Introduction

This page contains instructions on how to read the Mathematica notebooks on this web site. If you do not already have Mathematica then you should download the freely available Mathematica Player to view the Mathematica notebooks.

Each paper is typeset as a Mathematica notebook, which is a hierarchically structured document where the section headings, subsection headings, text paragraphs, etc are logically nested cells which may be open or closed.  Note to experienced Mathematica users: Few of the Mathematica notebooks contain "Input" cells so there is not much executable Mathematica code as such in this archive, but future enhancements to this archive will change all of that.

Because Mathematica does not represent bitmap pictures in a compressed format I have decided to store all figures as separate GIF files, and to provide hyperlinks from the Mathematica notebook to the figures which will then display themselves in your browser. For most of the bitmaps this reduces the storage (and bandwidth) needed dramatically.

All hyperlinks that jump outside Mathematica notebooks, such as links to figures and links to other papers, are hardwired to the appropriate place in www.luttrell.org.uk/papers/. Unless you plan to do a lot of low-level text processing on the files it is pointless to download them in the hope that you can reproduce the full functionality of this archive on your local machine. When the archive has stabilised I will remove this restriction.

Instructions on Viewing Papers in the Archive

Example Paper

The instructions below use examples taken from the following paper:

OPEN Luttrell S P, 1994, A Bayesian analysis of self-organising maps, Neural Computation, vol. 6, no.5, pp. 767-794

Single-click the above "OPEN" hyperlink to open the Mathematica notebook containing this paper, which will display itself in a separate Mathematica (or MathReader) window, so you may view these instructions alongside the open Mathematica notebook. Warning: If you click on any of the "OPEN" hyperlinks to figures in the Mathematica notebook, then the figures will display themselves in the browser overwriting these instructions.

Various Types of Cells

An example of a closed section cell in the above Mathematica notebook looks like this:

The downward pointing arrow at the far right indicates that this cell is currently closed. It is highlighted here because the mouse has been single-clicked on the arrow. A double-click on this arrow causes the cell to open so that it looks like this:

The section cell contains the following cells within:

1. A text cell containing: "A self-organising map ... assortment of existing theories".
2. Six subsection cells that are currently closed.

Subsection cells (or any other type of cell containing cells nested within) may be opened in exactly the same way as section cells. If the subsection 1.3 cell above is opened it looks like this:

The subsection 1.3 cell contains the following cells within:

1. A text cell containing: "It has been noted ... encoding are related". There are various hyperlinks (highlighted in blue) in this text cell that link to other locations in this notebook. In other parts of this notebook you will find hyperlinks to equations, sections, etc within this notebook.
2. A figure cell containing an "OPEN" hyperlink to a figure.
3. A figure caption cell containing : "Assume that the input vector ... nearest neighbour encoding".
4. A text cell containing: "The minimum distortion prescription ... reference vectors emerged".

Single-click the hyperlink "Luttrell (1991a)" in the last text cell above to jump to the corresponding reference cell in this notebook which looks like this:

This cell contains the same type of "OPEN" hyperlink that was used for linking to a figure above, except that here it links to the paper "Luttrell S P, 1991a, Code vector density in topographic mappings: scalar case, IEEE Trans. NN, 2, 427-436".

Notes Section

Finally, the first section cell (i.e. "Notes") at the top of each Mathematica notebook contains notes that I made recording problems (and also their solutions if possible)  that arose during its creation. In each retypeset paper I made sure that the content is (as far as possible) the same as in the originally published paper, although the format is different. Where there are typographical errors (or more substantial errors) in the original papers I made appropriate changes to the content of the retypeset papers, and made a corresponding note in the "Notes" section detailing the changes that I made. I hope this pacifies the purists who might otherwise object to the slight lack of historical accuracy that this introduces into this archive. If you really want to look at the original documents then they are all in the public domain.

In the example Mathematica notebook the closed "Notes" section cell looks like this:

The corresponding open "Notes" section cell looks like this:

The format and content of the "Notes" section is somewhat haphazard. The various text cells in the "Notes" section explain both the global and local changes that I made during retypesetting, and also contain various hyperlinks that jump to parts of the notebook where I made changes.