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By Iliano Cervesato (auth.)
This ebook describes contemporary multidisciplinary learn on the confluence of the fields of common sense programming, database idea and human-computer interplay. The objective of this attempt was once to boost the root of a deductive spreadsheet, a consumer productiveness program that enables clients with no formal education in machine technological know-how to make judgements approximately common facts within the comparable easy manner they at the moment use spreadsheets to make judgements approximately numerical info. the result's a sublime layout supported through the latest advancements within the above disciplines.
The first 1/2 the e-book specializes in the deductive engine that underlies this software, the principles that clients don't see. After giving a mathematical version of conventional spreadsheet functions, we expand them with operators to accomplish a few relational projects, just like the person view of a database yet in a spreadsheet context. Expressing this extension in a good judgment programming framework is a traditional step in the direction of giving it strong deductive features. the second one 1/2 the ebook bargains with the person interface, the a part of the appliance with which the person really interacts. We assessment the weather of the graphical consumer interface of conventional spreadsheet purposes and describe sensible methodologies for designing consumer interfaces borrowed from the sphere of cognitive psychology. We then suggest a layout that conservatively integrates mechanisms for a consumer to use the recent deductive features. this is often by means of the result of a few initial usability experiments.
The booklet will attract researchers and practitioners within the a number of components underlying this paintings. Researchers won't simply locate fascinating new advancements of their domain names, yet also will methods to in attaining a multidisciplinary concentration. Practitioners will locate totally constructed strategies to various difficulties that aren't simply solvable utilizing conventional spreadsheet applications.
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Additional resources for The Deductive Spreadsheet
Sample text
4. A scalar or array formula may embed a logical formula, subject to the constraint that no other requirement is violated. 2 Cognitive Requirements This class of requirements has to do with the general experience of the user during his or her daily interactions with a tool. Therefore, issues that are addressed include the manner in which the graphical interface provides access to the underlying functionalities, the familiarity with respect to similar applications, and the effort involved in using the tool and discovering new features.
Therefore, this book designs the deductive spreadsheet as an extension of a traditional spreadsheet such as Microsoft Excel, Google Spreadsheet, or OpenOffice and LibreOffice Calc with powerful deductive capabilities that can assist an end-user with the process of making decisions and manipulating both symbolic and numerical data. 4 Approach 11 • Internally, this extension takes the form of a logic programming language with a bottom-up evaluation strategy. The deductive and traditional functionalities are smoothly integrated, so that logical reasoning can apply to cells with calculated values, and formulas can refer to cells produced by logical inference.
Recursion is now part of SQL, the standard database query language. There is clearly much inspiration that the design of the deductive spreadsheet can take from databases, and in particular deductive databases. It would be incorrect, however, to think that deductive databases already implement all the requirements of the deductive spreadsheet. Indeed, a database management system is primarily meant to provide efficient access to large amounts of data that necessarily reside on secondary storage.