edu.stanford.math.plex4.utility

Class FormalSumUtility

java.lang.Object

edu.stanford.math.plex4.utility.FormalSumUtility

public class FormalSumUtility
extends java.lang.Object

This class contains various utility functions for interacting with formal sums (chains).

Author:

Andrew Tausz

Constructor Summary

Constructors

Constructor and Description
FormalSumUtility()

Method Summary

Methods

Modifier and Type	Method and Description
static <U> java.util.List<U>	extractActiveBasisElements(edu.stanford.math.primitivelib.autogen.formal_sum.BooleanSparseFormalSum<U> chain) This function returns all of the basis elements in a chain which have non-zero coefficients.
static <U> java.util.List<U>	extractActiveBasisElements(edu.stanford.math.primitivelib.autogen.formal_sum.IntSparseFormalSum<U> chain) This function returns all of the basis elements in a chain which have non-zero coefficients.
static <F,U> java.util.List<U>	extractActiveBasisElements(edu.stanford.math.primitivelib.autogen.formal_sum.ObjectSparseFormalSum<F,U> chain) This function returns all of the basis elements in a chain which have non-zero coefficients.
static java.util.List<java.lang.Integer>	extractCoefficients(edu.stanford.math.primitivelib.autogen.formal_sum.IntSparseFormalSum<?> chain) This function returns the coefficients for a formal sum in the form of a list.
static <F,U> java.util.List<F>	extractCoefficients(edu.stanford.math.primitivelib.autogen.formal_sum.ObjectSparseFormalSum<F,U> chain) This function returns the coefficients for a formal sum in the form of a list.
static int[][]	extractVertices(java.util.List<Simplex> simplices) This function extracts the set of vertices from a list of simplices and returns a 2-d array containing the vertices.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FormalSumUtility

public FormalSumUtility()

Method Detail

extractActiveBasisElements

public static <F,U> java.util.List<U> extractActiveBasisElements(edu.stanford.math.primitivelib.autogen.formal_sum.ObjectSparseFormalSum<F,U> chain)

This function returns all of the basis elements in a chain which have non-zero coefficients. The primary use case will be to extract the set of simplicies in a chain.

Parameters:

chain -

Returns:

the set of active basis elements in a formal sum

extractActiveBasisElements

public static <U> java.util.List<U> extractActiveBasisElements(edu.stanford.math.primitivelib.autogen.formal_sum.IntSparseFormalSum<U> chain)

This function returns all of the basis elements in a chain which have non-zero coefficients. The primary use case will be to extract the set of simplicies in a chain.

Parameters:

chain -

Returns:

the set of active basis elements in a formal sum

extractActiveBasisElements

public static <U> java.util.List<U> extractActiveBasisElements(edu.stanford.math.primitivelib.autogen.formal_sum.BooleanSparseFormalSum<U> chain)

This function returns all of the basis elements in a chain which have non-zero coefficients. The primary use case will be to extract the set of simplicies in a chain.

Parameters:

chain -

Returns:

the set of active basis elements in a formal sum

extractCoefficients

public static java.util.List<java.lang.Integer> extractCoefficients(edu.stanford.math.primitivelib.autogen.formal_sum.IntSparseFormalSum<?> chain)

This function returns the coefficients for a formal sum in the form of a list.

Parameters:

chain -

Returns:

the coefficients in the chain

extractCoefficients

public static <F,U> java.util.List<F> extractCoefficients(edu.stanford.math.primitivelib.autogen.formal_sum.ObjectSparseFormalSum<F,U> chain)

This function returns the coefficients for a formal sum in the form of a list.

Parameters:

chain -

Returns:

the coefficients in the chain

extractVertices

public static int[][] extractVertices(java.util.List<Simplex> simplices)

This function extracts the set of vertices from a list of simplices and returns a 2-d array containing the vertices.

Parameters:

simplices -

Returns:

the vertices for a list of simplices