A tree array is a data structure used to efficiently maintain the prefix sum of an array. It can complete single point modification and interval query operations in O(logn) time. The core idea of a tree array is to decompose the array into several small intervals, and the sum of each small interval can be […]
Tag: indexed
How to achieve front-end data persistence (LocalStorage, IndexedDB, etc.)?
Gathering sand into a tower, making a little progress every day ? Column introduction Front-end Getting Started Tour: Exploring the Wonderful World of Web Development Welcome to the Front-End Getting Started Tour! If you are interested, you can subscribe to this column! This column is tailor-made for those who are interested in web development and […]
Yolov7 reports an error that indices should be either on cpu or on the same device as the indexed tensor (cpu) solution
Question Error message Traceback (most recent call last): File “/usr/local/code/yolov7_pytroch/yolov7/train.py”, line 616, in <module> train(hyp, opt, device, tb_writer) File “/usr/local/code/yolov7_pytroch/yolov7/train.py”, line 363, in train loss, loss_items = compute_loss_ota(pred, targets.to(device), imgs) # loss scaled by batch_size File “/usr/local/code/yolov7_pytroch/yolov7/utils/loss.py”, line 585, in __call__ bs, as_, gjs, gis, targets, anchors = self.build_targets(p, targets, imgs) File “/usr/local/code/yolov7_pytroch/yolov7/utils/loss.py”, line 759, […]
how-to-use-indexeddb-to-store-data-for-your-web-application-in-the-browser-1o90
Original address: https://dev.to/alexeagleson/how-to-use-indexeddb-to-store-data-for-your-web-application-in-the-browser-1o90 If you want to fork this project, the code and tutorials can be found on [Github](https://github.com/alexeagleson/template-indexeddb). If you are interested in a video version of this tutorial, check out the link below. You can track it using the code in this blog post. (This video is completely optional, each step and instruction […]
Talk about the front-end local storage indexedDB
Foreword Presumably front-end resource utilization is also a technology often used in our daily work. Among them, the most commonly used ones are cookies and Web Storage (sessionStorage, localStorage). However, these localized storage methods have obvious shortcomings, such as: 1.Cookie: no more than 4kb in size, sent back to the server with each request 1. […]
A preliminary study on the browser database IndexedDB
Directory ?Foreword ?Through train ?Introduction to indexedDB ? IndexedDB features 1. Non-relational database (NoSql) 2. Persistent storage 3. Fully asynchronous operation 4. Support affairs ?Analysis of program advantages and disadvantages advantage shortcoming Reading and writing speed test ?Common operations of indexedDB (demo) Create database Insert data Read data Primary key read Cursor read index read […]
BindingProxy: Binding to indexed property
I have a BindingProxy that binds the visibility-property of a DataGrid’s DataGridColumns to a value in a dictionary (“ColumnsVisibility”). I also have a context menu which is supposed to hide/show the columns of the grid. <DataGrid Name=”dgMachines” ItemsSource=”{Binding HVMachineList, UpdateSourceTrigger=PropertyChanged}” AutoGenerateColumns=”False” > <DataGrid.Resources> <local:BindingProxy x:Key=”proxy” Data=”{Binding}”/> <ContextMenu x:Key=”DataGridColumnHeaderContextMenu”> <MenuItem Header=”Names”> <CheckBox Content=”Name” IsChecked=”{Binding Data.ColumnsVisibility[ElementName], Source={StaticResource […]
Play with IndexedDB, a local cache on the web page that is more powerful than localStorage and cookies
As the functionality of browsers continues to increase, more and more websites begin to consider storing a large amount of data on the client, which reduces the need to obtain data from the server and directly obtains data locally. Existing browser data storage solutions are not suitable for storing large amounts of data: the size […]
Encapsulation and use of indexedDB
New indexedDB.js // Adapt to different browsers const indexedDB = window.indexedDB || window.webkitIndexedDB || window.mozIndexedDB; // new class class IndexedDBCache {<!– –> constructor () {<!– –> this._db = null; // database this._transactionRead = null; // read transaction this._transactionWrite = null, // write transaction this._request = null; this._dbName = “logDB”; //Database name this._cacheTableName = “logTable”; //table […]
m Performance matlab simulation analysis of indexed OFDM modulation and demodulation system based on DM-OFDM-IM technology
Directory 1. Algorithm simulation effect 2. Algorithms involve an overview of theoretical knowledge 2.1 OFDM-IM index modulation system 2.2 DM-OFDM-IM index modulation system 3. MATLAB core program 4. Complete algorithm code file 1. Algorithm simulation effect The matlab2022a simulation results are as follows: 2. Summary of theoretical knowledge involved in algorithms With the continuous development […]