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Data Comparison | ||
=============== | ||
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.. contents:: Table of Contents | ||
:local: | ||
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Overview | ||
-------- | ||
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.. interface:: Data Comparison | ||
:align: right | ||
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The data comparison interface provides a method of comparing the spectra of | ||
multiple :ref:`MatrixWorkspace <MatrixWorkspace>` (either pre loaded into | ||
Mantid or loaded via the interface its self) using a preview plot. | ||
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Add Data | ||
-------- | ||
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.. interface:: Data Comparison | ||
:widget: gbAddData | ||
:align: right | ||
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This allows new data to be added to the comparison, this can be added by either | ||
selecting a :ref:`MatrixWorkspace <MatrixWorkspace>` alrady loaded into Mantid | ||
or by selecting a file to load. | ||
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Once the data has been selected the *Add Data* button can be used to add it to | ||
the comparison, this will add a curve to the preview plot and assign it the next | ||
unused colour for the curve (if all are in use then black will be used). | ||
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Data Table | ||
---------- | ||
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.. interface:: Data Comparison | ||
:widget: gbCurrentData | ||
:align: right | ||
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The data table shows a list of the current data shown on the plot including the | ||
workspace name and currently plotted spectrum index. This also allows the curve | ||
colour to be changed manually. | ||
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This also allows a spectrum index offset to be set on a per workspace basis, | ||
this allows workspaces to be aligned relative to each other in the venet that | ||
the spectra that you want to compare do not have the same spectrum index in each | ||
workspace. | ||
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The value of the offset for a workspace defines the spectrum index that the | ||
first spectum will line up to relative to the spectrum selection spin box. At | ||
least one offset value must be zero (this is set check for automatically after | ||
an offset value has been changed). | ||
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Diff | ||
---- | ||
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.. interface:: Data Comparison | ||
:widget: gbDiff | ||
:align: right | ||
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A diff spectra of two workspaces can be created by selecting two workspaces in | ||
the data table (by holding Ctrl whilst making a selection) and clicking the *Diff | ||
Selected* button, this will subtract the current spectra for the second workspace | ||
selected from the current spectra for the first spectra selected and plot the | ||
result spectra as a green curve on the plot. | ||
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If either of the diff workspaces are removed then the diff will be cleared. If | ||
one of the workspaces can no longer be displayed as it is offset from the other | ||
workspace then a messsage will be displayed in the diff tool and no plot will be | ||
shown, however the diff will continue to function once both workspaces can be | ||
displayed again. | ||
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The diff workspace is created by running :ref:`ExtractSignleSpectrum | ||
<algm-ExtractSingleSpectrum>` on the two data workspaces and then using | ||
:ref:`Minus <algm-Minus>` to calculate the difference. | ||
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.. categories:: Interfaces General |