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Remove redundant modulo operation in vector_modn_dense #38835

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Remove redundant modulo operation in vector_modn_dense #38835

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69e7af6
Remove redundant modulo operation in vector_modn_dense
user202729 Oct 22, 2024
6819635
Minor change
user202729 Oct 27, 2024
c97a639
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user202729 Nov 1, 2024
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19 changes: 16 additions & 3 deletions src/sage/modules/vector_modn_dense.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -168,19 +168,32 @@ cdef class Vector_modn_dense(free_module_element.FreeModuleElement):
self._init(parent.degree(), parent, parent.base_ring().order())

def __init__(self, parent, x, coerce=True, copy=True):
"""
Create an element.

Note that ``coerce=False`` is dangerous::
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sage: V = VectorSpace(GF(7), 3)
sage: v = V([2, 9, -5], coerce=False)
sage: v[0] == v[1]
False
sage: v[0]+1 == v[1]+1
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True
sage: v[0] == v[2]
False
"""
cdef Py_ssize_t i
cdef mod_int a, p
cdef mod_int a
if isinstance(x, xrange):
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x = tuple(x)
if isinstance(x, (list, tuple)):
if len(x) != self._degree:
raise TypeError("x must be a list of the right length")
if coerce:
R = parent.base_ring()
p = R.order()
for i from 0 <= i < self._degree:
a = int(R(x[i]))
self._entries[i] = a % p
self._entries[i] = a
else:
for i from 0 <= i < self._degree:
self._entries[i] = x[i]
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