• Python crawled through the commodity data of Amoy data platform and found that the wig market was so hot


    preface The text and pictures of this article come from the network, only for learning and communication, and do not have any commercial purpose. If you have any questions, please contact us in time for handling.       Recently, I found a good data website called “Amoy data”. The data inside are the merchant […]

  • JavaScript ES6 can sort an object array according to another object array


    With the help of this blog, we have realized the functions we needhttps://www.cnblogs.com/guojbing/p/10872867.html Suppose you have an array of objects: const arr1 = [ {buyerId: “1”, name: “WW”}, {buyerId: “2”, name: “RR”}, {buyerId: “3”, name: “OO”}, {buyerId: “4”, name: “ll”}, {buyerId: “5”, name: “DD”}, {buyerId: “6”, name: “SS”} ] Another object array is: const arr2 […]

  • R language linear regression and time series analysis: a case study of influencing factors of housing prices in Beijing


    Link to the original text:http://tecdat.cn/?p=21467  objective Data on house prices may reflect changes in China in recent years: People get more resources (salaries) and expect better houses populous One child policy: how to affect the geometric structure of the house? More bedrooms, more space My core idea is to forecast house prices. However, I’m not […]

  • What is the difference between direct and indirect foreign exchange pricing?


    In recent years, foreign exchange investment has attracted many people because of its considerable benefits. People who invest in the foreign exchange market should be familiar with the direct and indirect pricing of foreign exchange. Let’s see the difference between them today, What is the difference between direct price and indirect price? Direct pricing method, […]

  • Heston model for option pricing in R language


    Link to the original text:http://tecdat.cn/?p=12111 In this article, I will show you how to simulate the Heston stochastic volatility model of stock price. Heston model is an option valuation method, which takes into account the volatility of different options traded in the same asset at a given time. It attempts to recreate market pricing by […]

  • Combine table and calendar of elementui to make a price calendar


    In the project, we need to make a price calendar to display and modify the date and price. Let’s take a look at the final effect first, and then use the table and calendar of elementui to realize it. Let’s take a look at the main code (the code only retains the main code and […]

  • Algorithm – how to get the maximum profit from stock trading


    As a leek who has earned several months’ salary from sideline business, he obviously has a lot of interest in this kind of problem, but in practice, what he often doesn’t know is the future price of the stock, so he needs to predict. In fact, your firm offer will also affect the stock in […]

  • C # standard event flow


    Changes in clothing prices trigger Taobao’s publishing activities and the event flow of consumers buying clothes public class EventStandard { public class Clothes { /// ///Clothing code /// public string Id { get; set; } /// ///Clothing name /// public string Name { get; set; } /// ///Clothing price /// private double _price; public double […]

  • How to choose a good website


    Nowadays, there are all kinds of CS websites on the Internet, which makes customers a little difficult. There are many related websites, I don’t know how to choose. Since you don’t know how to choose, it’s better to consider according to the following characteristics, and strive to choose a formal proxy website.A good CS website […]

  • Explain the highlights of iPhone 12 series mobile phones, and you will know whether it is worth buying


    The absence of the iPhone 12 Series in Apple‘s autumn launch in September has greatly increased the appetite of Apple fans. However, due to the “postponement” of the release, the configuration of the new iPhone has long been guessed, such as 5g and 5nm chips, and even the names and models of four mobile phones. […]

  • Regular expression of matching price in JavaScript


    Copy codeThe code is as follows: /^(d*.d{0,2}|d+).*$/ The test code given by hansir is as follows: Copy codeThe code is as follows: <!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”> <html xmlns=”http://www.w3.org/1999/xhtml”> <head> <meta http-equiv=”Content-Type” content=”text/html; charset=gb2312″ /> < title > Untitled Document<script type=”text/javascript”> function checkPrice(me){ if(!(/^(?:d+|d+.d{0,2})$/.test(me.value))){ me.value = me.value.replace(/^(d*.d{0,2}|d+).*$/,’$1′); } } </script> </head> <body> […]

  • Vue2 + elementui form association verification


    Recently, the project has a form linkage verification requirementAs shown in the figure above, the form must satisfy the requirement that the Commission cannot be greater than the priceFirst write the rules of validation function and data let validatePrice = (rule, value, callback) => { if (!value) { Callback (new error (‘Please enter the price […]