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66 lines
952 B
Python
Executable File
66 lines
952 B
Python
Executable File
# A simple vector class
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def vec(*v):
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return apply(Vec().init, v)
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class Vec:
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def init(self, *v):
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self.v = []
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for x in v:
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self.v.append(x)
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return self
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def fromlist(self, v):
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self.v = []
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if type(v) <> type([]):
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raise TypeError
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self.v = v[:]
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return self
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def __repr__(self):
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return 'vec(' + `self.v`[1:-1] + ')'
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def __len__(self):
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return len(self.v)
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def __getitem__(self, i):
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return self.v[i]
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def __add__(a, b):
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# Element-wise addition
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v = []
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for i in range(len(a)):
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v.append(a[i] + b[i])
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return Vec().fromlist(v)
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def __sub__(a, b):
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# Element-wise subtraction
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v = []
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for i in range(len(a)):
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v.append(a[i] - b[i])
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return Vec().fromlist(v)
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def __mul__(self, scalar):
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# Multiply by scalar
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v = []
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for i in range(len(self.v)):
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v.append(self.v[i]*scalar)
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return Vec().fromlist(v)
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def test():
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a = vec(1, 2, 3)
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b = vec(3, 2, 1)
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print a
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print b
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print a+b
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print a*3.0
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test()
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