<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[doublehhcc的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/doublehhcc</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; doublehhcc]]></copyright><item><title><![CDATA[[MATLAB] 制作视频]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/104704794</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/104704794</guid><author>doublehhcc</author><pubDate>Fri, 06 Mar 2020 21:28:48 +0800</pubDate><description><![CDATA[writerObj=VideoWriter('test.avi'); %// 定义一个视频文件用来存动画
writerObj.FrameRate = 30; % 帧率
open(writerObj);  %// 打开该视频文件
figure()
for k=1:10
	plot(...);
	CF = getframe(gcf);
    writeVideo(writerObj,CF); %//...]]></description><category></category></item><item><title><![CDATA[Plotting Logarithmic Error Bars（如何在log log plot中绘制误差条）]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/104406029</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/104406029</guid><author>doublehhcc</author><pubDate>Thu, 20 Feb 2020 10:29:33 +0800</pubDate><description><![CDATA[Suppose that one has a sufficient number of measurements to make an estimate of a measured quantity yyy and report its absolute error, ±δy\pm\delta y±δy. The absolute error ±δy\pm\delta y±δy is repres...]]></description><category></category></item><item><title><![CDATA[[Matlab] Figure 窗口最大化]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/104338985</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/104338985</guid><author>doublehhcc</author><pubDate>Sun, 16 Feb 2020 10:27:19 +0800</pubDate><description><![CDATA[调用 Matlab 隐藏的 Java 底层接口：
h = figure();				% 创建图形窗口
warning('off','MATLAB:HandleGraphics:ObsoletedProperty:JavaFrame');	% 关闭相关的警告提示（因为调用了非公开接口）
jFrame = get(h,'JavaFrame');	% 获取底层 Java 结构相关句柄吧
pause(0....]]></description><category></category></item><item><title><![CDATA[用ssh给Linux服务器远程安装MATLAB 2019]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/102757912</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/102757912</guid><author>doublehhcc</author><pubDate>Sat, 26 Oct 2019 16:29:35 +0800</pubDate><description><![CDATA[1. 下载镜像文件R2019b_Linux.iso，并远程传输到服务器端。
2. 进入R2019b_Linux.iso所在文件夹，挂载镜像:

创建挂载点：mkdir -p home/MATLAB/mnt/
挂载镜像：mount -o loop R2019b_Linux.iso home/MATLAB/mnt/

3. 修改配置文件

复制installer_input.txt文件到其他地方（因为...]]></description><category></category></item><item><title><![CDATA[MATLAB输出报错信息到文件]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/90401077</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/90401077</guid><author>doublehhcc</author><pubDate>Tue, 21 May 2019 10:00:24 +0800</pubDate><description><![CDATA[MATLAB老版本用LASTERROR函数，返回最后一条错误信息(不推荐，新版本不再使用此函数)；
MATLAB新版本用MException class获取报错信息。
对于MException class，可以使用try-catch-end代码模块输出报错信息并保存到txt文件：
try
	main函数
catch ME
   % open file
   fiderror = fopen('lo...]]></description><category></category></item><item><title><![CDATA[Ubuntu16.04上使用Julia：Atom+Juno安装、错误排除]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/88233133</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/88233133</guid><author>doublehhcc</author><pubDate>Wed, 06 Mar 2019 14:37:22 +0800</pubDate><description><![CDATA[文章目录Juno简介(Julia的IDE编辑器)Atom+Juno安装流程出错提示其他编辑器（根据网上资料整理）：Sublime TextIjuliajuliaboxvimIntelliJ
Juno简介(Julia的IDE编辑器)
Juno是Julia的官方IDE，基于最近很火Atom开发，Juno是建立在Atom的基础上专门为编译julia设计的，横向支持linux/unix，mac和windo...]]></description><category></category></item><item><title><![CDATA[量子力学中exp(A+B)=exp(A)exp(B)exp(-[A,B]/2)是恒等式吗？]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/85346100</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/85346100</guid><author>doublehhcc</author><pubDate>Mon, 31 Dec 2018 21:13:01 +0800</pubDate><description><![CDATA[量子力学算符有这么一个表达式eA+B=eAeBe−12[A,B]e^{A+B}=e^Ae^Be^{-\frac{1}{2}[A,B]}eA+B=eAeBe−21​[A,B]，实际上这只是一个近似表达式，并不是恒等式！
Baker–Campbell–Hausdorff (BCH) formula：
Z=log⁡(eXeY)=X+Y+∑m=2∞Zm(X,Y).Z = \log(e^Xe^Y) = X ...]]></description><category></category></item><item><title><![CDATA[系综理论（Ensemble Theory）]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/85304357</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/85304357</guid><author>doublehhcc</author><pubDate>Mon, 31 Dec 2018 13:15:21 +0800</pubDate><description><![CDATA[本文参考[Pathria] Statistical Mechanics (3rd Ed.)里的思路整理了系综理论的一些基本知识。Pathria的书有较多繁复的计算，在此不详细给出，只希望对系综理论能形成一个宏观的认知。
1. 前言
给定一个系统的宏观态描述(N,V,E)(N,V ,E)(N,V,E)，即系统具有固定的粒子数、体积、总能量，它在不同时刻都会处于某一个微观态，而这些可能的微观态数目很多...]]></description><category></category></item><item><title><![CDATA[Pure and Mixed States 纯态与混合态]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/84862798</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/84862798</guid><author>doublehhcc</author><pubDate>Fri, 14 Dec 2018 19:59:26 +0800</pubDate><description><![CDATA[1. Pure States
A pure state is any state that can be represented by a single state vector ∣ψ⟩|\psi \rangle∣ψ⟩.  What this means in practice is that at any time we can say for certain (with 100% probab...]]></description><category></category></item><item><title><![CDATA[The Hydrogen-like Atom 类氢原子波函数直观图像]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/84568248</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/84568248</guid><author>doublehhcc</author><pubDate>Tue, 27 Nov 2018 20:53:32 +0800</pubDate><description><![CDATA[The Hydrogen AtomWave function of hydrogen-like atom如何插入一段漂亮的代码片如何创建一个注脚注释也是必不可少的新的甘特图功能，丰富你的文章导出与导入导出导入
Wave function of hydrogen-like atom
The wave function of the hydrogen atom is ψnlm(r,θ,ϕ)=Rnl(r...]]></description><category></category></item><item><title><![CDATA[Differential Geometry——Surfaces]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/82628211</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/82628211</guid><author>doublehhcc</author><pubDate>Tue, 11 Sep 2018 22:52:33 +0800</pubDate><description><![CDATA[A surface S is ruled (also called a scroll) if through every point of S there is a straight line that lies on S. (Ref: wiki)

