<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[Colin_Downey的博客]]></title><description><![CDATA[Stay hungry, stay foolish. Email: Colin_DowneyAT126.com]]></description><link>https://blog.youkuaiyun.com/Colin_Downey</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; Colin_Downey]]></copyright><item><title><![CDATA[conda创建环境报错 ‘setuptools‘ is a dependency of conda]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/113799294</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/113799294</guid><author>Colin_Downey</author><pubDate>Sat, 13 Feb 2021 09:53:05 +0800</pubDate><description><![CDATA[RemoveError: 'setuptools' is a dependency of conda and cannot be removed from
conda's operating environment.

This error is about you can not update setuptools in conda env, so you should update conda dependency as fllow 'conda update --update-deps conda'.]]></description><category></category></item><item><title><![CDATA[猫猫吃小鱼干问题——策略与证明（其实是猜帽子问题啦！）]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/107535136</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/107535136</guid><author>Colin_Downey</author><pubDate>Thu, 23 Jul 2020 14:00:54 +0800</pubDate><description><![CDATA[本文主要内容来自：Ebert, Todd &amp; Merkle, Wolfgang &amp; Vollmer, Heribert. (2002). On the Autoreducibility of Random Sequences. SIAM J. Computing. 32. 10.1137/S0097539702415317. 

考虑这样的一个问题：
一个铲屎官有三只猫猫????。有一天，铲屎官买了两种颜色的项圈（橙色和蓝色），给主子们带上。然而，主子们并不知道自己被戴上的是什么颜色的项圈，]]></description><category></category></item><item><title><![CDATA[[python实现]A*搜索算法解决八数码问题（图搜索算法,宽度优先搜索,深度优先搜索,代码附注释,GUI界面实现）]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/106082980</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/106082980</guid><author>Colin_Downey</author><pubDate>Tue, 12 May 2020 19:14:08 +0800</pubDate><description><![CDATA[项目地址： https://github.com/ColinDowney/Graph-Search-for-8-Puzzle
参考： 清华大学出版社. 人工智能. 马少平, 朱小燕.
内容： 使用python实现了三种不同启发函数的A*搜索算法（图搜索），以及宽度优先搜索和深度优先搜索，并计算扩展结点数和生成结点数，可以输出解路径。有GUI交互界面。

License: MIT

...]]></description><category></category></item><item><title><![CDATA[CORS Error: Cross origin requests are only supported for HTTP; XMLHttpRequest; 加载本地文件html]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/105983602</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/105983602</guid><author>Colin_Downey</author><pubDate>Thu, 07 May 2020 22:55:54 +0800</pubDate><description><![CDATA[在打开本地文件时出现CORS Error: Cross origin requests are only supported for HTTP，无法加载本地文件。







出错原因：



解决方法：


1.Install NodeJS// Hint: If you're on a Mac, you want to install and useHomebrewfor this

...]]></description><category></category></item><item><title><![CDATA[余弦相似度和相关系数以及z-score之间的关系]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/105531840</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/105531840</guid><author>Colin_Downey</author><pubDate>Wed, 15 Apr 2020 12:01:39 +0800</pubDate><description><![CDATA[余弦相似度和相关系数以及z-score之间的关系
向量aaa和bbb之间的余弦相似度只与他们之间的角度有关：
cosθ=a⋅b∥a∥∥b∥
cos\theta = \frac{a\cdot b}{\|a\| \|b\|}
cosθ=∥a∥∥b∥a⋅b​
应用余弦相似度的时候，很多情况下向量都是非负的（比如文档中词项的频次向量）。在这些时候，余弦相似度也是非负的。

...]]></description><category></category></item><item><title><![CDATA[理解自信息和信息熵——为什么自信息这样算？]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/105217487</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/105217487</guid><author>Colin_Downey</author><pubDate>Tue, 31 Mar 2020 11:04:11 +0800</pubDate><description><![CDATA[一直对香农的信息熵(Information Entropy)都没有一个非常感性的认识，今日摸鱼学习了一下这个问题。  

我们先来看看香农是怎么看待交流中的“信息”：


“The fundamental problem of communication is that of reproducing at one point either exactly or approximately a ...]]></description><category></category></item><item><title><![CDATA[[android sqlite]cursor读取数据表行列里面的所有数据;cursor仅读取了第一行;cursor移动问题;moveToNext返回false]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/103608478</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/103608478</guid><author>Colin_Downey</author><pubDate>Thu, 19 Dec 2019 09:19:54 +0800</pubDate><description><![CDATA[程序从sqlite数据库读取数据并放入ListView组件中，然而实际运行的时候总是只能读出第一行的数据。代码如下：


cursor.moveToFirst();

int colNum = cursor.getColumnCount();
do{
    for(int i=0;i&lt;=colNum;++i){
        list.add(cursor.getString(i));
...]]></description><category></category></item><item><title><![CDATA[[android开发]来电拦截 ITelephony]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/103148062</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/103148062</guid><author>Colin_Downey</author><pubDate>Tue, 19 Nov 2019 18:05:59 +0800</pubDate><description><![CDATA[别试了用不了了（。

本来以为终于在这里找到了解决方案，然而


telephony.endCall()

需要系统权限


MODIFY_PHONE_STATE permission required.

