Hi. I can't find in the documentation an elegant solution for this quite simple question :
a = vector([1,2,3])
b = vector([4,5])How to find c = (1,2,3,4,5)
a+ b doesn't works like in Python ...
Recently there was a question about this on sage-devel, which led to the following nice suggestion:
sage: a = vector([1,2,3])
sage: b = vector([4,5])
sage: from itertools import chain
sage: c = vector(chain(a,b)); c
(1, 2, 3, 4, 5)Smart ! Danke I will create & use a simple function :
concatene_vectors(a,b):
return vector(chain(a,b))Click the "check mark" button near the answer to accept it and mark your question as solved.
Alternate solution :
sage: vector(vector([1, 2, 3]).list()+vector([4, 5]).list())
(1, 2, 3, 4, 5)Hence :
sage: def concatenate_vectors(*x):
....: return vector(reduce(lambda a,b:a+b, map(lambda u:u.list(), x)))
....:
sage: concatenate_vectors(vector([1, 2, 3]), vector([4, 5]), vector([6]))
(1, 2, 3, 4, 5, 6)HTH,
Or vector(list(a) + list(b)), using the notation in the original question.
Asked: 3 years ago
Seen: 1,158 times
Last updated: Aug 08 '21
Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.
