所以,使用pymatgen,我有一个结构对象。我想要做的是获得结构中的所有键角。我可以遍历每个原子以获得所有键角,但这包括每个原子,无论它们有多远,这当然是一个问题。
现在,我可以使用“get_neighbors”函数找到每个中心原子的邻居,但是,我不知道从哪里开始,特别是因为“get_angle”函数采用整数值而不是原子站点对象。
以下是我到目前为止的代码:
import pymatgen as mg
import numpy as np
s = mg.Structure.from_file('POSCAR')
atoms = s.atomic_numbers
van = [x for x in atoms if x == 23]
length = len(van)
nb = ['NONE']*length
x = 0
while x < length:
nb[x] = s.get_neighbors(s[x],2.4)
x += 1
所以我有一个邻居的数组,我知道它们对应的是哪个原子,现在我只需要得到所有相邻原子的角度。
非常感谢任何帮助。
答案 0 :(得分:0)
更新
所以,我已经想出了这样做的方法。我实际上将每个相邻原子转换为它们的笛卡尔坐标。然后,我减去了相邻原子所附着的中心原子的坐标。最后,我通过计算每两个向量的点积除以它们的大小的乘积来找到角度,然后取这些值的反余弦值。我使用的代码如下。这可能不是最优雅的做事方式,但确实可以完成工作。如果有人有改进,请随时发表评论。
import random
import itertools as iter
import pymatgen as mg
import numpy as np
import math
def all_angles(POSCAR,amin,amax):
s = mg.Structure.from_file(POSCAR)
atoms = s.atomic_numbers
van = [x for x in atoms if x == 23]
length = len(van)
nb = ['NONE']*length
x = 0
n = 0
while x < length:
nb[x] = s.get_neighbors(s[x],2.4)
x += 1
w = 100
h = len(van)
oxygen = [[0 for x in range(w)] for y in range(h)]
x = 0
y = 0
while x < len(nb):
y = 0
n = 0
while y < len(nb[x]):
oxygen[x][n] = (nb[x][y][0]).coords
n += 1
y += 1
x += 1
x = 0
while x < len(oxygen):
oxygen[x] = [n for n in oxygen[x] if not isinstance(n,int)]
x += 1
van = [x for x in range(0,len(van))]
x = 0
while x < len(van):
van[x] = s[van[x]].coords
x += 1
van = [np.array(x) for x in van]
x = 0
while x < len(van):
oxygen[x] = [np.subtract(oxygen[x][y],van[x]) for y in range(0,len(oxygen[x]))]
x += 1
combo = [[0 for x in range(0,1000)] for y in range(0,len(van))]
r = 0
while r < len(van):
x = 0
for subset in iter.combinations(oxygen[r],2):
combo[r][x] = subset
x += 1
r += 1
x = 0
while x < len(combo):
combo[x] = [c for c in combo[x] if c != 0]
x += 1
angles = [[0 for x in range(0,1000)] for y in range(0,len(van))]
x = 0
while x < len(combo):
group = combo[x]
y = 0
while y < len(group):
angles[x][y] = math.degrees(math.acos(np.dot(group[y][0],group[y][1])/(np.linalg.norm(group[y][0])*np.linalg.norm(group[y][1]))))
y += 1
angles[x] = [round(n,3) for n in angles[x] if n != 0 and n > amin and n < amax]
x += 1
angles = np.concatenate(angles,axis=0)
return angles