.. algorithm::

.. summary::

.. relatedalgorithms::

.. properties::

Description
-----------

This algorithm performs the ElasticWindow algorithm over a set of workspaces
provided as a workspace group, the binning of each workspace must match.

The Q and Q-squared output workspaces show the output of ElasticWindow for each
input workspace, the ELF workspace shows the data transposed with the X axis in
either sample temperature or run number of temperature is not available.

The ELT workspace shows the normalisation of the ELF workspace to run with the
lowest sample temperature.

Workflow
--------

.. diagram:: ElasticWindowMultiple-v1_wkflw.dot

Usage
-----

.. testcode:: exElasticWindowMultiple

    # This test needs the facility to be set to ISIS to load the IRIS instrument
    facility = config['default.facility']
    config['default.facility'] = 'ISIS'

    # Create some sample data
    widths = [15.0, 17.5, 20.0, 22.5, 25.0, 27.5, 30.0]
    for idx, fwhm in enumerate(widths):
        ws_name = 'ws_%.1f' % fwhm
        function = 'name=Lorentzian,Amplitude=100,PeakCentre=27500,FWHM=%f' % fwhm
        CreateSampleWorkspace(Function='User Defined',
                              UserDefinedFunction=function,
                              XMin=27000,
                              XMax=28000,
                              BinWidth=10,
                              NumBanks=1,
                              OutputWorkspace=ws_name)

        ConvertUnits(InputWorkspace=ws_name,
                     OutputWorkspace=ws_name,
                     Target='DeltaE',
                     EMode='Indirect',
                     EFixed=1.555)

        Rebin(InputWorkspace=ws_name,
               OutputWorkspace=ws_name,
               Params=[-0.2,0.004,0.2])

        LoadInstrument(Workspace=ws_name,
                       InstrumentName='IRIS', RewriteSpectraMap=True)

        SetInstrumentParameter(Workspace=ws_name,
                               ParameterName='Efixed',
                               DetectorList=range(1,113),
                               ParameterType='Number',
                               Value='1.555')

        mtd[ws_name].mutableRun()['run_number'] = idx + 1

    input = GroupWorkspaces(InputWorkspaces=['ws_%.1f' % fwhm for fwhm in widths])

    # Run the algorithm
    q, q2, elf = ElasticWindowMultiple(input, -0.1, 0.1)

    print('ELF X axis: %s' % elf.getAxis(0).getUnit().caption())
    print('ELF spectra count: %d' % elf.getNumberHistograms())
    print('ELF bin count: %d' % elf.blocksize())

    # Reset the facility to the original setting
    config['default.facility'] = facility

.. testoutput:: exElasticWindowMultiple

    ELF X axis: Run No
    ELF spectra count: 100
    ELF bin count: 7

.. categories::

.. sourcelink::