Sage Reference Manual: Matrices and Spaces of Matrices - Mirrors

Sage Reference Manual: Matrices and Spaces of Matrices, Release 6.1.1
Traceback (most recent call last):
...
TypeError: Cannot set column with Rational Field elements over Integer Ring, use change_ring
set_row(row, v)
Sets the entries of row row to the entries of v.
INPUT:
•row - index of row to be set.
•v - a list or vector of the new entries.
OUTPUT:
Changes the matrix in-place, so there is no output.
EXAMPLES:
New entries may be contained in a vector.:
sage: A = matrix(QQ, 5, range(25))
sage: u = vector(QQ, [0, -1, -2, -3, -4])
sage: A.set_row(2, u)
sage: A
[ 0 1 2 3 4]
[ 5 6 7 8 9]
[ 0 -1 -2 -3 -4]
[15 16 17 18 19]
[20 21 22 23 24]
New entries may be in any sort of list.:
sage: A = matrix([[1, 2], [3, 4]]); A
[1 2]
[3 4]
sage: A.set_row(0, [0, 0]); A
[0 0]
[3 4]
sage: A.set_row(1, (0, 0)); A
[0 0]
[0 0]
TESTS:
sage: A = matrix([[1, 2], [3, 4]])
sage: A.set_row(2, [0, 0]); A
Traceback (most recent call last):
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ValueError: row number must be between 0 and 1 (inclusive), not 2
sage: A.set_row(0, [0, 0, 0])
Traceback (most recent call last):
...
ValueError: list of new entries must be of length 2 (not 3)
sage: A = matrix(2, [1, 2, 3, 4])
sage: A.set_row(0, [1/3, 1]); A
Traceback (most recent call last):
...
TypeError: Cannot set row with Rational Field elements over Integer Ring, use change_ring fi
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