# Tag: arrays

## Dynamically changing a list while looping

I have a list: what I would like to do is loop though this list but then change the list. Basically when I loop through nums = [0, 1, 2, 3] nums would need to change to: Is there a way of changing nums like this? I feel like there is a simple solution to this, but I’ve been stumped

## How to create a numpy 2-D array whose elements depend on elements of two lists already fixed

Example: Let and I would like to create a matrix C of size (5,5) whose elements are where f is a fixed function for example f(x,y) = x*y + x + y which means In the case where c_ij depends on i and j only and does not depend on the lists A and B, we can use np.fromfunction(lambda i,j:

## Finding location of subarray in numpy array

I want to find the location of a subarray in an numpy array. For example, if the large array is of shape (10000, 10, 10, 10), namely 10000 arrays of shape (10,10,10) and I want to find the location of the subarray of shape (3,3,3) as follows: So I will know that at the location of n, i, j, k

## How to get standard deviation across multiple 2d arrays by cell?

I have 16 2d-arrays, each in a shape of [16000, 16000], which means one array has 256000000 cells. I want to have a std_array that is the standard deviation of each cell in the 16 arrays. I tried something but failed, and my questions are in bold. Here’s my attempt. For example (simplified 3*3 arrays): However, the np.std function only

## Cannot Change Individual Elements in an Array

I am trying to make a tic-tac-toe game, and I currently have a 3×3 tiled board grid to represent the game. When a user clicks a square, the program sets board[x][y] to 1. board = [[[0, 0, 0], [0, 0, 0], [0, 0, 0]] Unfortunately, whenever I click a tile, it seems to ignore whatever x value I put; every

## How to update key of dictionary inside a JSON file?

This is an example of what’s in my JSON file: How would I change the male’s key (which is 0) and add one using “+=” in python? I wan a command to update the key of male or female. I don’t want to CHANGE 0 into 1, but I want to “+=” to that 0 so that I can update

## Does a JS equivalent of Python’s Multiple Variable Assignment exist?

Python has a succinct way of assigning a function with a parameter to multiple variables, done as a one-liner. I would like to know whether JavaScript has the same, or similar way of doing that. I have found several examples describing multiple variable assignments for JavaScript, using multiple assignments and Destructuring. The issue with these methods is that they can,

## Why is this array changing when I’m not operating on it?

I have two arrays: And I’m running the foll)owing code: I get the following result: Why are the last elements changed? I don’t see why X is changed by indexing some elements. edit: added np.array Answer Output:

## How do I find the highest float from a list?

I have made a program that gets a movie you pick from a list and tells you its directors and rating it also tells you if a movie is the highest-rated. I want the program to do the same thing it is doing but instead of just checking if the title is 5 stars, it checks if the rating is

## Creating 3d Tensor Array from 2d Array (Python)

I have two numpy arrays (4×4 each). I would like to concatenate them to a tensor of (4x4x2) in which the first ‘sheet’ is the first array, second ‘sheet’ is the second array, etc. However, when I try np.stack the output of d is not showing the correct values of the first matrix. Answer If you do np.dstack((x, y)), which