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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
30 R Programming for Bioinformatics
extract entries one, three and five from a vector, one can use the approach
demonstrated in the next code chunk.
> x = 11:20
> x[c(1, 3, 5)]
[1] 11 13 15
The general rules for subsetting with positive indices are:
A subscript consisting of a vector of positive integer values is taken to
indicate a set of indexes to be extracted.
A subscript that is larger than the length of the vector being subsetted
pro duces an NA in the returned value.
Subscripts that are zero are ignored and produce no corresponding values
in the result.
Subscripts that are NA produce an NA in the result.
If the subscript vector is of length zero,
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Publisher Resources

ISBN: 9781420063677