# BioSimSpace._SireWrappers.Molecules¶

class BioSimSpace._SireWrappers.Molecules(molecules)

An immutable container class for storing molecules.

__init__(molecules)

Constructor.

Parameters

molecules (Sire.Mol.MoleculeGroup, Sire.System.System, System [Molecule]) – A Sire Molecues object, a Sire or BioSimSpace System object, or a list of BioSimSpace Molecule objects.

Methods

 __init__(molecules) Constructor. charge([property_map, is_lambda1]) Return the total molecular charge. Return a copy of this object. getAxisAlignedBoundingBox([property_map]) Get the axis-aligned bounding box enclosing the object. getMolecule(index) Return the molecule at the given index. Return the number of molecules in the system. search(query) Search the molecules for atoms and residues. Convert to a System object. translate(vector[, property_map]) Translate each molecule in the container.
charge(property_map={}, is_lambda1=False)

Return the total molecular charge.

Parameters
• property_map (dict) – A dictionary that maps system “properties” to their user defined values. This allows the user to refer to properties with their own naming scheme, e.g. { “charge” : “my-charge” }

• is_lambda1 (bool) – Whether to use the charge at lambda = 1 a molecule is merged.

Returns

charge – The molecular charge.

Return type

Charge

copy()

Return a copy of this object. The return type is same as the object on which copy is called.

Returns

object – A copy of the object.

Return type
getAxisAlignedBoundingBox(property_map={})

Get the axis-aligned bounding box enclosing the object.

Parameters

property_map (dict) – A dictionary that maps system “properties” to their user defined values. This allows the user to refer to properties with their own naming scheme, e.g. { “charge” : “my-charge” }

Returns

• box_min ([Length]) – The minimum coordinates of the axis-aligned bounding box in each dimension.

• box_max ([Length]) – The minimum coordinates of the axis-aligned bounding box in each dimension.

getMolecule(index)

Return the molecule at the given index.

Parameters

index (int) – The index of the molecule.

Returns

molecule – The requested molecule.

Return type

Molecule

nMolecules()

Return the number of molecules in the system.

Returns

num_molecules – The number of molecules in the system.

Return type

int

search(query)

Search the molecules for atoms and residues. Search results will be reduced to their minimal representation, i.e. a residue containing a single atom will be returned as a atom.

Parameters

query (str) – The search query.

Returns

results – A list of objects matching the search query.

Return type

Examples

Search for all residues named ALA.

>>> result = molecules.search("resname ALA")


Search for all oxygen or hydrogen atoms.

>>> result = molecules.search("element oxygen or element hydrogen")


Search for atom index 23.

>>> result = molecule.search("atomidx 23")

toSystem()

Convert to a System object.

Returns

system

Return type

System

translate(vector, property_map={})

Translate each molecule in the container.

Parameters
• vector ([Length]) – The translation vector in Angstroms.

• property_map (dict) – A dictionary that maps system “properties” to their user defined values. This allows the user to refer to properties with their own naming scheme, e.g. { “charge” : “my-charge” }