PIPE2D-1046: Singular matrix in spectral extraction #270
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PaulPrice
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Wavelength needs to be in double precision in order to preserve the precision in the measurements, but other quantities (esp. flux) don't need double precision, and datamodel I/O has been reverted to single-precision for these to save disk space. This commit adapts to these changes.
Helps to have access to the workspace in python to understand problems.
It should not be possible to fail an assertion merely because a user provided data with the wrong sizes.
The matrix for spectral extraction can be singular if two fibers rely on the same single pixel. This manifests in solveSymmetricTridiagonal as denominator=0, which leads to all values in the solution being NaN, due to the back-propagation. Instead, when we get denominator=0, treat that element like it doesn't have any data (set diagonal=1, offDiag=0, answer=0) and set the solution for that element to NAN.
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