Reorder by X-axis

[OwenArnold]

This relates to an issue reported by the user, where they have loaded ascii data in which the x-values are descending. It proves impossible to work with some features of mantid such as plotting if you do this.

The fix is simply to ensure that the x-axis is ordered smallest to largest, and that the y and e data also follow this ordering.

Using the data files attached and the following script, you can replicate this problem. Not that the plots generated do not graph the data properly as it is not ordered as expected.

# Load the text data.  Note, the erors bars are 0.0 due to the way they were processed earlier. 
Load(Filename=DataDir+'polref8481.dat',OutputWorkspace='r8481',Unit='MomentumTransfer')
Load(Filename=DataDir+'polref8483.dat',OutputWorkspace='r8483',Unit='MomentumTransfer')

# Display the data to see what we're starting with 
plotSpectrum([mtd['r8481'],mtd['r8483']],0)
# Notice that the default scaling is broken when the data has 

Rebin(InputWorkspace='r8481',OutputWorkspace='r8481',Params='0.009,-0.04,0.034',PreserveEvents='0')
Rebin(InputWorkspace='r8483',OutputWorkspace='r8483',Params='0.027,-0.04,0.150',PreserveEvents='0')

[OwenArnold]

This issue was originally trac ticket 7791

[OwenArnold]

http://trac.mantidproject.org/mantid/raw-attachment/ticket/7791/polref8481.dat
(uploaded by @OwenArnold on 2013-08-21T10:27:51)

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http://trac.mantidproject.org/mantid/raw-attachment/ticket/7791/polref8483.dat
(uploaded by @OwenArnold on 2013-08-21T10:28:01)

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