本文整理汇总了Python中Vector.Vector.minus方法的典型用法代码示例。如果您正苦于以下问题：Python Vector.minus方法的具体用法？Python Vector.minus怎么用？Python Vector.minus使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Vector.Vector的用法示例。
在下文中一共展示了Vector.minus方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: Line
# 需要导入模块: from Vector import Vector [as 别名]
# 或者: from Vector.Vector import minus [as 别名]
class Line(object):
NO_NONZERO_ELTS_FOUND_MSG = 'No nonzero elements found'
def __init__(self, normal_vector=None, constant_term=None):
self.dimension = 2
if not normal_vector:
all_zeros = ['0']*self.dimension
normal_vector = Vector(all_zeros)
self.normal_vector = normal_vector
if not constant_term:
constant_term = Decimal('0')
self.constant_term = Decimal(constant_term)
self.set_basepoint()
def set_basepoint(self):
try:
n = self.normal_vector
c = self.constant_term
basepoint_coords = ['0'] * self.dimension
initial_index = Line.first_nonzero_index(n)
initial_coefficient = n[initial_index]
basepoint_coords[initial_index] = c / initial_coefficient
self.basepoint = Vector(basepoint_coords)
except Exception as e:
if str(e) == Line.NO_NONZERO_ELTS_FOUND_MSG:
self.basepoint = None
else:
raise e
def __str__(self):
num_decimal_places = 3
def write_coefficient(coefficient, is_initial_term=False):
coefficient = round(coefficient, num_decimal_places)
if coefficient % 1 == 0:
coefficient = int(coefficient)
output = ''
if coefficient < 0:
output += '-'
if coefficient > 0 and not is_initial_term:
output += '+'
if not is_initial_term:
output += ' '
if abs(coefficient) != 1:
output += '{}'.format(abs(coefficient))
return output
n = self.normal_vector
try:
initial_index = Line.first_nonzero_index(n)
terms = [write_coefficient(n[i], is_initial_term=(i==initial_index)) + 'x_{}'.format(i+1)
for i in range(self.dimension) if round(n[i], num_decimal_places) != 0]
output = ' '.join(terms)
except Exception as e:
if str(e) == self.NO_NONZERO_ELTS_FOUND_MSG:
output = '0'
else:
raise e
constant = round(self.constant_term, num_decimal_places)
if constant % 1 == 0:
constant = int(constant)
output += ' = {}'.format(constant)
return output
def __eq__(self, line):
if self.normal_vector.is_zero():
if not line.normal_vector().is_zero():
return False
else:
diff = self.constant_term - line.constant_term
return MyDecimal(diff).is_near_zero()
elif line.normal_vector.is_zero():
return False
if not self.is_parallel_with(line):
return False
basepoint_diffrence = self.basepoint.minus(line.basepoint)
return self.normal_vector.is_orthogonal_with(basepoint_diffrence)
def is_parallel_with(self, line):
#.........这里部分代码省略.........
示例2: Plane
# 需要导入模块: from Vector import Vector [as 别名]
# 或者: from Vector.Vector import minus [as 别名]
class Plane(object):
NO_NONZERO_ELTS_FOUND_MSG = 'No nonzero elements found'
def __init__(self, normal_vector=None, constant_term=None):
self.dimension = 3
if not normal_vector:
all_zeros = ['0']*self.dimension
normal_vector = Vector(all_zeros)
self.normal_vector = normal_vector
if not constant_term:
constant_term = Decimal('0')
self.constant_term = Decimal(constant_term)
self.set_basepoint()
def set_basepoint(self):
try:
n = self.normal_vector
c = self.constant_term
basepoint_coords = ['0']*self.dimension
initial_index = Plane.first_nonzero_index(n)
initial_coefficient = n[initial_index]
basepoint_coords[initial_index] = c/initial_coefficient
self.basepoint = Vector(basepoint_coords)
except Exception as e:
if str(e) == Plane.NO_NONZERO_ELTS_FOUND_MSG:
self.basepoint = None
else:
raise e
def __str__(self):
num_decimal_places = 3
def write_coefficient(coefficient, is_initial_term=False):
coefficient = round(coefficient, num_decimal_places)
if coefficient % 1 == 0:
coefficient = int(coefficient)
output = ''
if coefficient < 0:
output += '-'
if coefficient > 0 and not is_initial_term:
output += '+'
if not is_initial_term:
output += ' '
if abs(coefficient) != 1:
output += '{}'.format(abs(coefficient))
return output
n = self.normal_vector
try:
initial_index = Plane.first_nonzero_index(n)
terms = [write_coefficient(n[i], is_initial_term=(i==initial_index)) + 'x_{}'.format(i+1)
for i in range(self.dimension) if round(n[i], num_decimal_places) != 0]
output = ' '.join(terms)
except Exception as e:
if str(e) == self.NO_NONZERO_ELTS_FOUND_MSG:
output = '0'
else:
raise e
constant = round(self.constant_term, num_decimal_places)
if constant % 1 == 0:
constant = int(constant)
output += ' = {}'.format(constant)
return output
def __eq__(self, plane):
if self.normal_vector.is_zero():
if not plane.normal_vector().is_zero():
return False
else:
diff = self.constant_term - plane.constant_term
return MyDecimal(diff).is_near_zero()
elif plane.normal_vector.is_zero():
return False
if not self.is_parallel_with(plane):
return False
basepoint_diffrence = self.basepoint.minus(plane.basepoint)
return self.normal_vector.is_orthogonal_with(basepoint_diffrence)
def is_parallel_with(self, plane):
#.........这里部分代码省略.........