random

软件工程网络15结对编程作业

那年仲夏 提交于 2020-01-25 02:42:21
项目成员:林楚虹 201521123002 + 林艺如 201521123004 码云地址:https://gitee.com/dabao_lyr/software_engineering 1. 改进现有代码 分析网络14部分现有程序代码(请选择其中一个) 选择:个人博客地址5:http://www.cnblogs.com/NianQiFeng ,源代码:https://git.coding.net/qwx_hh/java-szys.git 原题目要求 http://www.cnblogs.com/happyzm/p/6472120.html 逻辑泥球 原代码在构建错题复习的功能中,无法进入到文件中读取错题。 重构 1.clone项目,在开发环境中运行该应用程序,修改完毕最后上传至码云,并在博客中给出链接 https://gitee.com/dabao_lyr/software_engineering 代码规范也已上传 2.检查大部分主要类之间的关系,画出类图 图片来源:http://www.cnblogs.com/NianQiFeng/p/6551489.html 3.代码覆盖率 4.当前程序是否支持多个操作符运算,如果不支持,请在源代码基础上进行改进,算法参考:https://www.cnblogs.com/dragondove/p/6445850.html 支持多个操作符运算

Display multiple choice questions in a random order

[亡魂溺海] 提交于 2020-01-24 22:56:05
问题 Below is the code that displays multiple choice questions sequentially. It displays a question, gets the answer and checks for correctness. public static void Rap() { Scanner input = new Scanner(System.in); int correct = 0; //1 System.out.println("Complete the lyrics(hint travis scott): 'dont you open up that... \n A.can of coke \n B.window \n C. back door \n D. water bottle "); String x = input.next(); if (x.equalsIgnoreCase("b")) { System.out.println("Correct"); correct++; } if (x

How do you unit test code that relies on randomly generated numbers?

£可爱£侵袭症+ 提交于 2020-01-24 22:11:06
问题 What is the best way to unit test code that relies on you randomly generating data? I found this question on stack overflow but it is a little different. I know that you can use fixtures to mock out something like a database but I think that what I'm trying to do is a little different. I'm trying to write an adaline neural network. This requires me to randomly generate weights and then the values for the weights are adjusted as more data is presented to the network. How do I unit test

How to create 10 random rasters in R?

不羁岁月 提交于 2020-01-24 21:26:05
问题 I am looking to generate several random raster in a loop that I plan to store. I tried something (below) that but it does not work: r1= raster(nrows = 1, ncols = 1, res = 0.5, xmn = -1.5, xmx = 1.5, ymn = -1.5, ymx = 1.5, vals = 0.3) a<- 10 for (i in 1:length(a)){ values(r1[i]) = round(runif(ncell(r1[i]), 0, 1))} Thanks for any help. 回答1: There's a much simpler way: library(raster) r1 <- raster(nrows = 1, ncols = 1, res = 0.5, xmn = -1.5, xmx = 1.5, ymn = -1.5, ymx = 1.5, vals = 0.3) rr <-

day07_Scanner类、Random类、ArrayList 类

大城市里の小女人 提交于 2020-01-24 10:24:24
API 概述 API(Application Programming Interface),应用程序编程接口。Java API是一本程序员的 字典 ,是JDK中提供给我们使用的类的说明文档。这些类将底层的代码实现封装了起来,我们不需要关心这些类是如何实现的,只需要学习这些类如何使用即可。所以我们可以通过查询API的方式,来学习Java提供的类,并得知如何使用它们。 API使用步骤 打开帮助文档。 点击显示,找到索引,看到输入框。 你要找谁?在输入框里输入,然后回车。 看包。java.lang下的类不需要导包,其他需要。 看类的解释和说明。 学习构造方法 使用成员方法/变量 引用类型使用步骤 类属于引用类型中的一种,所以去使用步骤符合引用类型的使用步骤。 1:导包 使用import关键字导包,在类的所有代码之前导包,引入要使用的类型,java.lang包下的所有类无需导入。 格式: 2:创建对象 使用该类的构造方法,创建一个该类的对象。 格式: 3:调用方法 调用该类的成员方法,完成指定功能。 格式: // 接收一个键盘录入的整数 int i = sc.nextInt(); Scanner类 Scanner使用步骤 查看类 java.util.Scanner :该类需要import导入后使用。 查看构造方法 public Scanner(InputStream source) :

