Overview
Prevar2D constructs a PCF from data files that can hold any number of samples provided enough memory is available on the computer. This pair comparison file contains the number of pairs calculated, the sorted list of pairs, and the name of the data file from which the PCF was constructed.
A PCF can be constructed with theRun ! menu item, which is enabled after the user has validated the “ettings” dialog box displayed with theSettings | XY-Coordinates… menu item. This menu item is enabled when a data file [6.1] has been read into memory (use the File | Open Data File… menu item).
Prevar2D builds a pair comparison file in two steps:
1. All pairs belonging to the active subset [3.4] are first written to a binary file.
2. This binary file is then loaded into memory and pairs are sorted by increasing distance using the quicksort algorithm [Press et al., 1992]. At this stage an error message can be displayed if the memory available on the system is not sufficient to load the binary file. A possible solution is to increase the swapping space used by Windows.
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References
Englund, E. & Sparks, A., “Geo-EAS 1.2.1 User’s Guide,” US-EPA Report #600/8-91/008, EPA-EMSL, Las Vegas, NV, 1991.
Froidevaux, R ., “Geostatistical Toolbox Primer, version 1.30,” FSS International,Chemin de Drize 10, 1256 Troinex, Switzerland, 1990.
Microsoft Corporation, “Microsoft Windows 3.1 — Guide to Programming”, Microsoft Press, Redmont, WA, 1992.
Press, W. H., Teukolsky, S. A., Vetterling, W. T. & Flannery, B. P. ., “Numerical Recipes in C - The Art of Scientific Computing – Second Edition,” Cambridge University Press, Cambridge, 1992.
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© 1996 Springer-Verlag
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Pannatier, Y. (1996). Construction of a Pair Comparison File (PCF) with Prevar2D. In: Variowin. Statistics and Computing. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-2392-4_3
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DOI: https://doi.org/10.1007/978-1-4612-2392-4_3
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