R: Converts amino-acid one-letter code into the three-letter one

aaa {seqinr} | R Documentation

## Converts amino-acid one-letter code into the three-letter one

### Description

This is a vectorized function to convert one-letter amino-acid code into the three-letter one, for instance "A" into "Ala".

### Usage

    aaa(aa)

### Arguments

`aa` | A vector of single characters.

### Details

Allowed character values for `aa` are given by `a()`. All other values will generate a warning and return NA. Called without arguments, `aaa()` returns the list of all possible output values.

### Value

A vector of char string. All strings are 3 chars long.

### Author(s)

J.R. Lobry

### References

The IUPAC one-letter code for aminoacids is described at: http://www.chem.qmul.ac.uk/iupac/AminoAcid/ `citation("seqinr")`

### See Also

`a`, `translate`

### Examples

      #
      # Show all possible input values:
      #

      a()

      #
      # Convert them in one letter-code:
      #

      aaa(a())

      #
      # Check consistency of results:
      #

      stopifnot(a(aaa(a())) == a())

      #
      # Show what happens with non-allowed values:
      #

      aaa("Z") # should be NA and a warning is generated

[Package seqinr version 3.4-5 Index]