Informally speaking, a ruled surface is one that is a union of straight li...]]></description><category></category></item><item><title><![CDATA[解决gnu octave (ubuntu下MATLAB替代软件)输出图片无法打印Latex格式的问题]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/81393431</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/81393431</guid><author>doublehhcc</author><pubDate>Fri, 03 Aug 2018 20:44:19 +0800</pubDate><description><![CDATA[问题描述：

版本信息： 
OS：ubuntu16.04 
Octave Version：4.0.0

在画图标注中（如标题，x-y轴）使用Latex格式的符号时，用octave自带的plot画图显示正常，但是当用saveas或print保存图像时，发现保存的图像无法正常显示Latex格式。举例来说，如果标题里有Latex格式的内容：

title(''E_{chiral} / N'')

则pl...]]></description><category></category></item><item><title><![CDATA[如何用均匀分布随机数生成正态分布随机数]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/81166502</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/81166502</guid><author>doublehhcc</author><pubDate>Mon, 23 Jul 2018 21:03:54 +0800</pubDate><description><![CDATA[如何用均匀分布随机数生成正态分布随机变量



前言

在Monte Carlo模拟技术中，许多地方都需要用到符合标准正态分布(高斯)的随机数来设计采样方案，因此了解如何用均匀分布随机数(实际上是均匀分布的伪随机数)来生成标准正态分布的随机数十分重要。本文将对这个最基本的问题做讨论，并提供c++11代码。

我们介绍两种算法: 
The Box–Muller transform 和 The Zig...]]></description><category></category></item><item><title><![CDATA[随机系统(stochastic systems)——以随机游走为例]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/79384678</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/79384678</guid><author>doublehhcc</author><pubDate>Thu, 01 Mar 2018 22:14:25 +0800</pubDate><description><![CDATA[目录



 





 


一杯咖啡是随机的吗？
随机游走与扩散
扩散定律是普适的
由扩散支配的亚细胞世界
摩擦与扩散是一对双胞胎——爱因斯坦关系
爱因斯坦关系溯源——涨落耗散定理








一杯咖啡是随机的吗？

生活中有许多例子是牛顿力学基本能完全描述的：苹果落地，炮弹轨迹等。这些简单的过程可以由微分方程和初始条件唯一确定。比如知道了炮弹的初始速度和角度，那么后续的轨迹就能用牛顿第...]]></description><category></category></item><item><title><![CDATA[[计算最大公因子]Finding the greatest common divisor (gcd) of 2 numbers]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/78798231</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/78798231</guid><author>doublehhcc</author><pubDate>Thu, 14 Dec 2017 00:00:36 +0800</pubDate><description><![CDATA[Euclidean algorithm (Find gcd of two numbers)]]></description><category></category></item><item><title><![CDATA[Python迭代器，可迭代对象，生成器]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/78756400</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/78756400</guid><author>doublehhcc</author><pubDate>Wed, 13 Dec 2017 23:51:30 +0800</pubDate><description><![CDATA[【Python迭代器】]]></description><category></category></item><item><title><![CDATA[Anaconda(Python科学计算环境)教程]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/78750372</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/78750372</guid><author>doublehhcc</author><pubDate>Fri, 08 Dec 2017 12:40:35 +0800</pubDate><description><![CDATA[anaconda使用教程]]></description><category></category></item><item><title><![CDATA[机器学习实践指南]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/78749596</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/78749596</guid><author>doublehhcc</author><pubDate>Fri, 08 Dec 2017 11:13:55 +0800</pubDate><description><![CDATA[http://blog.jobbole.com/112569/?utm_source=blog.jobbole.com&utm_medium=relatedPosts]]></description><category></category></item><item><title><![CDATA[【数据结构】递归,栈]]></title><link>https://blog.youkuaiyun.com/doublehhcc/article/details/78685509</link><guid>https://blog.youkuaiyun.com/doublehhcc/article/details/78685509</guid><author>doublehhcc</author><pubDate>Fri, 01 Dec 2017 12:59:37 +0800</pubDate><description><![CDATA[递归和栈]]></description><category></category></item></channel></rss>