Calculations with 3 differents list-CodePudding

I am with a problem with calculations with 3 differents list.

I have this lists:

center_x= [1.340, 8.54065065, 3.718, 5.83]
center_y= [1.672, 1.67, 7.47, 4.71]
center_z= [-0.451, -1.389, 7.523, 8.15]

Each list has a spatial coordinate, that is, center_x[1], center_y[1], center_z[1], form a coordinate of type (x,y,z).

I need to calculate the distances between these coordinates, like this pairs 1-2, 2-3, 3-4 . I tried like this:

for i in range(len(centro_x)):
    print( 'Dists :',(( ((center_x[i 1]-center_x[i]**2)  center_y[i 1]-center_y[i]**2)  (center_z[i 1]-center_z[i]**2)) **(1/2)) )

But only be able to calculate for the first pair, 1-2.

And than obtain this error:

dist 3.0513998021801334
dist (6.261343210163308e-16 10.225549463768164j)
dist (6.351600500021062e-16 10.372950804171936j)
Traceback (most recent call last):
File "/home/josepinto/Desktop/quadrangular/auxiliar.py", line 81, in <module>
print(  'dist',(( ((centro_x[i 1]-centro_x[i]**2)  centro_y[i 1]-centro_y[i]**2)  
(centro_z[i 1]-centro_z[i]**2)) **(1/2)) )
IndexError: list index out of range

Someone can help me? Thanks

CodePudding user response：

The parenthesis are placed wrong and the range of your for loop is slightly mistaken to compute the distances between coordinates:

centro_x= [1.340, 8.54065065, 3.718, 5.83]
centro_y= [1.672, 1.67, 7.47, 4.71]
centro_z= [-0.451, -1.389, 7.523, 8.15]

for i in range(len(centro_x)-1):
    print( 'Dists :',((centro_x[i 1]-centro_x[i])**2   (centro_y[i 1]-centro_y[i])**2  (centro_z[i 1]-centro_z[i])**2) ** (1/2)  )

Since you are using i 1 in your print statement the error is thrown when it gets to the last element in centro_x, as i 1 from there does not refer to a valid position in the array; hence the error

Eventually, you could use the numpy.linalg.norm to compute the distance without a for loop

centro_x= [1.340, 8.54065065, 3.718, 5.83]
centro_y= [1.672, 1.67, 7.47, 4.71]
centro_z= [-0.451, -1.389, 7.523, 8.15]
import numpy as np
centro= np.array([[1.340, 8.54065065, 3.718, 5.83],[1.672, 1.67, 7.47, 4.71],[-0.451, -1.389, 7.523, 8.15]])
dist = np.linalg.norm(np.diff(centro),axis=0)
print(dist)

CodePudding user response：

You get this error because of the 1 in the index try:

for i in range(1,len(center_x)):
    print( 'Dists :',(( ((center_x[i-1]-center_x[i]**2)  center_y[i-1]-center_y[i]**2)  (center_z[i-1]-center_z[i]**2)) **(1/2)) )

my code:

center_x= [1.340, 8.54065065, 3.718, 5.83]
center_y= [1.672, 1.67, 7.47, 4.71]
center_z= [-0.451, -1.389, 7.523, 8.15]
for i in range(1,len(center_x)):
    print( 'Dists :',(( ((center_x[i-1]-center_x[i]**2)  center_y[i-1]-center_y[i]**2)  (center_z[i-1]-center_z[i]**2)) **(1/2)) )

CodePudding user response：

You're out of range IndexError: list index out of range since you start with first index [0] and reach the 5th index [4] which is not in the list. So you have to change this line

for i in range(len(center_x)):

for i in range(len(center_x) - 1):

another hint: there's a parenthesis problem placed here in the formula you wrote, which need to be written correctly to avoid miscalculations.