我得到了一个用python编写代码的双重求和公式。基本上,我得到了30个不同的数组,它们的e和k值有不同的排列,对应于一个负电荷或一个正电荷。这些电荷在总和中是qm和qn,因此qm=-1和qn=1。e的相对位置表示为m,k的相对位置表示为n。这些是总和中的m和n。这些数组被命名为s1、s2、s3、s4等。。。一直到s30。我将在这里为s3和s4提供一个示例数组,这样您就知道我在说什么了
s3由s3 = np.array( ['k','e','k','k','k','e','k','k','e','e','k','k','e','e','k','e','k','e','k','e','k','e','e','k','k','k','e','e','k','e','k','e','k','e','k','k','k','e','e','k','e','k','e','e','k','k','e','e','e','e'])
给出
s4由s4 = np.array( ['k','e','k','e','k','k','e','e','k','e','k','k','e','e','e','k','k','e','k','e','k','e','k','k','k','e','e','k','k','k','e','e','k','e','e','k','k','e','e','k','k','k','e','e','k','e','e','e','k','e'])
给出
所以,现在我定义了寻找位置,为'k'的nμ值和'e'的mμ值。这些功能如下
对于mμ值
def m_value(position_num, array_name):
"""
same as for the n_value, except for 'e' instead of 'k'
"""
cnt = 0
for i in range(len(array_name)):
if array_name[i]=='e':
cnt+=1
if cnt==position_num:
return i+1
return 0
对于n\U值
def n_value(position_num, array_name):
"""
this is a function to get all of the positions of
'k' in the array entered.
position_num = what number 'k' value you want (1st, 2nd, etc...)
array_name = what scd row (s1, s2, etc...)
define the specific element of the array
returns value of where the 'k' is in the given sequence
"""
cnt = 0
for i in range(len(array_name)):
if array_name[i]=='k':
cnt+=1
if cnt==position_num:
return i+1
return 0
然后,我分别定义了e和k的电荷
charge_values = {'e' : -1, 'k' : 1}
e\u charge=电荷值['e'] k\u电荷=电荷值['k']
并定义了一个要计数的N值
N = 50
最后,我为函数编写了一个定义,根据给我的求和公式求和,定义为“SCD”。给你
def SCD(array_name):
"""
this should sum all of the elements in accordance with the
SCD summation formula. see notes to see full layout of
formula and elements
"""
summ = 0.0
nposition_num=0
mposition_num=0
for m in range(2, N):
summ = 0.0
mposition_num = m_value(m, array_name)
qm = mposition_num*e_charge
for n in range (0, m-1):
nposition_num= n_value(n, array_name)
qn = nposition_num*k_charge
summ += qm*qn*np.sqrt(m-n)
summ += summ
summ = (summ/float(N))
return summ
现在,一个主要问题出现了。无论是什么数组,SCD返回的值总是0.0。我知道这是不准确的,所以我想知道是什么逻辑或编码错误,我在这导致输出总是产生一个零。我是python新手,所以任何提示或想法都将不胜感激
目前没有回答
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