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R Programming for Bioinformatics
book

R Programming for Bioinformatics

by Robert Gentleman
July 2008
Intermediate to advanced content levelIntermediate to advanced
328 pages
10h 53m
English
Chapman and Hall/CRC
Content preview from R Programming for Bioinformatics
20 R Programming for Bioinformatics
2.2.4.3 Environments
An environment is a set of symbol-value pairs, where the value can be any R
object, and hence they are much like lists. Originally environments were used
for R’s internal evaluation model. They have slowly been exposed as an R
version of a hash table, or an associative array. The internal implementation
is in fact that of a hash table. The symbol is used to compute the hash index,
and the hash index is used to retrieve the value. In the code below, we create
an environment, create the symbol value pair that relates the symbol a to the
value 10 and then list the contents of the hash table.
> e1
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Publisher Resources

ISBN: 9781420063677