I am trying to implement the Naive Gauss and getting the unsupported operand type error on execution. Output:
我正在尝试实现幼稚的Gauss,并在执行过程中得到不支持的操作和类型错误。输出:
execfile(filename, namespace)
File "/media/zax/MYLINUXLIVE/A0N-.py", line 26, in <module>
print Naive_Gauss([[2,3],[4,5]],[[6],[7]])
File "/media/zax/MYLINUXLIVE/A0N-.py", line 20, in Naive_Gauss
b[row] = b[row]-xmult*b[column]
TypeError: unsupported operand type(s) for -: 'list' and 'list'
>>>
This is the code
这是代码
def Naive_Gauss(Array,b):
n = len(Array)
for column in xrange(n-1):
for row in xrange(column+1, n):
xmult = Array[row][column] / Array[column][column]
Array[row][column] = xmult
#print Array[row][col]
for col in xrange(0, n):
Array[row][col] = Array[row][col] - xmult*Array[column][col]
b[row] = b[row]-xmult*b[column]
print Array
print b
print Naive_Gauss([[2,3],[4,5]],[[6],[7]])
2 个解决方案
#1
14
You can't subtract a list from a list.
你不能从列表中减去一个列表。
>>> [3, 7] - [1, 2]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for -: 'list' and 'list'
Simple way to do it is using numpy
:
简单的方法是使用numpy:
>>> import numpy as np
>>> np.array([3, 7]) - np.array([1, 2])
array([2, 5])
You can also use list comprehension, but it will require changing code in the function:
您还可以使用列表理解,但它需要在函数中更改代码:
>>> [a - b for a, b in zip([3, 7], [1, 2])]
[2, 5]
>>> import numpy as np
>>>
>>> def Naive_Gauss(Array,b):
... n = len(Array)
... for column in xrange(n-1):
... for row in xrange(column+1, n):
... xmult = Array[row][column] / Array[column][column]
... Array[row][column] = xmult
... #print Array[row][col]
... for col in xrange(0, n):
... Array[row][col] = Array[row][col] - xmult*Array[column][col]
... b[row] = b[row]-xmult*b[column]
... print Array
... print b
... return Array, b # <--- Without this, the function will return `None`.
...
>>> print Naive_Gauss(np.array([[2,3],[4,5]]),
... np.array([[6],[7]]))
[[ 2 3]
[-2 -1]]
[[ 6]
[-5]]
(array([[ 2, 3],
[-2, -1]]), array([[ 6],
[-5]]))
#2
2
Use Set in Python
在Python中使用组
>>> a = [2,4]
>>> b = [1,4,3]
>>> set(a) - set(b)
set([2])
#1
14
You can't subtract a list from a list.
你不能从列表中减去一个列表。
>>> [3, 7] - [1, 2]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for -: 'list' and 'list'
Simple way to do it is using numpy
:
简单的方法是使用numpy:
>>> import numpy as np
>>> np.array([3, 7]) - np.array([1, 2])
array([2, 5])
You can also use list comprehension, but it will require changing code in the function:
您还可以使用列表理解,但它需要在函数中更改代码:
>>> [a - b for a, b in zip([3, 7], [1, 2])]
[2, 5]
>>> import numpy as np
>>>
>>> def Naive_Gauss(Array,b):
... n = len(Array)
... for column in xrange(n-1):
... for row in xrange(column+1, n):
... xmult = Array[row][column] / Array[column][column]
... Array[row][column] = xmult
... #print Array[row][col]
... for col in xrange(0, n):
... Array[row][col] = Array[row][col] - xmult*Array[column][col]
... b[row] = b[row]-xmult*b[column]
... print Array
... print b
... return Array, b # <--- Without this, the function will return `None`.
...
>>> print Naive_Gauss(np.array([[2,3],[4,5]]),
... np.array([[6],[7]]))
[[ 2 3]
[-2 -1]]
[[ 6]
[-5]]
(array([[ 2, 3],
[-2, -1]]), array([[ 6],
[-5]]))
#2
2
Use Set in Python
在Python中使用组
>>> a = [2,4]
>>> b = [1,4,3]
>>> set(a) - set(b)
set([2])