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Update lib.py

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providing default value to components parameter of  __init__()
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Ashwek Swamy 2018-11-12 23:33:22 +05:30 committed by GitHub
parent 63b2c4efe0
commit b2b34e2cda
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1 changed files with 7 additions and 13 deletions
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linear_algebra_python/src/lib.py
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@ -45,7 +45,7 @@ class Vector(object):
changeComponent(pos,value) : changes the specified component.
TODO: compare-operator
"""
def __init__(self,components):
def __init__(self,components=[]):
"""
input: components or nothing
simple constructor for init the vector
@ -95,13 +95,11 @@ class Vector(object):
returns a new vector that represents the sum.
"""
size = len(self)
result = []
if size == len(other):
for i in range(size):
result.append(self.__components[i] + other.component(i))
result = [self.__components[i] + other.component(i) for i in range(size)]
return Vector(result)
else:
raise Exception("must have the same size")
return Vector(result)
def __sub__(self,other):
"""
input: other vector
@ -109,22 +107,19 @@ class Vector(object):
returns a new vector that represents the differenz.
"""
size = len(self)
result = []
if size == len(other):
for i in range(size):
result.append(self.__components[i] - other.component(i))
result = [self.__components[i] - other.component(i) for i in range(size)]
return result
else: # error case
raise Exception("must have the same size")
return Vector(result)
def __mul__(self,other):
"""
mul implements the scalar multiplication
and the dot-product
"""
ans = []
if isinstance(other,float) or isinstance(other,int):
for c in self.__components:
ans.append(c*other)
ans = [c*other for c in self.__components]
return ans
elif (isinstance(other,Vector) and (len(self) == len(other))):
size = len(self)
summe = 0
@ -133,7 +128,6 @@ class Vector(object):
return summe
else: # error case
raise Exception("invalide operand!")
return Vector(ans)
def copy(self):
"""
copies this vector and returns it.