# sc_MOIndexSpace man page

sc::MOIndexSpace — Class **MOIndexSpace** describes a range of molecular orbitals or similar objects that are linear combinations of basis functions (e.g.

## Synopsis

`#include <moindexspace.h>`

Inherits **sc::SavableState**.

### Public Types

enum **IndexOrder** { **symmetry** = 0, **energy** = 1, **undefined** = 2 }

Describes the ordering of indices.

### Public Member Functions

**MOIndexSpace** (**StateIn** &)**MOIndexSpace** (std::string **name**, const **RefSCMatrix** &full_coefs, const **Ref**< **GaussianBasisSet** > **basis**, const **Ref**< **Integral** > &**integral**, const vector< int > &**offsets**, const vector< int > &nmopi, **IndexOrder moorder**=symmetry, const **RefDiagSCMatrix** &**evals**=0)

This function constructs an **MOIndexSpace** from (blocked) space full_coefs. **MOIndexSpace** (std::string **name**, const **RefSCMatrix** &full_coefs, const **Ref**< **GaussianBasisSet** > **basis**, const **Ref**< **Integral** > &**integral**, const **RefDiagSCMatrix** &**evals**, int nfzc, int nfzv, **IndexOrder moorder**=energy)

This constructor should be used when the **MOIndexSpace** object is a subspace of a full orbital space. **MOIndexSpace** (std::string **name**, const **RefSCMatrix** &full_coefs, const **Ref**< **GaussianBasisSet** > **basis**, const **Ref**< **Integral** > &**integral**)

This constructor should be used when the **MOIndexSpace** object is the full orbital space. **MOIndexSpace** (std::string **name**, const **Ref**< **MOIndexSpace** > &orig_space, const **RefSCMatrix** &new_coefs, const **Ref**< **GaussianBasisSet** > &new_basis)

This constructor is a true hack introduced because I have no idea how to construct what I need.

void **save_data_state** (**StateOut** &)

Save the base classes (with save_data_state) and the members in the same order that the **StateIn** CTOR initializes them.

const std::string **name** () const

Returns the name of this **MOIndexSpace**.

const **Ref**< **GaussianBasisSet** > **basis** () const

Returns the AO basis set. **Ref**< **Integral** > **integral** () const

Returns the integral factory used to instantiate the coefficient matrix.

const **RefSCMatrix coefs** () const

Returns the coefficient matrix.

const **RefDiagSCMatrix evals** () const

Returns the 'eigenvalues' matrix.

vector< int > **mosym** () const

Returns the orbital symmetry array. **IndexOrder moorder** () const

Returns the order of the orbitals.

int **rank** () const

Returns the rank of the space.

int **full_rank** () const

Returns the rank of the full space.

int **nblocks** () const

Returns the number of blocks.

vector< int > **nmo** () const

Returns the number of orbitals in each block.

vector< int > **offsets** () const

Returns the full-space index of the first orbital in each block.

int **to_full_space** (const int i) const

Returns the full-space index.

size_t **memory_in_use** () const

Returns how much 'significant' (i.e. O^2) memory this object uses.

void **print** (std::ostream &o=**ExEnv::out0**()) const

Prints out this.

void **print_summary** (std::ostream &os) const

Produces a short summary.

### Additional Inherited Members

## Detailed Description

Class **MOIndexSpace** describes a range of molecular orbitals or similar objects that are linear combinations of basis functions (e.g.

atomic orbitals). In general, such sets are subspaces of a full space of orbitals supported by the given basis. Orbitals can be symmetry-blocked, ordered by energy, etc. Examples of sets that can be described using **MOIndexSpace** are occupied MOs and virtual MOs.

## Constructor & Destructor Documentation

### sc::MOIndexSpace::MOIndexSpace (std::string name, const RefSCMatrix & full_coefs, const Ref< GaussianBasisSet > basis, const Ref< Integral > & integral, const vector< int > & offsets, const vector< int > & nmopi, IndexOrder moorder = symmetry, const RefDiagSCMatrix & evals = 0)

This function constructs an **MOIndexSpace** from (blocked) space full_coefs. Block i will contain vectors [ offsets[i], offsets[i]+nmopi[i]-1 ] . By default, the space maintains the same blocked structure and the same order within blocks as the original space (moorder=symmetry). If moorder=energy and eigenvalues evals are provided, then all vectors will be put in one block and sorted according to ascending evals.

**Parameters:***name*-- the name of this**MOIndexSpace***full_coefs*-- symmetry-blocked transformation coefficient matrix (AO by MO) for the full space*basis*-- basis set*integral*-- integral factory*offsets*-- block offsets*nmopi*-- new block sizes*moorder*-- specifies new ordering of vectors*evals*-- used to sort the vectors

### sc::MOIndexSpace::MOIndexSpace (std::string name, const RefSCMatrix & full_coefs, const Ref< GaussianBasisSet > basis, const Ref< Integral > & integral, const RefDiagSCMatrix & evals, int nfzc, int nfzv, IndexOrder moorder = energy)

This constructor should be used when the **MOIndexSpace** object is a subspace of a full orbital space. Similarly to the previous constructor, it constructs an **MOIndexSpace** object using a symmetry-blocked transformation coefficient matrix (AO by MO) for the full space, basis set, 'eigenvalues' and the number of orbitals with lowest (nfzc) and highest (nfzv) eigenvalues to be dropped. The orbitals in the constructed space are ordered by energy.

### sc::MOIndexSpace::MOIndexSpace (std::string name, const RefSCMatrix & full_coefs, const Ref< GaussianBasisSet > basis, const Ref< Integral > & integral)

This constructor should be used when the **MOIndexSpace** object is the full orbital space. The orbitals will be symmetry-blocked.

### sc::MOIndexSpace::MOIndexSpace (std::string name, const Ref< MOIndexSpace > & orig_space, const RefSCMatrix & new_coefs, const Ref< GaussianBasisSet > & new_basis)

This constructor is a true hack introduced because I have no idea how to construct what I need. It will copy orig_space but replace it's coefs with new_coefs, and its basis with new_basis.

## Member Function Documentation

### void sc::MOIndexSpace::save_data_state (StateOut &) [virtual]

Save the base classes (with save_data_state) and the members in the same order that the **StateIn** CTOR initializes them. This must be implemented by the derived class if the class has data.

Reimplemented from **sc::SavableState**.

## Author

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