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Resolved uninitialized value warning in PixelTrackFitting #33881

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Jun 2, 2021
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Resolved uninitialized value warning in PixelTrackFitting #33881

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2 changes: 1 addition & 1 deletion RecoPixelVertexing/PixelTrackFitting/interface/RiemannFit.h
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Original file line number Diff line number Diff line change
Expand Up @@ -515,7 +515,7 @@ namespace riemannFit {
// scale
const double tempQ = mc.squaredNorm();
const double tempS = sqrt(n * 1. / tempQ); // scaling factor
p3D *= tempS;
p3D.block(0, 0, 2, n) *= tempS;
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was the older code running, BTW?
If I understood the warning correctly, was there supposed to be a crash here before this fix?

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@ericcano ericcano May 31, 2021 •
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Older code was running fine.
It was not supposed to crash. We simply scaled uninitialized values in place in the last row of the matrix just to overwrite them on the next statement. It was totally harmless (besides wasting n multiplications, and being the last compilation warning to clear).


// project on paraboloid
p3D.row(2) = p3D.block(0, 0, 2, n).colwise().squaredNorm();
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