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It is analogous to an array of variables in a conventional computer program although certain unchanging values, once entered, could be considered, by the same analogy, constants.
In most implementations, many worksheets may be located within a single spreadsheet. A worksheet is simply a subset of the spreadsheet divided for the sake of clarity. Functionally, the spreadsheet operates as a whole and all cells operate as global variables within the spreadsheet each variable having 'read' access only except its own containing cell.
A cell may contain a value or a formulaor it may simply be left empty. Values[ edit ] A value can be entered from the computer keyboard by directly typing into the cell itself.
Alternatively, a value can be based on a formula see belowwhich might perform a calculation, display the current date or time, or retrieve external data such as a stock quote or a database value. The Spreadsheet Value Rule Computer scientist Alan Kay used the term value rule to summarize a spreadsheet's operation: There are no 'side effects' to calculating a formula: There is no natural mechanism for permanently modifying the contents of a cell unless the user manually modifies the cell's contents.
In the context of programming languages, this yields a limited form of first-order functional programming. Some earlier spreadsheets required a manual request to recalculate, since recalculation of large or complex spreadsheets often reduced data entry speed.
Many modern spreadsheets still retain this option. Recalculation generally requires that there are no circular dependencies in a spreadsheet. A dependency graph is a graph that has a vertex for each object to be updated, and an edge connecting two objects whenever one of them needs to be updated earlier than the other.
Dependency graphs without circular dependencies form directed acyclic graphsrepresentations of partial orderings in this case, across a spreadsheet that can be relied upon to give a definite result.
For shared, Web-based spreadsheets, it applies to "immediately" updating cells another user has updated. All dependent cells must be updated also. Locked cell[ edit ] Once entered, selected cells or the entire spreadsheet can optionally be "locked" to prevent accidental overwriting.
Even though individual cells are marked as locked, the spreadsheet data are not protected until the feature is activated in the file preferences. Data format[ edit ] A cell or range can optionally be defined to specify how the value is displayed. The cell contents are not changed by this format, only the displayed value.
Some cell formats such as "numeric" or " currency " can also specify the number of decimal places.Aug 16, · Responding personally to an article is usually the start of any analysis of writing, so it is a good first paper type to write.
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