EvaluateMDFunction v1

../_images/EvaluateMDFunction-v1_dlg.png

EvaluateMDFunction dialog.

Warning

EvaluateMDFunction is deprecated. Use EvaluateFunction instead.

Summary

Evaluates an MD function on a MD histo workspace.

Properties

Name Direction Type Default Description
InputWorkspace Input IMDHistoWorkspace Mandatory An input workspace that provides dimensions for the output.
Function InOut Function Mandatory Parameters defining the fitting function and its initial values
OutputWorkspace Output IMDHistoWorkspace Mandatory An output workspace.

Description

Note: this algorithm is deprecated, use EvaluateFunction instead.

The algorithm will use the axes of the input workspace to evaluate a functions on them and store the result in the output workspace.

This is a plot of the evaluated function from the usage example below.

Function3D.png

Usage

# Create an empty 3D histo workspace.
n = 50 * 50 * 50
ws=CreateMDHistoWorkspace(Dimensionality=3, Extents='-1,1,-1,1, -1,1',\
    SignalInput = [0.0] * n, ErrorInput = [1.0] * n,\
    NumberOfBins='50,50,50',Names='Dim1,Dim2,Dim3',Units='MomentumTransfer,MomentumTransfer,MomentumTransfer')

# Define a function
function = 'name=UserFunctionMD,Formula=1.0/(1.0 + 100*(0.5 - x^2 - y^2 -z^2)^2)'

# Evaluate the function on the created workspace
out = EvaluateMDFunction(ws,function)

# Check the result workspace
print out.getNumDims()
print out.getXDimension().getName()
print out.getYDimension().getName()
print out.getZDimension().getName()

Output

3
Dim1
Dim2
Dim3

Categories: Algorithms | MDAlgorithms\Creation | Deprecated