Crash when loading PeaksWorkspace File

[Peter Parker]

Load the file 'peaks_qLab.nxs' from the Training Course Data folder. Mantid crashes.

[Peter Parker]

This is not as big an issue as I originally thought.

The problem with the file is that it contains multiple instances of a goniometer matrix that is not invertible, namely:

[[1, 0, 0],
 [0, 1, 0],
 [0, 0, 0]]

The code that produced the file has ​already been fixed, so future saves-to-file of PeakWorkspaces will no longer give us that problem.

This leaves us with two remaining issues:

• Updating ​TrainingCourseData.zip to include a new, correct version of peaks_qLab.nxs.

• Possibly modifying the code surrounding Kernel::Matrix::Invert() so that we can deal with non-conforming matrices that aren't invertible, without crashing Mantid.

[Peter Parker]

TrainingCourseData.zip now contains a working PeaksWorkspace file.

After discussing this with Nick, I'm going to set this as wontfix. This is because:

• We haven't had any users bring this up as a problem.
• PeaksWorskpaces have been correctly written out from Mantid since version 3.0.
• These files are cheap to create and there likely aren't that many incompatible files still lying around.

[Michael Reuter]

That sounds fine to me. If anyone does have a real issue a ticket can be made for the next release.

[Stuart Campbell]

This ticket has been transferred to github issue ​9716