The structure of the Album is twodimensional and permits various paths through the material. Contents shows parts including algorithms having the same orientation, usually they tackle the same problem. There is one special part - techniques, too. It includes general useful methods of accomplishing a desired aim as removal recursion, construction of test data sets, creating of universal routines etc. (Recipe) Index is a list of algorithms sorted in alphabetical order. Descriptions of algorithms contain further reference in the section 'connections'. The Album is completed by the reflections on programming, see the chapter Reflexio

Rexx code tends to run slowly. The key to a fast scripts are the efficient algorithms. I have been collecting such algorithms. It isn't a trivial job to translate algorithms from various pseudocodes or programming languages as Ada, ALGOL, BASIC, C, FORTRAN, Modula, Pascal, PL/1, into the useful code in the Rexx language.

The Album may be useful as a reference, since it contains an organized collection of algorithms. All of this are expressed in the Rexx language. You can try copy and paste this routines from browser into an editor, direct into a concrete program (in detail: Technique: Universal Unit). ATTENTION! Please, when you see the following fragment on the two lines, then you have to decrease font in your browser (Thanks Doug Rickman doug@hotrocks.msfc.nasa.gov from NASA for this warning).

The Album can be useful in a college course on algorithms as well in beginning courses of the programming in the Rexx language. The Album is an experiment: I use the Rexx language in an explanations and descriptions of algorithms, too. Hence I say things like "Its time complexity is FORMAT(3*N/2-2,,0) comparisons" or "pattern P. occurs with shift S in text T. if 0<=S<=N-M and if T.SpJ=P.J, where SpJ indicates S+J, for J=1,...,M". The Album proves that the Rexx language is the suitable vehicle for presentation a set useful algorithms in clean, succint, and uniform code.

Note - We therefore reserve the special symbol lgN to denote a logarithm with base 2.

17th September 2001
Short circuiting in Rexx?

12th September 2001
Test environment by Walter Pachl ...

24th August 2001
I finished rewriting and repairing of the whole album

3th August 2001
New solution 3_1 in Technique: Universal unit by Tobias Herp

28th July 2001
Offline version of my www pages with Album of Algorithms and Techniques is available on CD of OS2.cz as freeware

1st July 2001
P+n trick by Walter Pachl added in Reflexio

18th June 2001
Walter Pachl repaired the last digits in the V variable in LN2 and PICONST functions.

12th March 2001
The functions for calculating of the area of a triangle - numerically unstable HERON and numerically stable ATRIAN.

4th March 2001
After reading Kahan's Mathematics Written in Sand I changed the function REPOWER:

if P = "" then P = 9; P = P + 4; numeric digits P

See Reflexio.

22nd February 2001
Danny De Wilde sent me mail with question How to compute function real power? It inspired me to creating the function REPOWER.

1st December 2003
James Barbetti sent me subprogram HEAPSORT_RADIX3 in Visual Basic.