it may sound a stupid question,
but I'd like to know how to retrieve in a variable the field overwhich a Matrix is defined
for example, if
K=GF(7)
M=random_matrix(K,2,2)
Is there a function where i can define for example
K'= M.field() [and K' would be equal to K]
?
M.parent() provides some information of course, but we cannot use it directly
Use the base_ring method.
Here is an example.
Define a field.
sage: K = GF(7)
sage: K
Finite Field of size 7
A matrix over this field.
sage: M = random_matrix(K, 2, 2)
The matrix's base ring:
sage: KK = M.base_ring()
sage: KK
Finite Field of size 7
Check that it is the same as your original field.
sage: K is KK
True
Asked: 2016-11-24 13:42:28 +0100
Seen: 218 times
Last updated: Nov 24 '16
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