Category "arrays"

update objects in array with useState (reactJS)

Go to the end of this question for the solution that worked for me! i'm currently making my own chess game and i want to check if a position already occurred 3

Numpy array of tuples to PIL image

I currently have a numpy array or RBG tuples that I want to convert to a PIL image and save. Currently I'm doing the following: final = Image.fromarray(im_arr,

How to add a comma in array.map after every element except last element in React JSX

How can I add a trailing comma after every element of an array for making a list like: INV, INV, INV, INV Note that the last element doesn't have a trailing c

Merge JavaScript objects in array with same key

What is the best way to merge array contents from JavaScript objects sharing a key in common? How can array in the example below be reorganized into output? Her

Merging 4 sorted Arrays into one

I have this method to merge 2 sorted arrays into one sorted array: public void merge(T[] a, int l1, int r1, T[] b, int l2, int r2, T[] c, int l3) {

Inserting array values

How do I write and execute a query which inserts array values using libpqxx? INSERT INTO exampleTable(exampleArray[3]) VALUES('{1, 2, 3}'); This example code

Copying Character array into char array

Hi I want to fast copy array of Characters to array of chars I can write a method that copies Character array into char array, by converting every Charater in a

numpy arange: how to make "precise" array of floats?

In short, the problem I encounter is this: aa = np.arange(-1., 0.001, 0.01) aa[-1] Out[16]: 8.8817841970012523e-16 In reality, this cause a series problem si

Date showing as serial number in formula

I'm currently having an issue with the date format. I have basically extracted the month and year from a standard dd/mm/yyyy date and wish this to be formatted

Javascript twoSum algorithm: Given an array of integers, return indices of the two numbers such that they add up to a specific target

Given an array of integers, return indices of the two numbers such that they add up to a specific target. Example: Given nums = [3, 2, 4], target = 6, Because

Group rows by column and sum another column within groups [duplicate]

I have an array looking like: array(480) { [0]=> array(2) { ["tag_id"]=> string(4) "6291" ["az"]=> int(5) } [

Find the first and last element of a NumPy array larger than a threshold

I need to find the first and the last element of a numpy.ndarray which are above a specified threshold. I found the following solution, which works, but it look

algorithm to merge two arrays into an array of all possible combinations

Example given in JavaScript: Suppose we have two arrays [0,0,0] and [1,1,1]. What's the algorithm to produce all possible ways these two arrays can be combine.

Calculate the sum of values within an array of objects [duplicate]

I am trying to find the total sum for each item sold inside an array, like so: The array looks like this: [ { 'Some Title Item', '22',

"Notice: Undefined variable", "Notice: Undefined index", "Warning: Undefined array key", and "Notice: Undefined offset" using PHP

I'm running a PHP script and continue to receive errors like: Notice: Undefined variable: my_variable_name in C:\wamp\www\mypath\index.php on line 10 Notice: U

Is there a way to concatenate two arrays in Excel without VBA? [duplicate]

I am trying to create a formula that returns the concatenation of two arrays of different lengths. I need this concatenation for part of anoth

Create li from loop through array and display to HTML as a list

I am learning javaScript and I want to loop array and display to HTML as a list. How can I do that? Array: var array = ['Slide 1', 'Slide 2', 'Slide 3', 'Slid

I want to create a 30x30 matrix array of 1s and 0s

I want to create a 30x30 matrix array of 1s and 0s. This will be a maze with 1's being the path and 0's being a wall. but this labyrinth should contain a way gu

Chunk and transpose a flat array into rows with a specific number of columns

An array of values are provided in the order they should appear in columns. For example, the second value in the array should be displayed on a webpage beneath

Typescript filter array based on value from another array

This question has been asked many times, but I can't get it working. I have two arrays, the first one is: first= [ { id:1, descrizione: "Oggetto