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Marc Stadelmann


Publications by Marc Stadelmann (bibliography)

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Stadelmann, Marc (1993): A Spreadsheet Based on Constraints. In: Hudson, Scott E., Pausch, Randy, Zanden, Brad Vander and Foley, James D. (eds.) Proceedings of the 6th annual ACM symposium on User interface software and technology 1993, Atlanta, Georgia, United States. pp. 217-224. http://www.acm.org/pubs/articles/proceedings/uist/168642/p217-stadelmann/p217-stadelmann.pdf

Constraints allow the user to declare relationships among objects and let the system maintain and satisfy these relationships. This paper is concerned with the design of a spreadsheet based on constraints. Instead of formulas, we let the user enter numerical constraints, such as >, < and = over the real values in the cells of the spreadsheet. Recalculating the spreadsheet then means (1) checking whether the given cell-values satisfy all constraints and (2) finding values for cells that satisfy the constraints. After a brief presentation of the advantages of a constraint-based spreadsheet, we describe the design of its user-interface. The concept of constraints over cells is extended to constraints over vectors and matrices of cells. We introduce a language for constraints over vectors and matrices of a two-dimensional spreadsheet and define several operations on these vectors. The described new spreadsheet has been implemented and we provide a brief overview of this effort before discussing future work and giving some concluding remarks.

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