Package rdkit :: Package Chem :: Package AtomPairs :: Module Torsions

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# Module Torsions

source code

    Contains an implementation of Topological-torsion fingerprints, as
    described in:

    R. Nilakantan, N. Bauman, J. S. Dixon, R. Venkataraghavan;
    "Topological Torsion: A New Molecular Descriptor for SAR Applications.
    Comparison with Other Descriptors" JCICS 27, 82-85 (1987).

Functions | [hide private]

pyScorePath(mol, path, size, atomCodes=None) Returns a score for an individual path. | source code

ExplainPathScore(score, size=4) >>> m = Chem.MolFromSmiles('C=CC') >>> score=pyScorePath(m,(0,1,2),3) >>> ExplainPathScore(score,3) (('C', 1, 0), ('C', 2, 1), ('C', 1, 1)) | source code

GetTopologicalTorsionFingerprintAsIds(mol, targetSize=4) | source code

_test() | source code

Variables | [hide private]

| GetTopologicalTorsionFingerprintAsIntVect = `rdMolDescriptors.G`...``

Imports: Chem, rdMolDescriptors, Utils, GetTopologicalTorsionFingerprint, GetHashedTopologicalTorsionFingerprint

Function Details | [hide private]

### pyScorePath(mol, path, size, atomCodes=None)

source code

    Returns a score for an individual path.

    >>> m = Chem.MolFromSmiles('CCCCC')
    >>> c1 = Utils.GetAtomCode(m.GetAtomWithIdx(0),1)
    >>> c2 = Utils.GetAtomCode(m.GetAtomWithIdx(1),2)
    >>> c3 = Utils.GetAtomCode(m.GetAtomWithIdx(2),2)
    >>> c4 = Utils.GetAtomCode(m.GetAtomWithIdx(3),1)
    >>> t = c1 | (c2 << rdMolDescriptors.AtomPairsParameters.codeSize) | (c3 << (rdMolDescriptors.AtomPairsParameters.codeSize*2)) | (c4 << (rdMolDescriptors.AtomPairsParameters.codeSize*3))
    >>> pyScorePath(m,(0,1,2,3),4)==t
    1

    The scores are path direction independent:
    >>> pyScorePath(m,(3,2,1,0),4)==t
    1

    >>> m = Chem.MolFromSmiles('C=CC(=O)O')
    >>> c1 = Utils.GetAtomCode(m.GetAtomWithIdx(0),1)
    >>> c2 = Utils.GetAtomCode(m.GetAtomWithIdx(1),2)
    >>> c3 = Utils.GetAtomCode(m.GetAtomWithIdx(2),2)
    >>> c4 = Utils.GetAtomCode(m.GetAtomWithIdx(4),1)
    >>> t = c1 | (c2 << rdMolDescriptors.AtomPairsParameters.codeSize) | (c3 << (rdMolDescriptors.AtomPairsParameters.codeSize*2)) | (c4 << (rdMolDescriptors.AtomPairsParameters.codeSize*3))
    >>> pyScorePath(m,(0,1,2,4),4)==t
    1

### ExplainPathScore(score, size=4)

source code

    >>> m = Chem.MolFromSmiles('C=CC')
    >>> score=pyScorePath(m,(0,1,2),3)
    >>> ExplainPathScore(score,3)
    (('C', 1, 0), ('C', 2, 1), ('C', 1, 1))

    Again, it's order independent:
    >>> score=pyScorePath(m,(2,1,0),3)
    >>> ExplainPathScore(score,3)
    (('C', 1, 0), ('C', 2, 1), ('C', 1, 1))

    >>> m = Chem.MolFromSmiles('C=CO')
    >>> score=pyScorePath(m,(0,1,2),3)
    >>> ExplainPathScore(score,3)
    (('C', 1, 1), ('C', 2, 1), ('O', 1, 0))

    >>> m = Chem.MolFromSmiles('OC=CO')
    >>> score=pyScorePath(m,(0,1,2,3),4)
    >>> ExplainPathScore(score,4)
    (('O', 1, 0), ('C', 2, 1), ('C', 2, 1), ('O', 1, 0))

    >>> m = Chem.MolFromSmiles('CC=CO')
    >>> score=pyScorePath(m,(0,1,2,3),4)
    >>> ExplainPathScore(score,4)
    (('C', 1, 0), ('C', 2, 1), ('C', 2, 1), ('O', 1, 0))

    >>> m = Chem.MolFromSmiles('C=CC(=O)O')
    >>> score=pyScorePath(m,(0,1,2,3),4)
    >>> ExplainPathScore(score,4)
    (('C', 1, 1), ('C', 2, 1), ('C', 3, 1), ('O', 1, 1))
    >>> score=pyScorePath(m,(0,1,2,4),4)
    >>> ExplainPathScore(score,4)
    (('C', 1, 1), ('C', 2, 1), ('C', 3, 1), ('O', 1, 0))

    >>> m = Chem.MolFromSmiles('OOOO')
    >>> score=pyScorePath(m,(0,1,2),3)
    >>> ExplainPathScore(score,3)
    (('O', 1, 0), ('O', 2, 0), ('O', 2, 0))
    >>> score=pyScorePath(m,(0,1,2,3),4)
    >>> ExplainPathScore(score,4)
    (('O', 1, 0), ('O', 2, 0), ('O', 2, 0), ('O', 1, 0))

Variables Details | [hide private]

### GetTopologicalTorsionFingerprintAsIntVect

Value:

      rdMolDescriptors.GetTopologicalTorsionFingerprint