Sequence

Creating a sequence of dates with a special format

微笑、不失礼 提交于 2020-08-03 09:14:57
问题 I was wondering how I could create a sequence of dates in the following format: from "Jul 23 10:20" to "Jul 30 10:25" by "1" day? I tried the following without sucess: seq.Date(as.Date("Jul 23 10:20"), as.Date("Jul 30 10:25"), length.out = 7) 回答1: To preserve times you should convert to actual date-times, from which it is easy to build a sequence increasing by 1 day at a time. You can use strftime to format this as you please. strftime(seq(as.POSIXct("2020-07-23 10:20"), by = "1 day", length

Creating a sequence of dates with a special format

安稳与你 提交于 2020-08-03 09:13:30
问题 I was wondering how I could create a sequence of dates in the following format: from "Jul 23 10:20" to "Jul 30 10:25" by "1" day? I tried the following without sucess: seq.Date(as.Date("Jul 23 10:20"), as.Date("Jul 30 10:25"), length.out = 7) 回答1: To preserve times you should convert to actual date-times, from which it is easy to build a sequence increasing by 1 day at a time. You can use strftime to format this as you please. strftime(seq(as.POSIXct("2020-07-23 10:20"), by = "1 day", length

R: count consecutive occurrences of values in a single column and by group

旧城冷巷雨未停 提交于 2020-07-30 02:17:32
问题 I am trying to create a sequential number of equal values, a count of occurrences. However, I want the count to reset once a new ID is introduced even if the the row remains sequential. Example of what my data looks like: dataset <- data.frame(ID = c("a","a","a","a","a","a","a","b","b","b","b","b","b","b") dataset$YesNO <- c(1,1,0,0,0,1,1,1,1,1,0,0,0,0) So I want to create a new column with the results in: c(1,2,1,2,3,1,2,1,2,3,1,2,3,4) I've used this code that I've found on this forum:

Disruptor之ExceptionHandler

醉酒当歌 提交于 2020-07-29 09:42:13
Disruptor的版本3.4.2. List-1 public interface ExceptionHandler<T> { /** * <p>Strategy for handling uncaught exceptions when processing an event.</p> * * <p>If the strategy wishes to terminate further processing by the {@link BatchEventProcessor} * then it should throw a {@link RuntimeException}.</p> * * @param ex the exception that propagated from the {@link EventHandler}. * @param sequence of the event which cause the exception. * @param event being processed when the exception occurred. This can be null. */ void handleEventException(Throwable ex, long sequence, T event); /** * Callback to

IdGenerator 唯一Id生成器

霸气de小男生 提交于 2020-07-29 07:39:44
public class IdGenerator { private final static long beginTs = 1483200000000L; private long lastTs = 0L; private long processId; private int processIdBits = 10; private long sequence = 0L; private int sequenceBits = 12; public IdGenerator () { } public IdGenerator ( long processId) { if (processId > (( 1 << processIdBits) - 1)) { throw new RuntimeException( "进程ID超出范围,设置位数" + processIdBits + ",最大" + (( 1 << processIdBits) - 1)); } this.processId = processId; } protected long timeGen () { return System.currentTimeMillis(); } public synchronized long nextId () { long ts = timeGen(); //

使用Ocelot、IdentityServer4、Spring Cloud Eureka搭建微服务网关:Step by Step(二)

空扰寡人 提交于 2020-07-29 07:18:29
本文继续介绍使用Ocelot、IdentityServer4以及Spring Cloud Eureka搭建微服务网关的步骤。相关文章: 《 使用Ocelot、IdentityServer4、Spring Cloud Eureka搭建微服务网关:Step by Step(一) 》 Step 4:引入Ocelot API网关 新建一个ASP.NET Core API项目,添加对以下NuGet包的引用: Ocelot IdentityServer4 IdentityServer4.AccessTokenValidation Serilog(我使用了Serilog来输出格式化的日志,如果不使用Serilog,则不需要引用) 首先,修改Startup.cs文件,用来启用Ocelot,并指定身份认证机构为之前我们建好的IdentityServer服务: public void ConfigureServices(IServiceCollection services) { services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2); services.AddAuthentication() .AddIdentityServerAuthentication("AuthProviderKey",

