canonicalNumbering {ChemmineR} | R Documentation

## Canonical Numbering

### Description

Computes a re-arrangement required to transform the atom numbering of the given compound into the canonical atom numbering. This function uses the OBGraphSym and CanonicalLabels classes of Open Babel to compute the re-arrangement.

### Usage

    canonicalNumbering(sdf)

### Arguments

`sdf` | Any sdfset object.

### Value

A list of vectors of index values. Each item in the list corresponds to one of the given compounds. The values of a list item are the re-arrangement of the atoms. For example, if the value in item 1, column 1 is 25, that means that atom number 1 in the original compound should become atom number 25 in the canonical version of that compound.

### Author(s)

Kevin Horan

### References

http://openbabel.org/api/2.3/canonical_code_algorithm.shtml

### See Also

`canonicalize`

### Examples

    	data(sdfsample)
    	labels = canonicalNumbering(sdfsample[1])

[Package ChemmineR version 3.32.1 Index]