DisperseModel

sans.models.DisperseModel

Wrapper for the Disperser class extension

author:Mathieu Doucet / UTK contact:mathieu.doucet@nist.gov

class sans.models.DisperseModel.DisperseModel(model, paramList, sigmaList)

Bases: Disperser, sans.models.BaseComponent.BaseComponent

Wrapper class for the Disperser extension Python class that takes a model and averages its output for a distribution of its parameters.

The parameters to be varied are specified at instantiation time. The distributions are Gaussian, with std deviations specified for each parameter at instantiation time.

Example:

cyl = ModelFactory().getModel("CylinderModel")
disp = DisperseModel(cyl, ['cyl_phi'], [0.3])
disp.run([0.01, 1.57])

calculate_ER()

clone()

Return a identical copy of self

evalDistribution(qdist)

Evaluate a distribution of q-values.

• For 1D, a numpy array is expected as input:

  evalDistribution(q)

where q is a numpy array.

• For 2D, a list of numpy arrays are expected: [qx_prime,qy_prime], where 1D arrays,

qx_prime = [ qx[0], qx[1], qx[2], ....] and qy_prime = [ qy[0], qy[1], qy[2], ....]

Then get q = numpy.sqrt(qx_prime^2+qy_prime^2)

that is a qr in 1D array; q = [q[0], q[1], q[2], ....]

Note :

Due to 2D speed issue, no anisotropic scattering is supported for python models, thus C-models should have

their own evalDistribution methods.

The method is then called the following way:

evalDistribution(q) where q is a numpy array.

Parameters:qdist – ndarray of scalar q-values or list [qx,qy] where qx,qy are 1D ndarrays

getDispParamList()

Return a list of all available parameters for the model

getParam(name)

getParamList()

Return a list of all available parameters for the model

getParamListWithToken(token, member)

getParamWithToken(name, token, member)

is_fittable(par_name)

Check if a given parameter is fittable or not

Parameters:par_name – the parameter name to check

model

Model to disperse

params

Parameters

run(x=0.0)

Evaluate the model

Parameters:x – input q, or [q,phi] Returns:scattering function P(q)

runXY(x=0.0)

Evaluate the model

Parameters:x – input q, or [q,phi] Returns:scattering function P(q)

setParam(name, value)

setParamWithToken(name, value, token, member)