Biophysics - 5 months ago 15

Python Question

I have edited my question. Now I don't want to use loop in my function. The function is for defining initial position of an rotating object in 2-D. I would like to get the output format like this:

`theta1 theta2 theta3`

phi1 phi2 phi3

eta1 eta2 eta3

The definition of e inside the function must be something else (my opinion). Can anyone help me to get my desired output?

`def randposi(N=500):`

theta = 2*pi* rand()-pi

phi = arccos(1-2* rand())

eta = 2*pi*rand()-pi

r = random.rand(N)

e = 3*r*array()

return e

Answer

What about using a random numpy array ?

Something like that:

```
import numpy as np
N=500
#we create a random array 3xN
r = np.random.rand(3,N)
#tetha is row 0, phi row 1, eta row 2
#we apply some treatment to get the right range
r[0]=2*np.pi*r[0] -np.pi
r[1]=np.arccos(2*r[1] -1)
r[2]=2*np.pi*r[2] -np.pi
print(r[0],r[1],r[2])
```