机器学习读书笔记(七):Combining Different Models for Ensemble Learning

家住魔仙堡 提交于 2020-01-23 18:23:44
机器学习读书笔记(七):Combining Different Models for Ensemble Learning Ensemble Learning Introduction Majority voting (plurality voting) Implementating a simple majority classifier Let's do this by Python! Let's use it in practice! Evaluating and tuning the ensemble classifier Compute a ROC curve from the test set Plot the decision region Grid Search Bagging: for bootstrap sample Leveraging weak learners via adaptive boosting Basic concepts: Now let's concentrate on the star today: **Adaboost** Summary 学习目标: Making predictions based on majority voting . Reduce overfitting by drawing random combinations

Random number generator performance varies between platforms

亡梦爱人 提交于 2020-01-23 17:39:06
问题 I am testing the performance of random number generators in c++ and have come upon some very strange results that I do not understand. I have tested std::rand vs std::uniform_real_distribution which uses std::minstd_rand. Code for timing std::rand auto start = std::chrono::high_resolution_clock::now(); for (int i = 0; i < 1000000; ++i) std::rand(); auto finish = std::chrono::high_resolution_clock::now(); std::chrono::duration<double> elapsed = finish - start; std::cout << "Elapsed time: " <<

持续构建:使用Docker镜像方式构建go语言项目

萝らか妹 提交于 2020-01-23 08:45:35
go官方提供了各种版本的镜像,在Easypack中根据官方的Alpine镜像也创建go语言的镜像,因为go 1.13开始GOPROXY 默认为 https://proxy.golang.org,将GOPROXY缺省设定为goproxy.cn,以方便更简单地使用go镜像进行构建。 golang官方镜像 官方镜像分如下三类: 普通镜像: golang:<version> Alpine镜像: golang:<version>-alpine Windows镜像: golang:<version>-windowsservercore 详细可参看:https://hub.docker.com/_/golang Easypack的Alpine镜像 镜像tag: golang:<version>-alpine 下载镜像 下载镜像:docker pull liumiaocn/golang:1.13.5-alpine3.11 编译go语言应用 这里以Prometheus提供的go语言的示例应用(为Prometheus提供可供抓取的数据)为例进行说明如何使用Docker镜像进行go语言应用的编译。 准备go语言应用 执行命令:git clone https://github.com/prometheus/client_golang.git 当然也可以直接使用自己手头已有的go语言的应用示例进行编译。

Is there a scope for (numpy) random seeds?

不想你离开。 提交于 2020-01-23 07:48:32
问题 My question is related to What is the scope of a random seed in Python? . In the case of above question, it is clarified that there is a (hidden) global Random() instance in the module for random . 1) I would like to clarify whether setting the random seed in one module will cause this to be the random seed in other modules and whether there are certain things to be aware of. For instance: Given: moduleA.py, moduleB.py moduleA.py: import random import moduleB random.seed(my_seed) moduleB

Is there a scope for (numpy) random seeds?

旧时模样 提交于 2020-01-23 07:48:23
问题 My question is related to What is the scope of a random seed in Python? . In the case of above question, it is clarified that there is a (hidden) global Random() instance in the module for random . 1) I would like to clarify whether setting the random seed in one module will cause this to be the random seed in other modules and whether there are certain things to be aware of. For instance: Given: moduleA.py, moduleB.py moduleA.py: import random import moduleB random.seed(my_seed) moduleB