A spreadsheet is a rectangular table (or grid) of information, often
financial information. The word came from "spread" in its sense of a newspaper or magazine item (text and/or graphics) that covers two facing pages, extending across the center fold and treating the two pages as one large one. The compound word "spread-sheet" came to mean the format used to present
bookkeeping ledgers—with columns for categories of expenditures across the top, invoices listed down the left margin, and the amount of each payment in the cell where its row and column intersect—which were traditionally a "spread" across facing pages of a bound ledger (book for keeping accounting records) or on oversized sheets of paper ruled into rows and columns in that format and approximately twice as wide as ordinary paper.
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<
application,
tool> (Or rarely "worksheet") A type of
application program which manipulates numerical and string data in rows and columns of cells. The value in a cell can be calculated from a formula which can involve other cells. A value is recalculated automatically whenever a value on which it depends changes. Different cells may be displayed with different formats.
Some spreadsheet support three-dimensional matrices and cyclic references which lead to iterative calculation.
An essential feature of a spreadsheet is the copy function (often using
drag-and-drop). A rectangular area may be copied to another which is a multiple of its size. References between cells may be either absolute or relative in either their horizontal or vertical index. All copies of an absolute reference will refer to the same row, column or cell whereas a relative reference refers to a cell with a given offset from the current cell.
Many spreadsheets have a "What-if" feature. The user gives desired end conditions and assigns several input cells to be automatically varied. An area of the spreadsheet is assigned to show the result of various combinations of input values.
Spreadsheets usually incorporate a
macro language, which enables third-party writing of worksheet applications for commercial purposes.
In the 1970s, a
screen editor based calculation program called
Visi-Calc was introduced. It was probably the first commercial spreadsheet program. Soon
Lotus Development Corporation released the more sophisticated
Lotus 1-2-3. Clones appeared, (for example
VP-Planner from
Paperback Software with
CGA graphics,
Quattro from
Borland) but Lotus maintained its position with world-wide marketing and support - and lawyers! For example, Borland was forced to abandon its Lotus-like
pop-up menu.
While still developing 1-2-3, Lotus introduced
Symphony, which had simultaneously active windows for the spreadsheet, graphs and a
word processor.
Microsoft produced
MultiPlan for the
Macintosh, which was followed by
Excel for Macintosh, long before
Microsoft Windows was developed.
When
Microsoft Windows arrived Lotus was still producing the
text-based 1-2-3 and Symphony. Meanwhile,
Microsoft launched its
Excel spreadsheet with interactive graphics, graphic charcters, mouse support and
cut-and-paste to and from other Windows applications. To compete with Windows spreadsheets, Lotus launched its
Allways add-on for 1-2-3 - a post-processor that produced Windows-quality graphic characters on screen and printer. The release of Lotus 1-2-3 for Windows was late, slow and buggy.
Today, Microsoft, Lotus, Borland and many other companies offer Windows-based spreadsheet programs.
The main end-users of spreadsheets are business and science.
Spreadsheets are an example of a non-algorithmic programming language.
[Dates?]
(1995-03-28)
A computer program that organizes numerical data into rows and columns on a terminal screen, for calculating and making adjustments based on new data.
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