-2)(x-3). PCOFS 1 1 1 133 1 3. Algebra and Sets 37 PCOFS 1 2 3 1 6 11 6 This function demonstrates the use of inner and outer products to good advantage.

Confirm the following: (i) If A = BC in the matrix multiplication sense, then (1fIB) +. xA and A+. xlilC are equal to C and B respectively. 3. xA (See Appendix 2 for UNIT). 1. Determinants The determinant of a square matrix R is given by the following algorithm which obtains the result as the product of the successive topmost leading diagonal items which appear as the original matrix is reduced by progressively replacing it with the outer product of its leading row and column divided by the current topmost diagonal element.

L is the polynomial degree and R is a table such as T with (O,x) appended as first column. APL Programs for the Mathematics Classroom 54 NEV : (-f(e1 OFF(L-1)NEV R)xT-R[2;1J) +-fT+L OFF 1~R[2;J : L=O : 1~R[1;J OFF : (0 ,-LH (LR) , [. 5JR Example : Find the 2nd degree polynomial interpolation for x = n/6 in the table T above. 5 In practice, it is more useful to have an algorithm which carries on increasing the degree of the interpolation until two successive estimates agree within a specified tolerance.

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APL Programs for the Mathematics Classroom by Norman D. Thomson


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