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ProjectMD dialog.
Table of Contents
| Name | Direction | Type | Default | Description |
|---|---|---|---|---|
| InputWorkspace | Input | IMDHistoWorkspace | Mandatory | |
| ProjectDirection | Input | string | Z | The project direction. Allowed values: [‘X’, ‘Y’, ‘Z’, ‘K’] |
| StartIndex | Input | number | 0 | |
| EndIndex | Input | number | -1 | |
| OutputWorkspace | Output | Workspace | Mandatory |
ProjectMD reduces the dimensionality of a MHDistoWorkspace by summing it along a specified dimension. Example: you have a 3D MDHistoWorkspace with X,Y,TOF. You sum along Z (TOF) and the result is a 2D workspace X,Y which gives you a detector image.
Besides the obvious input and output workspaces you have to specify the dimension along which you wish to sum. The following code is used:
The summation range also has to be specified. This is in indices into the appropriate axis.
Example - Summing a couple of dimensions
def outputMDDimensions(ws):
num_dims = ws.getNumDims()
print("Name Bins Min Max")
for dim_index in range(num_dims):
dim = ws.getDimension(dim_index)
print("{} {} {:.2f} {:.2f}".format(
dim.name, dim.getNBins(), dim.getMinimum(), dim.getMaximum()))
#create a test MD event workspace
mdew = CreateMDWorkspace(Dimensions=3, Extents=[-1,1,-5,5,-9,10],
Names='A, B, C', Units='U, U, U')
FakeMDEventData(mdew, PeakParams=[100000, 0, 0, 0, 1])
#convert to a MDHisto workspace suing BinMD
wsHisto = BinMD(mdew,AlignedDim0='A,-1,1,9',
AlignedDim1='B,-5,5,5',
AlignedDim2='C,-9,10,9')
print("The original workspace")
outputMDDimensions(wsHisto)
wsProjected1 = ProjectMD(wsHisto,ProjectDirection="Z")
print("\nAfter the workspace has been summed in the Z direction")
outputMDDimensions(wsProjected1)
wsProjected2 = ProjectMD(wsProjected1,ProjectDirection="X")
print("\nAfter the workspace has been also been summed in the X direction")
outputMDDimensions(wsProjected2)
The original workspace
Name Bins Min Max
A 9 -1.00 1.00
B 5 -5.00 5.00
C 9 -9.00 10.00
After the workspace has been summed in the Z direction
Name Bins Min Max
A 9 -1.00 1.00
B 5 -5.00 5.00
After the workspace has been also been summed in the X direction
Name Bins Min Max
B 5 -5.00 5.00
Categories: AlgorithmIndex | MDAlgorithms\Slicing