Python RuntimeError: 'float' object is not iterable - 解决方法

The error message indicates that there is a TypeError in the line where the zip() function is used. The error occurs because one of the variables being passed to zip() is a float object instead of an iterable.

To fix this issue, you need to ensure that both eta_at_list and eta_cos_values_list are iterable objects. Make sure that these variables are defined as lists or arrays before using them in the zip() function.