如何在python中执行嵌套循环
[英]How to do nested loop in python
问题描述
I would like to do nested loop in my programming. 
我想在我的程序中做嵌套循环。 However, this code did not meet my expectation. 但是，此代码不符合我的期望。
X=[0,1,1,1,0]
length=len(X)
for i,val in enumerate(X):
a=0
count=0
while (count<length):
a=15+a
print (a)
HWPQ=np.matrix([[1, 0, 0, 0], [0, math.cos(4*math.radians(a)),
math.sin(4*math.radians(a)), 0], [0, math.sin(4 * math.radians(a)), -
math.cos(4 * math.radians(a)), 0], [0, 0, 0, -1]])
result=HWPQ*val
print (result)
count=count +1
print ("\n")
Supposedly, in this program, I would like to update the value of a for each element using the loop. 据推测，在这种程序中，我想更新的值a用于使用所述回路中的每个元件。 For example: 例如：
X=0 for a=0
X=1 for a=15
X=1 for a=30
X=1 for a=45
X=0 for a=60
The result should be, as I calculated it manually: 结果应该是，正如我手动计算的那样：
[[ 0. 0. 0. 0.]
[ 0. 0. 0. 0.]
[ 0. 0. 0. 0.]
[ 0. 0. 0. 0.]]
[[ 1. 0. 0. 0. ]
[ 0. 0.5 0.8660254 0. ]
[ 0. 0.8660254 -0.5 0. ]
[ 0. 0. 0. -1. ]]
[[ 1. 0. 0. 0. ]
[ 0. -0.5 0.8660254 0. ]
[ 0. 0.8660254 0.5 0. ]
[ 0. 0. 0. -1. ]]
[[ 1.00000000e+00 0.00000000e+00 0.00000000e+00 0.00000000e+00]
[ 0.00000000e+00 -1.00000000e+00 1.22464680e-16 0.00000000e+00]
[ 0.00000000e+00 1.22464680e-16 1.00000000e+00 0.00000000e+00]
[ 0.00000000e+00 0.00000000e+00 0.00000000e+00 -1.00000000e+00]]
[[ 0. 0. 0. 0.]
[ 0. 0. 0. 0.]
[ 0. 0. 0. 0.]
[ 0. 0. 0. 0.]]
1 个解决方案
解决方案1
1 已采纳 2018-07-27 03:15:24
There seem to be a load of unnecessary variables in your code, like count , X , and i . 您的代码中似乎有很多不必要的变量，例如count ， X和i 。 Removing them and using a standard for loop, you get: 删除它们并使用标准的for循环，您将获得：
X=[0,1,1,1,0]
a=0
for val in X:
print (a)
HWPQ=np.matrix([
[1, 0, 0, 0],
[0, math.cos(4*math.radians(a)), math.sin(4*math.radians(a)), 0],
[0, math.sin(4 * math.radians(a)), - math.cos(4 * math.radians(a)), 0],
[0, 0, 0, -1]])
result=HWPQ*val
print (result)
a=15+a
print ("\n")
which creates the output that you want. 这将创建所需的输出。
0
[[ 0. 0. 0. 0.]
[ 0. 0. 0. 0.]
[ 0. 0. 0. 0.]
[ 0. 0. 0. 0.]]
15
[[ 1. 0. 0. 0. ]
[ 0. 0.5 0.8660254 0. ]
[ 0. 0.8660254 -0.5 0. ]
[ 0. 0. 0. -1. ]]
30
[[ 1. 0. 0. 0. ]
[ 0. -0.5 0.8660254 0. ]
[ 0. 0.8660254 0.5 0. ]
[ 0. 0. 0. -1. ]]
45
[[ 1.00000000e+00 0.00000000e+00 0.00000000e+00 0.00000000e+00]
[ 0.00000000e+00 -1.00000000e+00 1.22464680e-16 0.00000000e+00]
[ 0.00000000e+00 1.22464680e-16 1.00000000e+00 0.00000000e+00]
[ 0.00000000e+00 0.00000000e+00 0.00000000e+00 -1.00000000e+00]]
60
[[ 0. 0. 0. 0.]
[ 0. 0. 0. 0.]
[ 0. 0. 0. 0.]
[ 0. 0. 0. 0.]]
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