Today is a good day to start parallelizing your code. I’ve been using the parallel package since its integration with R (v. 2.14.0) and its much easier than it at first seems. In this post I’ll go through the basics for implementing parallel computat…

要学的东西太多,无笔记不能学~~ 欢迎关注公众号,一起分享学习笔记,记录每一颗"贝壳"~ --------------------------- 终于开始攻克并行这一块了,有点小兴奋,来看看网络上R语言并行办法有哪些: 赵鹏老师(R与并行计算)做的总结已经很到位.现在并行可以分为:  隐式并行:隐式计算对用户隐藏了大部分细节,用户不需要知道具体数据分配方式 ,算法的实现或者底层的硬件资源分配.系统会根据当前的硬件资源来自动启动计算核心.显然,这种模式对于大多数用户来说是最喜闻乐见的.…

GNU Parallel Tutorial Prerequisites Input sources A single input source Multiple input sources Linking arguments from input sources Changing the argument separator. Changing the argument delimiter End-of-file value for input source Skipping empty lin…

http://www.onjava.com/pub/a/onjava/2001/05/30/optimization.htmlComparing the performance of LinkedLists and ArrayLists (and Vectors) (Page last updated May 2001, Added 2001-06-18, Author Jack Shirazi, Publisher OnJava). Tips: ArrayList is faster than…

距离上次更新博客,时隔略长,诸事繁琐,赶在去广州答辩之前,分享下安卓 android 中的一个 列表收缩 类---ExpandableListView 先上效果图: 如果想直接看实现此页面的代码请下滑到 红线 下 关于这个类的具体各函数的使用说明,这里不作详细说明,提供一个链接http://www.apkbus.com/android-124715-1-1.html,里面有关于此类的详细介绍. 我在这里主要通过源代码的注释和必要的说明,说明如何实现自定义的收缩列表. 必要的函数: 0-> Exp…

# This file contains command-line options that the C# # command line compiler (CSC) will process as part # of every compilation, unless the "/noconfig" option # is specified. #========================================== # Reference the common Fra…

<Differential Geometry of Curves and Surfaces> by Manfredo P. do Carmo real line Rinterval I==============================================CH1 CurvesDEFINITION. A parametrized differentiable curve is a differentiable map a: I --> R3 of [an open in…

实验题目: 将小学四则运算整合成网页版或者是Android版.实现有无余数,减法有无负数.... 设计思路: 由于学到的基础知识不足,只能设计简单的加减乘除,界面设计简单,代码量少,只是达到了入门级的水平. 实验代码: <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" an…

短时间锁定的情况下,自旋锁(spinlock)更快.(因为自旋锁本质上不会让线程休眠,而是一直循环尝试对资源访问,直到可用.所以自旋锁线程被阻塞时,不进行线程上下文切换,而是空转等待.对于多核CPU而言,减少了切换线程上下文的开销,从而提高了性能.) 以下是简单实例(并行执行10000次,每次想list中添加一项.执行完后准确的结果应该是10000): foo1:使用系统的自旋锁. foo4:不使用锁.结果必然是不正确的. foo5:通过Interlocked实现自旋锁. public clas…

/* * Copyright (C) 2014 Jason Fang ( ijasonfang@gmail.com ) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http…