IMP Reference Guide
2.5.0
The Integrative Modeling Platform

Code to compute statistical measures. More...
Code to compute statistical measures.
Data to be clustered is represented one of two ways, either with an IMP::statistics::Embedding or a IMP::statistics::Metric. The representation is then passed to an algorithm that returns a clustering object such as an IMP::statistics::PartitionalClustering.
Author(s): Keren Lasker, Daniel Russel
Maintainer: benmwebb
License: LGPL This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
Publications:
Classes  
class  ChiSquareMetric 
Compute the distance between two configurations using chi2. More...  
class  ConfigurationSetRMSDMetric 
class  ConfigurationSetXYZEmbedding 
Embed a configuration using the XYZ coordinates of a set of particles. More...  
class  Embedding 
Store data to be clustered for embedding based algorithms. More...  
class  EuclideanMetric 
class  HistogramD 
Dynamically build a histogram embedded in Ddimensional space. More...  
class  Metric 
Store data to be clustered for distance metric based algorithms. More...  
class  ParticleEmbedding 
class  PartitionalClustering 
A base class for clustering results where each item is in one cluster. More...  
class  PartitionalClusteringWithCenter 
class  RecursivePartitionalClusteringEmbedding 
class  RecursivePartitionalClusteringMetric 
class  VectorDEmbedding 
Simply return the coordinates of a VectorD. More...  
Typedefs  
typedef IMP::Vector < IMP::Pointer< Embedding > >  Embeddings 
typedef IMP::Vector < IMP::WeakPointer< Embedding > >  EmbeddingsTemp 
typedef IMP::Vector < IMP::Pointer< Metric > >  Metrics 
typedef IMP::Vector < IMP::WeakPointer< Metric > >  MetricsTemp 
Python only  
void  show_histogram (HistogramD h, std::string xscale="linear", std::string yscale="linear", Functions curves=Functions()) 
Standard module functions  
All  
std::string  get_module_version () 
std::string  get_module_name () 
std::string  get_data_path (std::string file_name) 
Return the full path to one of this module's data files. More...  
std::string  get_example_path (std::string file_name) 
Return the full path to one of this module's example files. More...  
typedef IMP::Vector<IMP::Pointer< Embedding > > IMP::statistics::Embeddings 
Store a set of objects.
Definition at line 48 of file statistics/embedding.h.
typedef IMP::Vector<IMP::Pointer< Metric > > IMP::statistics::Metrics 
typedef IMP::Vector<IMP::WeakPointer< Metric > > IMP::statistics::MetricsTemp 
PartitionalClusteringWithCenter* IMP::statistics::create_bin_based_clustering  (  Embedding *  embed, 
double  side  
) 
The space is grided with bins of side size and all points that fall in the same grid bin are made part of the same cluster.
PartitionalClustering* IMP::statistics::create_centrality_clustering  (  Metric *  d, 
double  far,  
int  k  
) 
Cluster by repeatedly removing edges which have lots of shortest paths passing through them. The process is terminated when there are a set number of connected components. Other termination criteria can be added if someone proposes them.
Only items closer than far are connected.
PartitionalClustering* IMP::statistics::create_centrality_clustering  (  Embedding *  d, 
double  far,  
int  k  
) 
Cluster by repeatedly removing edges which have lots of shortest paths passing through them. The process is terminated when there are a set number of connected components. Other termination criteria can be added if someone proposes them.
PartitionalClusteringWithCenter* IMP::statistics::create_connectivity_clustering  (  Embedding *  embed, 
double  dist  
) 
Two points, \(p_i\), \(p_j\) are in the same cluster if there is a sequence of points \(\left(p^{ij}_{0}\dots p^{ij}_k\right)\) such that \(\forall l p^{ij}_lp^{ij}_{l+1} < d\).
PartitionalClustering* IMP::statistics::create_connectivity_clustering  (  Metric *  metric, 
double  dist  
) 
Two points, \(p_i\), \(p_j\) are in the same cluster if there is a sequence of points \(\left(p^{ij}_{0}\dots p^{ij}_k\right)\) such that \(\forall l p^{ij}_lp^{ij}_{l+1} < d\).
PartitionalClustering* IMP::statistics::create_diameter_clustering  (  Metric *  d, 
double  maximum_diameter  
) 
Cluster the elements into clusters with at most the specified diameter.
PartitionalClustering* IMP::statistics::create_gromos_clustering  (  Metric *  d, 
double  cutoff  
) 
Cutoffbased clustering as defined in Daura et al. Angew. Chem. Int. Ed. 1999. 38(1‐2): p. 236240.
PartitionalClusteringWithCenter* IMP::statistics::create_lloyds_kmeans  (  Embedding *  embedding, 
unsigned int  k,  
unsigned int  iterations  
) 
Return a kmeans clustering of all points contained in the embedding (ie [0... embedding>get_number_of_embeddings())). These points are then clustered into k clusters. More iterations takes longer but produces a better clustering.
The algorithm uses algebra::EuclideanVectorKDMetric for computing distances between embeddings and cluster centers. This can be parameterized if desired.
algebra::VectorKDs IMP::statistics::get_centroids  (  Embedding *  d, 
PartitionalClustering *  pc  
) 
Given a clustering and an embedding, compute the centroid for each cluster
std::string IMP::statistics::get_data_path  (  std::string  file_name  ) 
Return the full path to one of this module's data files.
To read the data file "data_library" that was placed in the data
directory of this module, do something like
This will ensure that the code works both when IMP is installed or if used via the setup_environment.sh
script.
std::string IMP::statistics::get_example_path  (  std::string  file_name  ) 
Return the full path to one of this module's example files.
To read the example file "example_protein.pdb" that was placed in the examples
directory of this module, do something like
This will ensure that the code works both when IMP is installed or if used via the setup_environment.sh
script.
double IMP::statistics::get_quantile  (  const Histogram1D &  h, 
double  fraction  
) 
Return the midpoint of the bin that best approximates the specified quantile (passed as a fraction). That is, passing .5 returns the median. And passing .9
Ints IMP::statistics::get_representatives  (  Embedding *  d, 
PartitionalClustering *  pc  
) 
Given a clustering and an embedding, compute a representative element for each cluster.
void IMP::statistics::show_histogram  (  HistogramD  h, 
std::string  xscale = "linear" , 

std::string  yscale = "linear" , 

Functions  curves = Functions() 

) 
In Python, you can use matplot lib, if installed, to show the contents of a histogram. At the moment, only 1D and 2D histograms are supported.
[in]  h  The histogram to show; the plot is sized to the histogram's bounding box. 
[in]  xscale  Whether the xscale is "linear" or "log" 
[in]  yscale  Whether the yscale is "linear" or "log" 
[in]  curves  A list of Python functions to plot on the histogram as curves. The functions should take one float and return a float. 
void IMP::statistics::validate_partitional_clustering  (  PartitionalClustering *  pc, 
unsigned int  n  
) 
Check that the clustering is a valid clustering of n elements.
An exception is thrown if it is not, if the build is not a fast build.