see https://trac.sagemath.org/ticket/22799 :
polynomials with numpy coefficients strike again, this time if you build
Sage with clang:
sage: import numpy as np
sage: x=polygen(RR) # this is problematic
sage: y=polygen(RDF) # this works fine
sage: np.float('1.5')*x
1.50000000000000*x
sage: np.float('1.5')*y
1.5*x
sage: np.float32('1.5')*x
/usr/home/dima/Sage/sage/src/bin/sage-ipython:1: RuntimeWarning: invalid
value encountered in multiply
#!/usr/bin/env python
1.50000000000000*x
sage: np.float64('1.5')*x
/usr/home/dima/Sage/sage/src/bin/sage-ipython:1: RuntimeWarning: invalid
value encountered in multiply
#!/usr/bin/env python
1.50000000000000*x
sage: np.float64('1.5')*y
1.5*x
sage: np.float32('1.5')*y
1.5*x
Finding out where exactly in numpy this warning happens is not easy (one
can set up a numpy interrupt handler, but because it happens in compiled
code, error message is almost meaningless)
but it looks as if it might be a coercion problem.
Any ideas where to look?
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