Fix mean computation for zero sized ranks

ginkgo-project / ginkgo

Numerical linear algebra software package

https://ginkgo-project.github.io/

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Fix mean computation for zero sized ranks #1632

Open greole opened 4 days ago

greole commented 4 days ago

This PR makes sure to not divide by zero when calculating the mean of a distributed vector. This otherwise might occur if some ranks hold a local vector of length zero after repartitioning a matrix or vector.