I accidentally encountered the following:
sage: matrix([[0]], sparse=True).norm(oo)
Traceback (most recent call last):
...
TypeError: base_ring (=Category of objects) must be a ring
The same for 1 and Frobenius norms.
This happens in
A = self.apply_map(abs).change_ring(RDF)
What is the reason that the ring is changed to RDF at this stage? For a matrix
with integer entries, I'd appreciate an integer answer (for 1 and infinity
norms).
regards, CH
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