4.2

CropWorkspaceRagged v1

../_images/CropWorkspaceRagged-v1_dlg.png

CropWorkspaceRagged dialog.

Summary

Crop each spectrum of a workspace independently

Properties

Name Direction Type Default Description
InputWorkspace Input Workspace Mandatory input workspace
OutputWorkspace Output Workspace Mandatory output workspace
XMin Input dbl list   minimum x values with NaN meaning no minimum
XMax Input dbl list   maximum x values with NaN meaning no maximum

Description

This is a workflow algorithm that crops each spectrum of a workspace independently. This is intended for workspaces with a relatively small number of spectra (e.g. <10), but places no restrictions on the input workspace.

The minimum and maximum values that are specified are interpreted as follows:

  • One value per spectrum. If there is only one value overall, it is used for all of the spectra.
  • numpy.nan, math.nan, and np.inf are interpreted to mean use the data’s minimum or maximum x-value.

Usage

Note

To run these usage examples please first download the usage data, and add these to your path. In MantidPlot this is done using Manage User Directories.

This is an example of how CropWorkspaceRagged would be used near the end of a workflow to generate a real-space distribution of data after it had been reduced into a number of “banks” or “spectra.” As mentioned above, numpy.nan or math.nan can both be used.

from numpy import nan
NOM_91796 = LoadNexusProcessed(Filename='NOM_91796_banks.nxs')
CropWorkspaceRagged(InputWorkspace=NOM_91796, OutputWorkspace='cropped',
                    Xmin=[0.67, 1.20, 2.42, 3.70, 4.12, 0.39],
                    Xmax=[10.20, 20.8, nan, nan, nan, 9.35])
binning=(0.,.02,40.)
Rebin(InputWorkspace='cropped', OutputWorkspace='cropped',
      Params=binning)
# put into a single spectrum and Fourier transform
SumSpectra(InputWorkspace='cropped', OutputWorkspace='FQ',
           WeightedSum=True, RemoveSpecialValues=True)
PDFFourierTransform(InputWorkspace='FQ', OutputWorkspace='Gr',
                    InputSofQType='Q[S(Q)-1]', DeltaR=.02)

Categories: AlgorithmIndex | Transforms\Splitting | Workflow

Source

Python: CropWorkspaceRagged.py (last modified: 2018-10-05)