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Segmentation fault where no data #44

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paulharris opened this issue Apr 16, 2012 · 0 comments

paulharris commented Apr 16, 2012

If you create a KDTreeSingleIndex with no data, it will segfault when you call buildIndex().

This assumes that you create the dataset matrix with the number of columns that it would have IF there were data,
but with zero rows.

Minimal example:

// empty dataset, with 3 columns if there were data.
Matrix dataset(NULL, 0, 3);
KDTreeSingleIndex< L2 > index(dataset);
index.buildIndex();

This also happens for findNeighbors() due to computeInitialDistances() segfault.

I would suggest either assert()ing that there is data, or doing an if (empty) return; or similar.

thanks again,
Paul

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