Python

Question

How to get position a number(for example 23) in matrix(list in list) python

Answer 1

Mohammad , do you mean a python list or a numpy array?

Answer 2

Mohammad , when you can present us your attempt, we can help you with a solution.

Until then, I give you some hints:

- use a nested for loop for the outer and the inner list
- in the outer loop, also use an enumerator to get its index position
- in the inner loop. check if the value you are looking for is a member of the inner list
- if yes, get its index by using the index() method, print the positions you have as [ndx1][ndx2]

Answer 3

Lothar For example i want to get position of 23 in this matrix:
[[14,17,11],[10,23,42],[20,13,71]]

Answer 4

Mohammad
23 in your list will be: lst[1][1]

Nested list example showing index's:
[[0,1,2],[0,1,2],[0,1,2]]

Answer 5

you can use numpy.where like this:

arr = np.array([[14,17,11],[10,23,42],[20,13,71]])
print(*zip(*np.where(arr == 23)))
# (1, 1)