bio-0.4.6: A bioinformatics librarySource codeContentsIndex
Bio.Location.Position
Contents
Sequence positions
Manipulating positions
Extracting sequences
Displaying positions
Description

Data type for a sequence position.

Zero-based Offset / Int64 indices are used throughout, to facilitate direct use of indexing functions on SeqData.

Synopsis
data Pos = Pos {
offset :: !Offset
strand :: !Strand
}
slide :: Pos -> Offset -> Pos
seqNt :: (Error e, MonadError e m) => SeqData -> Pos -> m Char
seqNtPadded :: SeqData -> Pos -> Char
display :: Pos -> String
Sequence positions
data Pos Source
Position in a sequence
Constructors
Pos
offset :: !Offset0-based index of the position
strand :: !StrandStrand of the position
show/hide Instances
Manipulating positions
slide :: Pos -> Offset -> PosSource

Returns a position resulting from sliding the original position along the sequence by a specified offset. A positive offset will move the position away from the 5' end of the forward stand of the sequence regardless of the strand of the position itself. Thus,

 slide (revCompl pos) off == revCompl (slide pos off)
Extracting sequences
seqNt :: (Error e, MonadError e m) => SeqData -> Pos -> m CharSource
Extract the nucleotide at a specific sequence position. If the position lies outside the bounds of the sequence, an error results.
seqNtPadded :: SeqData -> Pos -> CharSource

As seqNt, extract the nucleotide at a specific sequence position, but return N when the position lies outside the bounds of the sequence.

 seqNtPadded sequ pos == (either 'N' id . seqNt sequ) pos
Displaying positions
display :: Pos -> StringSource
Display a human-friendly, zero-based representation of a sequence position.
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