Room for performance improvements in "sequential fit" with Resolution function

[mantid-builder]

Original Reporter: Michael Whitty

This ticket is blocks : TRAC6000

A common use case for the indirect group is to do a convolution fit on their data, which is a lorentzian and a resolution function.

To facilitate this, I made changes to the resolution function to allow for a nexus file as input - so that it can be more easily generated and managed within Mantid.

When this fit function is used within the PlotPeakByLogValue algorithm, it will re-load the nexus file for each spectra.

Is there a way we can move some element of this up to the controlling algorithm so that the sub-algorithm Fit does not feel the need to do this?

Also - would be desirable to be able to have the resolution taken as being the same workspace index as the current input being fitted.

[mantid-builder]

This issue was originally trac ticket 2389

[mantid-builder]

http://trac.mantidproject.org/mantid/raw-attachment/ticket/2389/script.py
(uploaded by @mantid-roman on 2013-11-18T13:07:18)

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http://trac.mantidproject.org/mantid/raw-attachment/ticket/2389/data3.nxs
(uploaded by @mantid-roman on 2013-11-18T13:07:25)

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http://trac.mantidproject.org/mantid/raw-attachment/ticket/2389/resolution3.nxs
(uploaded by @mantid-roman on 2013-11-18T13:07:31)

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