Algorithms And Data Structures

Download e-book for iPad: Report on the algorithmic language Algol 68 by Barry J. Mailloux, Adriaan van van Wijngaarden

By Barry J. Mailloux, Adriaan van van Wijngaarden

Show description

Read or Download Report on the algorithmic language Algol 68 PDF

Best algorithms and data structures books

Download e-book for iPad: Parallel algorithms for regular architectures: meshes and by Quentin F. Miller Russ;Stout

Parallel-Algorithms for normal Architectures is the 1st publication to pay attention solely on algorithms and paradigms for programming parallel desktops resembling the hypercube, mesh, pyramid, and mesh-of-trees. Algorithms are given to resolve basic initiatives equivalent to sorting and matrix operations, in addition to difficulties within the box of photograph processing, graph idea, and computational geometry.

Reporting District-Level NAEP Data - download pdf or read online

The nationwide evaluation of schooling development (NAEP) has earned a name as one of many nation's most sensible measures of scholar success in key topic parts. because its inception in 1969, NAEP has summarized educational functionality for the country as an entire and, starting in 1990, for the person states.

Extra info for Report on the algorithmic language Algol 68

Example text

Another instance when recursion is invaluable is when we want to describe a backtracking procedure. But for now we will content ourselves with examining some simple, iterative programs and show how to eliminate the iteration statements and replace them by recursion. This may sound strange, but the objective is not to show that the result is simpler to understand nor more efficient to execute. The main purpose is to make one more familiar with the execution of a recursive procedure. Suppose we start with the sorting algorithm presented in this section.

Let us write out the algorithm in full. 3 SPARSE MATRICES // A is a matrix represented in sparse form// // B is set to be its transpose// 1 (m,n,t) (A(0,l),A(0,2),A(0,3)) 2 (B(0,1),B(0,2),B(0,3)) 3 if t 4 q 5 for col 1 to n do //transpose by columns// 6 for p 1 to t do //for all nonzero terms do// (n,m,t) 0 then return 1 //check for zero matrix// //q is position of next term in B// if A(p,2) = col 7 //correct column// then [(B(q,1),B(q,2),B(q,3)) 8 //insert next term of B// 9 (A(p,2),A(p,1),A(p,3)) 10 11 12 q q + 1] end end 13 end TRANSPOSE The above algorithm makes use of (lines 1, 2, 8 and 9) the vector replacement statement of SPARKS.

T(j) is maintained so that it is always the position in B where the next element in row j is to be inserted. There are four loops in FAST--TRANSPOSE which are executed n, t, n - 1, and t times respectively. Each iteration of the loops takes only a constant amount of time, so the order of magnitude is O(n + t). The computing time of O(n + t) becomes O(nm) when t is of the order of nm. This is the same as when two dimensional arrays were in use. However, the constant factor associated with FAST__TRANSPOSE is bigger than that for the array algorithm.

Download PDF sample

Report on the algorithmic language Algol 68 by Barry J. Mailloux, Adriaan van van Wijngaarden


by William
4.3

Rated 4.29 of 5 – based on 5 votes