Course Elementary 20264
Course Introduction:PHP array functions allow you to access and manipulate arrays, supporting single-dimensional and multi-dimensional arrays. Array functions are a core part of PHP. No installation is required to use these functions. "PHP Function: Array Array Function Video Explanation" explains the syntax, parameters, return values, etc. of PHP array functions, and provides examples of functions through the PHP editor to help PHP learners better understand and use array functions.
Course Elementary 8895
Course Introduction:In any programming language, arrays are a very important data organization type. Especially in PHP, the functions of arrays are more powerful. PHP has a large number of preset array functions, which greatly facilitates the development work of PHP programmers. . This course selects different types of very representative array functions to show everyone the charm of arrays in PHP~~
Course Intermediate 10914
Course Introduction:"Self-study IT Network Linux Load Balancing Video Tutorial" mainly implements Linux load balancing by performing script operations on web, lvs and Linux under nagin.
Course Advanced 16852
Course Introduction:"Shangxuetang MySQL Video Tutorial" introduces you to the process from installing to using the MySQL database, and introduces the specific operations of each link in detail.
Two-dimensional array merges one-dimensional array
$arr = array(2) { [0]=> array(3) { [0]=> string(1) "1" [1]=>
2019-03-04 16:17:05 1 4 1270
Merge/flatten an array of arrays
2023-08-27 12:05:43 0 2 476
How to create an array within an array?
2024-04-01 22:05:34 0 1 338
2023-09-03 14:08:19 0 1 506
2023-08-15 17:00:37 0 1 495
Course Introduction:Sparse representation is a method for data representation and dimensionality reduction, and is widely used in fields such as computer vision, natural language processing, and signal processing. This article will introduce models and algorithms based on sparse representation, including sparse coding, dictionary learning, and sparse autoencoders. Through sparse representation, we can effectively capture important features in data and achieve efficient data processing and analysis. The principle of sparse representation is to achieve data compression and dimensionality reduction by minimizing the sparse representation coefficient of the data. Sparse coding and dictionary learning are commonly used methods in sparse representation. They can 1. Sparse coding Sparse coding is a method that utilizes linear transformation to represent the original data as a linear combination of a set of sparse coefficients. Suppose there is a set of vectors x, and we want to use a set of linear basis vectors D
2024-01-22 comment 0 474
Course Introduction:In this article, we will show you what a sparse matrix is and how to create a sparse matrix in python. What is a sparse matrix? A sparse matrix is a matrix in which most elements are 0. That is, the matrix contains data for only a few locations. Most of the memory consumed by a sparse matrix consists of zeros. For example -M=[[1,0,0,0],[0,0,3,0],[0,0,0,0],[0,0,0,2]] uses a two-dimensional array to Representing a sparse matrix wastes a lot of memory because the zeros in the matrix are useless in most cases. So instead of storing zero along with non-zero elements, we store only non-zero elements. This involves using triples to store non-zero elements (row, column, value). Natural Language Processing (NLP)
2023-09-05 comment 0 1180
Course Introduction:In a given matrix, when most of the elements are zero, we call it a sparse matrix. For example - 3x3 matrix 110002000 In this matrix, most of the elements are zeros, so it is a sparse matrix. Question checks if a matrix is sparse. Solution Let's assume that the zeros in the matrix are greater than (number of rows * number of columns)/2. Then, this matrix is a sparse matrix, otherwise it is not. ProgramThe following is a program to check whether a given matrix is a sparse matrix: Demonstration #include<stdio.h>#include<stdlib.h>intmain(){ intr
2023-08-27 comment 0 568
Course Introduction:A matrix is a rectangular array in which a set of numbers are arranged in rows and columns. It is called mXn matrix where m and n are dimensions. If a matrix contains fewer non-zero elements than zero elements, it is called a sparse matrix. [0,0,3,0,0][0,1,0,0,6][1,0,0,9,0][0,0,2,0,0]The above matrix is a 4X5 matrix , most of the numbers here are zero. Only a few elements are non-zero, so we can treat it as a sparse matrix. To check if a given matrix is sparse, we need to compare the total number of elements and zeros. If the number of zero elements exceeds half of the elements in the matrix. Then we can call the given matrix as sparse matrix. (m*n)/2 Let us discuss determining whether a given matrix is
2023-09-05 comment 0 1351
Course Introduction:Generally speaking, arrays in JavaScript are sparse, that is, there can be gaps between elements in the array, because an array is actually a key-value map. This article explains how to create sparse arrays and non-sparse arrays
2016-05-16 comment 0 1178