otherStrand: Return the name of the opposite strand
Description
Return the name of the opposite strand
Usage
otherStrand(x)
Arguments
x
Character vector whose elements are "+" or "-".
Value
Character vector of same length as x, with strands reversed.
Details
This is a rather trivial convenience function.
An alternative would be to code strands with integers -1 and
+1, in which case the inversion would be a trivial builtin
operation. However, many genomic databases and input data files use
the character string / factor notation.