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Is there a reliable way to check if an object is a vector?

asked 2020-10-14 10:57:18 -0500

more_weight gravatar image

I'm want to check if a given sage object obj is a vector or not. I'd like to do this as efficiently as possible. Currently my best idea is:

sage_input(obj).__repr__().startswith('vector')

This works, assuming that sage_input is smart enough to identify every vector without false positives. However, this solution feels inefficient (and also inelegant!). Is there a better way?

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answered 2020-10-14 11:06:58 -0500

rburing gravatar image

updated 2020-10-14 11:11:18 -0500

You want is_Vector:

sage: from sage.structure.element import is_Vector
sage: v = vector([1,2,3])
sage: is_Vector(v)
True
sage: is_Vector([1,2,3])
False

It checks whether the input is an instance of the abstract element class Vector.

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Comments

Ha. Had no idea this was built in. Thanks!

more_weight gravatar imagemore_weight ( 2020-10-14 13:37:10 -0500 )edit

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Asked: 2020-10-14 10:57:18 -0500

Seen: 50 times

Last updated: Oct 14