def norm(vec: DSList):
"""
Computes the norm of the argument vector.
:param vec: DSList
:return: float
"""
return math.sqrt(vec.map(sqr).reduce(add, 0))
def smul(scalar: float, vec: DSList):
"""
Compute the product of a scalar and a vector
:param scalar: float
:param vec: DSList
:return: DSList
"""
return vec.map(lambda num: scalar*num)
def test_map_empty():
# pylint: disable=missing-docstring
slst = SList()
exp = SList()
res = slst.map(fun.idt)
assert res == exp
def test_map_id():
# pylint: disable=missing-docstring
slst = SList([1, 2, 3])
exp = SList([1, 2, 3])
res = slst.map(fun.idt)
assert res == exp
def test_map_reduce_non_empty():
# pylint: disable=missing-docstring
slst = SList([1, 2, 3, 4])
res = slst.map_reduce(fun.incr, operator.add, 0)
exp = slst.map(fun.incr).reduce(operator.add)
assert res == exp
