What means "String"
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| − | In computer science, a string is a set of characters. This may be composed of | + | In computer science, a string is a set of characters. This may be composed of letters, symbols or numbers. In GIS context, the term ''string'' is often used as opposed to ''numbers''. |
E.g., a [[nodata value]] in a raster-map may be defined as a string (“nan” or “NA”) or as a number (e.g. “-9999“, which is common in [[ASCII]] files). | E.g., a [[nodata value]] in a raster-map may be defined as a string (“nan” or “NA”) or as a number (e.g. “-9999“, which is common in [[ASCII]] files). | ||
Revision as of 11:30, 18 February 2011
In computer science, a string is a set of characters. This may be composed of letters, symbols or numbers. In GIS context, the term string is often used as opposed to numbers.
E.g., a nodata value in a raster-map may be defined as a string (“nan” or “NA”) or as a number (e.g. “-9999“, which is common in ASCII files).
Note that a string may also contain or completely consist of numbers, but these are not recognized as numbers by the computer; which practically means that you can not use them in a mathematic way, e.g. for solving calculations.
See also
- String in Wikipedia
