Description Details The DNA alphabet Constructor-like functions and generics Accessor methods Display Author(s) See Also Examples
A DNAString object allows efficient storage and manipulation of a long DNA sequence.
The DNAString class is a direct XString subclass (with no additional slot). Therefore all functions and methods described in the XString man page also work with a DNAString object (inheritance).
Unlike the BString container that allows storage of any single string (based on a single-byte character set) the DNAString container can only store a string based on the DNA alphabet (see below). In addition, the letters stored in a DNAString object are encoded in a way that optimizes fast search algorithms.
This alphabet contains all letters from the
IUPAC Extended Genetic Alphabet (see ?IUPAC_CODE_MAP
)
plus "-"
(the gap letter), "+"
(the hard
masking letter), and "."
(the not a letter or not
available letter).
It is stored in the DNA_ALPHABET
predefined constant (character
vector).
The alphabet()
function returns DNA_ALPHABET
when
applied to a DNAString object.
In the code snippet below,
x
can be a single string (character vector of length 1),
a BString object or an RNAString object.
DNAString(x="", start=1, nchar=NA)
:
Tries to convert x
into a DNAString object by reading
nchar
letters starting at position start
in x
.
In the code snippet below, x
is a DNAString object.
alphabet(x, baseOnly=FALSE)
:
If x
is a DNAString object, then return the DNA
alphabet (see above).
See the corresponding man pages when x
is a
BString, RNAString or AAString object.
The letters in a DNAString object are colored when displayed by the
show()
method. Set global option Biostrings.coloring
to FALSE to turn off this coloring.
H. Pag<c3><a8>s
The DNAStringSet class to represent a collection of DNAString objects.
The XString and RNAString classes.
reverseComplement
alphabetFrequency
IUPAC_CODE_MAP
letter
1 2 3 4 5 6 7 8 |
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strsplit
[1] "A" "C" "G" "T"
[1] "A" "C" "G" "T" "M" "R" "W" "S" "Y" "K" "V" "H" "D" "B" "N" "-" "+" "."
13-letter "DNAString" instance
seq: TTGAAAA-CTC-N
[1] 13
[1] "A" "C" "G" "T" "M" "R" "W" "S" "Y" "K" "V" "H" "D" "B" "N" "-" "+" "."
[1] "A" "C" "G" "T"
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