Fix cube-arith possible problem in 'pearsonr'. #3621
Merged
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This addresses the concern which is the last remaining unticked todo in #3554.
We are currently still uncertain what the exact behaviour of cube arithmetic will be in Iris 3.0.
In the absence of #3478, we have currently enabled
cube.copy()
to replicate cell measures, which means that certain operations no longer discard cell measures (or ancillaries).This creates possible problems for some existing user code, and some internal code including this
pearsonr
routine.In principle, #3618 will also fix this problem, but we may yet choose #3478 over that and we're not yet sure exactly what that will do.
So this change is a definite resolution of this small problem, irrespective of what we eventually choose to do about cube arithmetic generally.