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# A simple vector class
def vec(*v):
return Vec(*v)
class Vec:
def __init__(self, *v):
self.v = list(v)
def fromlist(self, v):
if not isinstance(v, list):
raise TypeError
self.v = v[:]
return self
def __repr__(self):
return 'vec(' + repr(self.v)[1:-1] + ')'
def __len__(self):
return len(self.v)
def __getitem__(self, i):
return self.v[i]
def __add__(self, other):
# Element-wise addition
v = map(lambda x, y: x+y, self, other)
return Vec().fromlist(v)
def __sub__(self, other):
# Element-wise subtraction
v = map(lambda x, y: x-y, self, other)
return Vec().fromlist(v)
def __mul__(self, scalar):
# Multiply by scalar
v = map(lambda x: x*scalar, self.v)
return Vec().fromlist(v)
def test():
a = vec(1, 2, 3)
b = vec(3, 2, 1)
print a
print b
print a+b
print a-b
print a*3.0
test()
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