Revision history [back]
 | 1 | initial version |
The assertion error comes from the line
assert(M.parent() == N.parent())
because:
sage: B.parent()
Full MatrixSpace of 4 by 4 dense matrices over Fraction Field of Multivariate Polynomial Ring in x over Rational Field
sage: R.parent()
Full MatrixSpace of 4 by 4 dense matrices over Rational Field
Just remove that line and you will get:
sage: elementwise(B,R) # with the assertion removed
[ (-1)/(x^4 + 2*x^3 + x^2 - 1) (-x^2 - x)/(x^4 + 2*x^3 + x^2 - 1) 0 (-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1)]
[ (-x^2 - x)/(x^4 + 2*x^3 + x^2 - 1) (-1)/(x^4 + 2*x^3 + x^2 - 1) (-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1) 0]
[(-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1) 0 0 (-x^2)/(x^4 + 2*x^3 + x^2 - 1)]
[ 0 (-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1) (-x^2)/(x^4 + 2*x^3 + x^2 - 1) 0]
Alternatively, define both matrices on the same ring:
sage: elementwise(B,R.change_ring(B.base_ring())) # without removing the assertion
[ (-1)/(x^4 + 2*x^3 + x^2 - 1) (-x^2 - x)/(x^4 + 2*x^3 + x^2 - 1) 0 (-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1)]
[ (-x^2 - x)/(x^4 + 2*x^3 + x^2 - 1) (-1)/(x^4 + 2*x^3 + x^2 - 1) (-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1) 0]
[(-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1) 0 0 (-x^2)/(x^4 + 2*x^3 + x^2 - 1)]
[ 0 (-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1) (-x^2)/(x^4 + 2*x^3 + x^2 - 1) 0]
| | 2 | No.2 Revision |
The assertion error comes from the line
assert(M.parent() == N.parent())
because:
sage: B.parent()
Full MatrixSpace of 4 by 4 dense matrices over Fraction Field of Multivariate Polynomial Ring in x over Rational Field
sage: R.parent()
Full MatrixSpace of 4 by 4 dense matrices over Rational Field
Just remove that line and you will get:
sage: elementwise(B,R) # with the assertion removed
[ (-1)/(x^4 + 2*x^3 + x^2 - 1) (-x^2 - x)/(x^4 + 2*x^3 + x^2 - 1) 0 (-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1)]
[ (-x^2 - x)/(x^4 + 2*x^3 + x^2 - 1) (-1)/(x^4 + 2*x^3 + x^2 - 1) (-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1) 0]
[(-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1) 0 0 (-x^2)/(x^4 + 2*x^3 + x^2 - 1)]
[ 0 (-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1) (-x^2)/(x^4 + 2*x^3 + x^2 - 1) 0]
Alternatively, if you want to keep your function intact, you can define both matrices on the same ring:
sage: elementwise(B,R.change_ring(B.base_ring())) # without removing the assertion
[ (-1)/(x^4 + 2*x^3 + x^2 - 1) (-x^2 - x)/(x^4 + 2*x^3 + x^2 - 1) 0 (-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1)]
[ (-x^2 - x)/(x^4 + 2*x^3 + x^2 - 1) (-1)/(x^4 + 2*x^3 + x^2 - 1) (-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1) 0]
[(-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1) 0 0 (-x^2)/(x^4 + 2*x^3 + x^2 - 1)]
[ 0 (-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1) (-x^2)/(x^4 + 2*x^3 + x^2 - 1) 0]
Alternatively, the elementwise_product method doesthe job, see R.elementwise_product? for the documentation:
sage: R.elementwise_product(B)
[ (-1)/(x^4 + 2*x^3 + x^2 - 1) (-x^2 - x)/(x^4 + 2*x^3 + x^2 - 1) 0 (-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1)]
[ (-x^2 - x)/(x^4 + 2*x^3 + x^2 - 1) (-1)/(x^4 + 2*x^3 + x^2 - 1) (-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1) 0]
[(-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1) 0 0 (-x^2)/(x^4 + 2*x^3 + x^2 - 1)]
[ 0 (-x^3 - x^2)/(x^4 + 2*x^3 + x^2 - 1) (-x^2)/(x^4 + 2*x^3 + x^2 - 1) 0]
