Intializing three dimensional array in python with predefined values as -1

Question

In c/c++ we use to declare three-dimensional using the following syntax.

`long long dp[20][180][2]; `
 memset(dp, -1, sizeof(dp));

My code:

import numpy as np
x = np.zeros((20,180,2))

How can we declare and initialize a three-dimensional array in python?

Does this answer your question? [initialize a numpy array](https://stackoverflow.com/questions/4535374/initialize-a-numpy-array) — rpb, Mar 05 '21 at 14:15
x = -np.ones(920,180,2))` or `x = np.zeros((20,180,2))-1` also do this. Once you have an array, doing simple math on it is fast and easy. — hpaulj, Mar 05 '21 at 16:58

score 1 · Accepted Answer · answered Mar 05 '21 at 14:13

1

If you want all the values initialized to -1 like in your memset example, then you'd want np.full instead of np.zeros

import numpy as np
x = np.full((20,180,2), -1)

answered Mar 05 '21 at 14:13

Cory Kramer

1 Answers1