Python:numpy库中的一些函数简介、使用方法之详细攻略

僤鯓⒐⒋嵵緔 提交于 2020-07-29 06:53:36
Python:numpy库中的一些函数简介、使用方法之详细攻略 目录 numpy库中的一些函数简介、使用方法 1、np.concatenate() 1.1、函数案例 1.2、函数用法 numpy库中的一些函数简介、使用方法 1、np.concatenate() 1.1、函数案例 import numpy as np a=np.array([1,2,3]) b=np.array([11,22,33]) c=np.array([44,55,66]) d=np.concatenate((a,b,c),axis=0) # 默认情况下,axis=0可以不写 print(d) #输出array([ 1, 2, 3, 11, 22, 33, 44, 55, 66]),对于一维数组拼接,axis的值不影响最后的结果 1.2、函数用法 concatenate Found at: numpy.core.multiarray concatenate((a1, a2, ...), axis=0, out=None) Join a sequence of arrays along an existing axis. Parameters ---------- a1, a2, ... : sequence of array_like. The arrays must have the same shape,

Oracle 12C DataGuard部署以及维护

跟風遠走 提交于 2020-07-28 18:35:53
Oracle 12C DataGuard部署以及维护 iverycd 2019-02-10 17:24:04 2984 收藏 4 分类专栏: DataGuard 版权 Oracle 12C DataGuard部署 一、环境部署 二、维护使用 2.1 检查主备库的归档日志号 2.2 检查备库的归档日志同步情况以及应用指标参数 2.3 查看主备库的模式 2.4 主备库归档日志维护 2.5 备库磁盘空间不足处理 2.6 重建备库 三、取消DataGuard环境 3.1 Standby Database Alone 3.2 主库脱离DataGuard 12c的Dataguard部署过程还是与11g类似,可以按照11g的部署方法进行部署。 一、环境部署 Primary Standby DB Version 12.1.0.2 12.1.0.2 Hostname primary standby HOST IP 172.16.4.51 172.16.4.52 DB_NAME orcl orcl DB_UNIQUE_NAME orcl stdorcl Instance_Name orcl stdorcl DB Listener 1521 1521 DB Storage FileSystem FileSystem DB files /u01/app/oracle/oradata/orcl/ /u01

SPOJ MAXOR (分块 || 可持久化字典树 || 异或)(好题)

两盒软妹~` 提交于 2020-07-28 09:51:38
You are given a sequence A[1], A[2], ..., A[N]. (0 ≤ A[i] < 2 31 , 1 ≤ N ≤ 12000). A query is defined as follows: Query(x,y) = Max { a[i] xor a[i+1] xor ... xor a[j] ; l ≤ i ≤ j ≤ r }. l = min ( ((x+lastans) mod N)+1 , ((y+lastans) mod N)+1 ). r = max ( ((x+lastans) mod N)+1 , ((y+lastans) mod N)+1 ). lastans[1] = 0 , lastans[i] = Query[i-1]. Given M queries, your program must output the results of these queries. (0 ≤ M ≤ 6000). IMPORTANT : PROBLEM ENHANCED. ( I'M SO SORRY.. ) Input The first line of the input file contains 2 numbers : N M. In the second line, N numbers follow. M lines follow,

SequoiaDB监控与开发实践分析

强颜欢笑 提交于 2020-07-28 08:08:05
使用背景 公司近期上线了一个新应用,底层数据库采用了 国产的分布式数据库 – SequoiaDB 。 因为需要将 SequoiaDB 集群纳入到公司的整个监控体系中,所以需要对 SequoiaDB 的状态、性能指标等信息收集起来,然后提供监控系统使用。 SequoiaDB 数据库本身提供了一个图形化的监控界面 – SAC,但是里面的监控项,和我们公司过去常用的指标有很大出入。所以在咨询了 SequoiaDB 的相关人员后,决定自己开发一套监控程序。 SequoiaDB 存储引擎的监控 在 SequoiaDB 数据库,存在两个大的体系,一个是计算层,像我们就是使用了 MySQL 实例,另外一个就是 SequoiaDB 的分布式存储层,也是整个数据库对性能影响最大的部分。 关于 MySQL 的监控,公司本来就已经存在一整套完备的监控程序,所以这块就不需要再额外的开发了。但是对于 SequoiaDB 底层的分布式,还是非常有必要将相关指标收集起来的。 SequoiaDB 在监控体系上,其实做得还是比较完整的,只是在展现方式上,还需要再打磨一下。SequoiaDB 底层分布式的所有运行信息,用户都可以通过snapshot,或者是list 命令获取。 我从 SequoiaDB 的技术人员中了解到,其实像 SAC,或者 sdbtop 等这种 SequoiaDB 官方提供的监控工具