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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: There's a DataFrame in pyspark with data as below: user_id object_id score user_1 object_1 3 user_1 object_1 1 user_1 object_2 2 user_2 object_1 5 user_2 object_2 2 user_2 object_2 6 What I expect is returning 2 records in each group with the same user_id, which need to have the highest score. Consequently, the result should look as the following: user_id object_id score user_1 object_1 3 user_1 object_2 2 user_2 object_2 6 user_2 object_1 5 I'm really new to pyspark, could anyone give me a code snippet or portal to the related documentation

CS917 Coursework 1 Deadline: Monday week 6 (4 November) at 12.00 noon. Please read the entire sheet before starting on Part A. Background Through lectures and exercise sheets you have gained some useful experience of the multi-paradigm programming language Python. In this coursework we would like you to use this knowledge to solve a number of real-world problems based on the analysis of company stock data. The dataset that you will be using is taken from the Financial Times Stock Exchange 100 Index (the FTSE 100). This lists the 100 companies registered on the London Stock Exchange with the

ACIT 3910 Database Administration and Management Assignment #2 Patrick Guichon March 9, 2019 1 of 14 ACIT 3910 Database Administration and Management Assignment #2 ACIT 3910 Database Administration and Management Assignment #2 Patrick Guichon March 9, 2019 2 of 14 Introduction: For this assignment you will be creating a new database in MySQL. The database will be a small school database with students, teachers and the courses they attend. We will create views for commonly used queries and we will use users, roles and privileges to ensure students can log in, but only see their information (and

JIT104 Building IT Systems Fall, 2019 CRICOS 00213J Page 1 Take-Home Task 1: Bubble Charts (Weight: 20%. Due: Friday 18 October 2019) Overview This is the take home task is worth 20% of your final grade for this unit. Motivation One of the most basic functions of any IT system is to process a given data set to produce some form of human-readable output. This task requires you to produce a visual image based on data stored in a list. It tests your abilities to: • Iterate through sequences of data values; • Perform arithmetic operations; • Display information in a visual form; and • Produce

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm just beginning to learn the concept of threading, and I'm kind of stuck at this one problem, its driving me crazy.... What I actually need to accomplish - I have some 300 text files in a local directory, that need to be parsed for specific values... After I find these "values" in each text file, I need to store them in a database.. So I followed the plain approach of accessing each text file in the directory - parsing and updating the resulting values as a row to a local DataTable, and when I'm done parsing all the files and storing 300

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: i have 2 table with this structure Products id title ----------------- 1 sample 1 2 sample 2 3 sample 3 4 sample 4 5 sample 5 6 sample 6 gallery id typeid name ------------------------------- 1 1 sample for 1 2 1 sample for 1 3 1 sample for 1 4 2 sample for 2 5 2 sample for 2 7 2 sample for 2 8 3 sample for 3 9 3 sample for 3 10 3 sample for 3 11 4 sample for 4 12 4 sample for 4 13 5 sample for 5 14 5 sample for 5 and iwant this for lists of id eg(1,2,3) id typeid name --------------------- 1 1 sample for 1 1 2 sample for 1 2 4 sample for 2

I'm looking at a jQuery plugin, which has a single function. After setting up the appropriate defaults though a constructor argument the function defines a couple of helper functions, and then as the last part returns a call to this.each(), like so: return this.each(function() { //long method defined here }); I understand the use of this.each() in modifying matching DOM elements and such, but what does the return statement accomplish? Some sort of array of modified DOM elements, which can then be chained in other calls? I've read about this.each on this site but I can't quite figure what the

When using the jQuery "each" function, is there a way to pass arguments to the function that is called ? something.each(build); function build(vars) { } I know that I can simply do the following, but I was wondering if there is a way in which arguments can be passed directly. something.each(function() { build(vars); ); You can accomplish the above using a closure. The .each function takes as an argument a function with two arguments, index and element. You can call a function that returns a function that takes those two arguments, and store variables in there that will be referenced when the