An AAString object allows efficient storage
and manipulation of a long amino acid sequence.
Usage
AAString(x="", start=1, nchar=NA)
## Predefined constants:
AA_ALPHABET # full Amino Acid alphabet
AA_STANDARD # first 20 letters only
AA_PROTEINOGENIC # first 22 letters only
Arguments
x
A single string.
start, nchar
Where to start reading from in x and how many letters to read.
Details
The AAString class is a direct XString subclass
(with no additional slot).
Therefore all functions and methods described in the
XString man page also work
with an AAString object (inheritance).
Unlike the BString container that allows storage
of any single string (based on a single-byte character set)
the AAString container can only store a string
based on the Amino Acid alphabet (see below).
The Amino Acid alphabet
This alphabet contains all letters from the
Single-Letter Amino Acid Code (see ?AMINO_ACID_CODE)
plus "*" (the stop letter), "-" (the gap
letter), "+" (the hard masking letter), and "."
(the not a letter or not available letter).
It is stored in the AA_ALPHABET predefined constant (character
vector).
The alphabet() function returns AA_ALPHABET when
applied to an AAString object.
Constructor-like functions and generics
In the code snippet below,
x can be a single string (character vector of length 1)
or a BString object.
AAString(x="", start=1, nchar=NA):
Tries to convert x into an AAString object by reading
nchar letters starting at position start in x.
Accessor methods
In the code snippet below, x is an AAString object.
alphabet(x):
If x is an AAString object, then return the Amino Acid
alphabet (see above).
See the corresponding man pages when x is a
BString, DNAString or RNAString object.
AA_ALPHABET
a <- AAString("MARKSLEMSIR*")
length(a)
alphabet(a)
Results
R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
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> library(Biostrings)
Loading required package: BiocGenerics
Loading required package: parallel
Attaching package: 'BiocGenerics'
The following objects are masked from 'package:parallel':
clusterApply, clusterApplyLB, clusterCall, clusterEvalQ,
clusterExport, clusterMap, parApply, parCapply, parLapply,
parLapplyLB, parRapply, parSapply, parSapplyLB
The following objects are masked from 'package:stats':
IQR, mad, xtabs
The following objects are masked from 'package:base':
Filter, Find, Map, Position, Reduce, anyDuplicated, append,
as.data.frame, cbind, colnames, do.call, duplicated, eval, evalq,
get, grep, grepl, intersect, is.unsorted, lapply, lengths, mapply,
match, mget, order, paste, pmax, pmax.int, pmin, pmin.int, rank,
rbind, rownames, sapply, setdiff, sort, table, tapply, union,
unique, unsplit
Loading required package: S4Vectors
Loading required package: stats4
Attaching package: 'S4Vectors'
The following objects are masked from 'package:base':
colMeans, colSums, expand.grid, rowMeans, rowSums
Loading required package: IRanges
Loading required package: XVector
> png(filename="/home/ddbj/snapshot/RGM3/R_BC/result/Biostrings/AAString-class.Rd_%03d_medium.png", width=480, height=480)
> ### Name: AAString-class
> ### Title: AAString objects
> ### Aliases: class:AAString AAString-class AA_ALPHABET AA_STANDARD
> ### AA_PROTEINOGENIC AAString
> ### Keywords: methods classes
>
> ### ** Examples
>
> AA_ALPHABET
[1] "A" "R" "N" "D" "C" "Q" "E" "G" "H" "I" "L" "K" "M" "F" "P" "S" "T" "W" "Y"
[20] "V" "U" "O" "B" "J" "Z" "X" "*" "-" "+" "."
> a <- AAString("MARKSLEMSIR*")
> length(a)
[1] 12
> alphabet(a)
[1] "A" "R" "N" "D" "C" "Q" "E" "G" "H" "I" "L" "K" "M" "F" "P" "S" "T" "W" "Y"
[20] "V" "U" "O" "B" "J" "Z" "X" "*" "-" "+" "."
>
>
>
>
>
> dev.off()
null device
1
>