SoizeGhanemFactory

class SoizeGhanemFactory(*args)

SoizeGhanem orthonormal multivariate functional family.

For the any multivariate distribution with continuous copula.

Available constructor:

SoizeGhanemFactory()

SoizeGhanemFactory(measure, useCopula)

SoizeGhanemFactory(measure, phi, useCopula)

Parameters
measureDistribution

The measure defining the inner product of the factory.

phiEnumerateFunction

The function mapping the index of the multivariate basis function to the multi-index of the marginal variables. Default is to use the LinearEnumerateFunction.

useCopulabool

Flag to tell if the copula density has to be used directly or indirectly through the joint PDF of the measure. Default is True.

See also

StandardDistributionPolynomialFactory, OrthogonalProductPolynomialFactory

Notes

This class implements the multivariate orthonormal basis associated with an arbitrary multidimensional distribution with continuous copula and marginals with well-defined orthonormal polyomials of arbitrary order. The details are in [soizeghanem2004].

Examples

>>> import openturns as ot
>>> marginals = [ot.Uniform(-1.0, 1.0), ot.Normal(0.0, 1.0)]
>>> copula = ot.ClaytonCopula(1.0)
>>> distribution = ot.ComposedDistribution(marginals, copula)
>>> factory = ot.SoizeGhanemFactory(distribution)
>>> point = [0.5]*2
>>> for i in range(3):
...     value = factory.build(i)(point)
...     print('SoizeGhanem_' + str(i) + '(' + str(point) + ')=' + str(value))
SoizeGhanem_0([0.5, 0.5])=[0.870518]
SoizeGhanem_1([0.5, 0.5])=[0.753891]
SoizeGhanem_2([0.5, 0.5])=[0.435259]

Methods

build(*args)

Get the term of the basis collection at a given index or multi-indices.

getClassName()

Accessor to the object’s name.

getDimension()

Get the dimension of the Basis.

getEnumerateFunction()

Return the enumerate function.

getId()

Accessor to the object’s id.

getMeasure()

Get the measure upon which the basis is orthogonal.

getName()

Accessor to the object’s name.

getShadowedId()

Accessor to the object’s shadowed id.

getSize()

Get the size of the Basis.

getSubBasis(indices)

Get a sub-basis of the Basis.

getVisibility()

Accessor to the object’s visibility state.

hasName()

Test if the object is named.

hasVisibleName()

Test if the object has a distinguishable name.

isFinite()

Tell whether the basis is finite.

isOrthogonal()

Tell whether the basis is orthogonal.

setName(name)

Accessor to the object’s name.

setShadowedId(id)

Accessor to the object’s shadowed id.

setVisibility(visible)

Accessor to the object’s visibility state.

add
__init__(*args)

Initialize self. See help(type(self)) for accurate signature.

build(*args)

Get the term of the basis collection at a given index or multi-indices.

Parameters
indexint

Indicates the term of the basis which must be constructed. In other words, index is used by a bijection from \Nset to \Nset^d (with d the dimension of the basis). The bijection is detailed in EnumerateFunction.

indicessequence of int

Indicates the term of the basis which must be constructed. In other words, indices is used by a bijection from \Nset^d to \Nset (with d the dimension of the basis). The bijection is the inverse of EnumerateFunction.

Returns
functionFunction

The term of the basis collection at the index index or the inverse of indices.

Examples

>>> import openturns as ot
>>> # Create an orthogonal basis
>>> polynomialCollection = [ot.LegendreFactory(), ot.LaguerreFactory(), ot.HermiteFactory()]
>>> productBasis = ot.OrthogonalBasis(ot.OrthogonalProductPolynomialFactory(polynomialCollection))
>>> termBasis = productBasis.build(4)
>>> print(termBasis.getEvaluation())
-1.11803 + 3.3541 * x0^2
>>> termBasis = productBasis.build(5)
>>> print(termBasis.getEvaluation())
(1.73205 * x0) * (-1 + x1)
>>> termBasis2 = productBasis.build([1,1,0])
>>> print(termBasis2.getEvaluation())
(1.73205 * x0) * (-1 + x1)
getClassName()

Accessor to the object’s name.

Returns
class_namestr

The object class name (object.__class__.__name__).

getDimension()

Get the dimension of the Basis.

Returns
dimensionint

Dimension of the Basis.

getEnumerateFunction()

Return the enumerate function.

Returns
enumerateFunctionEnumerateFunction

Enumerate function that translates unidimensional indices into multidimensional indices.

getId()

Accessor to the object’s id.

Returns
idint

Internal unique identifier.

getMeasure()

Get the measure upon which the basis is orthogonal.

Returns
measureDistribution

Measure upon which the basis is orthogonal.

Examples

>>> import openturns as ot
>>> # Create an orthogonal basis
>>> polynomialCollection = [ot.LegendreFactory(), ot.LaguerreFactory(), ot.HermiteFactory()]
>>> productBasis = ot.OrthogonalBasis(ot.OrthogonalProductPolynomialFactory(polynomialCollection))
>>> measure = productBasis.getMeasure()
>>> print(measure.getMarginal(0))
Uniform(a = -1, b = 1)
>>> print(measure.getMarginal(1))
Gamma(k = 1, lambda = 1, gamma = 0)
>>> print(measure.getMarginal(2))
Normal(mu = 0, sigma = 1)
getName()

Accessor to the object’s name.

Returns
namestr

The name of the object.

getShadowedId()

Accessor to the object’s shadowed id.

Returns
idint

Internal unique identifier.

getSize()

Get the size of the Basis.

Returns
sizeint

Size of the Basis.

getSubBasis(indices)

Get a sub-basis of the Basis.

Parameters
indiceslist of int

Indices of the terms of the Basis put in the sub-basis.

Returns
subBasislist of Function

Functions defining a sub-basis.

Examples

>>> import openturns as ot
>>> dimension = 3
>>> input = ['x0', 'x1', 'x2']
>>> functions = []
>>> for i in range(dimension):
...     functions.append(ot.SymbolicFunction(input, [input[i]]))
>>> basis = ot.Basis(functions)
>>> subbasis = basis.getSubBasis([1])
>>> print(subbasis[0].getEvaluation())
[x0,x1,x2]->[x1]
getVisibility()

Accessor to the object’s visibility state.

Returns
visiblebool

Visibility flag.

hasName()

Test if the object is named.

Returns
hasNamebool

True if the name is not empty.

hasVisibleName()

Test if the object has a distinguishable name.

Returns
hasVisibleNamebool

True if the name is not empty and not the default one.

isFinite()

Tell whether the basis is finite.

Returns
isFinitebool

True if the basis is finite.

isOrthogonal()

Tell whether the basis is orthogonal.

Returns
isOrthogonalbool

True if the basis is orthogonal.

setName(name)

Accessor to the object’s name.

Parameters
namestr

The name of the object.

setShadowedId(id)

Accessor to the object’s shadowed id.

Parameters
idint

Internal unique identifier.

setVisibility(visible)

Accessor to the object’s visibility state.

Parameters
visiblebool

Visibility flag.