Revision history [back]

Use a copy of K instead, e.g.

sage: K = diagonal_matrix( QQ, [1,2,3,4,5] )
sage: K1 = copy(K)
sage: K1[0,0] += 1
sage: K1

[2 0 0 0 0]
[0 2 0 0 0]
[0 0 3 0 0]
[0 0 0 4 0]
[0 0 0 0 5]
sage: K

[1 0 0 0 0]
[0 2 0 0 0]
[0 0 3 0 0]
[0 0 0 4 0]
[0 0 0 0 5]

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.