Revision history [back]
 | 1 | initial version |
See
sage: A[1]
(1, 4, 6)
sage: A[1].is_immutable()
True
You get a vector that is immutable. When you do
sage: A[1][1]=6
you try to change the entry of index 1 of that vector, not the matrix A. The matrix A is mutable:
sage: A.is_mutable()
True
To change the entry of index 1,1 of the matrix A, you should do:
sage: A[1,1]=6
So that
sage: A
[ 1 2 -3]
[ 1 6 6]
[ 2 -1 -2]
| | 2 | No.2 Revision |
See
sage: A[1]
(1, 4, 6)
sage: A[1].is_immutable()
True
You get a vector that is immutable. When you do
sage: A[1][1]=6
A[1][1] = 6
you try to change the entry of index 1 of that vector, not the matrix A. The matrix A is mutable:
sage: A.is_mutable()
True
To change the entry of index 1,1 of the matrix A, you should do:
sage: A[1,1]=6
A[1,1] = 6
So that
sage: A
[ 1 2 -3]
[ 1 6 6]
[ 2 -1 -2]