同时，这个系统权限除了系统软件，其他任何的应用软件都无法获取。see:How to grant MODIFY_PHONE_STATE permission for apps ran on G...]]></description><category></category></item><item><title><![CDATA[人脑和人工智能中的视觉处理]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/103049449</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/103049449</guid><author>Colin_Downey</author><pubDate>Wed, 13 Nov 2019 15:29:50 +0800</pubDate><description><![CDATA[]]></description><category></category></item><item><title><![CDATA[[Android]用的TableLayout，怎么调都有列上面的Button都跑出去。]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/102242278</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/102242278</guid><author>Colin_Downey</author><pubDate>Sun, 06 Oct 2019 18:15:42 +0800</pubDate><description><![CDATA[计算器布局，用的TableLayout，怎么调都有列上面的Button都跑出去。

终于在TableLayout里的元素为什么宽度没有占满父控件里面找到了解决方法：


                &lt;Button android:text="xx"
                    android:id="@+id/btn_xx"
                    andro...]]></description><category></category></item><item><title><![CDATA[[Python] exception: no description]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/100074818</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/100074818</guid><author>Colin_Downey</author><pubDate>Mon, 26 Aug 2019 11:59:47 +0800</pubDate><description><![CDATA[文件加载失败
]]></description><category></category></item><item><title><![CDATA[[Linux][c语言]使用管道进行进程间通信 (父子进程通信、双向通信)]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/90179609</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/90179609</guid><author>Colin_Downey</author><pubDate>Thu, 11 Jul 2019 09:47:27 +0800</pubDate><description><![CDATA[本文翻译转载自：www.tutorialspoint.com, Inter Process Communication - Pipes

原创翻译，仅作为学习分享，侵删。

管道是两个或多个相关的进程之间的通信中介。这个通信中介可以是用来在同一个进程中通信，也可以是用来在父子进程之间通信。通信也可以是多层次的，比如在父进程、子进程、子孙进程之间的通信等。通信的实现是通过一个进程写入管道，另外一个进...]]></description><category></category></item><item><title><![CDATA[[Latex]visio画图导入矢量图到Latex | 裁剪pdf | 去掉pdf白边]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/95315127</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/95315127</guid><author>Colin_Downey</author><pubDate>Wed, 10 Jul 2019 11:32:49 +0800</pubDate><description><![CDATA[Visio中选择打印，打印到pdf  
	用WPS打开pdf，选择编辑
	直接编辑，留下想要的图像并保存。
	在latex中要插图的地方插入此pdf文件即可。



]]></description><category></category></item><item><title><![CDATA[[Latex]手动作者页排版（不使用模板）|图片环绕|作者简介|插入图片|图片说明|Picinpar  宏包 取消图片编号]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/95312802</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/95312802</guid><author>Colin_Downey</author><pubDate>Wed, 10 Jul 2019 10:36:45 +0800</pubDate><description><![CDATA[实现效果：



实现代码：




\documentclass{article}

%需要包含的包
\usepackage{picinpar}
\usepackage{graphicx}

%加上这个，以取消图片序号显示
\makeatletter
\long\def\figwindownonum[#1,#2,#3,#4] {% \begin{figwindownonum}
  \begi...]]></description><category></category></item><item><title><![CDATA[[Python]报错Could not install packages due to an EnvironmentError: [Errno 2] No such file or directory]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/90547975</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/90547975</guid><author>Colin_Downey</author><pubDate>Wed, 10 Jul 2019 09:51:31 +0800</pubDate><description><![CDATA[ERROR: Could not install packages due to an EnvironmentError: [Errno 2] No such file or directory:


https://stackoverflow.com/questions/38896424/tensorflow-not-found-using-pip


 WARNING: Retrying...]]></description><category></category></item><item><title><![CDATA[[C++]0x0F1DDCB1 (msvcp140d.dll)处(位于 Leaf.exe 中)引发的异常: 0xC0000005: 读取位置 0x00000000 时发生访问冲突。]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/91465029</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/91465029</guid><author>Colin_Downey</author><pubDate>Tue, 11 Jun 2019 20:40:24 +0800</pubDate><description><![CDATA[请检查数组和指针访问是否越界。
]]></description><category></category></item><item><title><![CDATA[[python pandas]dataframe添加行/按照原dataframe列名创建新的dataframe/保留原dataframe结构（append无法添加,添加之后仍然为空）]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/91371543</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/91371543</guid><author>Colin_Downey</author><pubDate>Mon, 10 Jun 2019 13:29:50 +0800</pubDate><description><![CDATA[网上有许多方法提到要用append或者loc直接赋值，但是我运行发现都不行，不知道为啥。我是想把原dataframe中的几行提出来放到新的dataframe中。

方法如下：


#按照原dataframe的列标题创建新的dataframe
NewDataFrame = pd.DataFrame(columns = OriginalDataFrame.columns.values)

#i为要提取...]]></description><category></category></item><item><title><![CDATA[[Latex] 在公式环境下报错：Misplaced alignment tab character &.]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/91128198</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/91128198</guid><author>Colin_Downey</author><pubDate>Fri, 07 Jun 2019 15:45:07 +0800</pubDate><description><![CDATA[在编辑公式时企图用&amp;进行对齐：


\begin{equation*}
\hat{x}^{(1)}(k+1)
&amp;=(x^{(0)}(1)-\frac{\hat{b}}{\hat{a}})e^{-\hat{a}k}+\frac{\hat{b}}{\hat{a}}\\
&amp;=184242e^{0.0116}-182016
\end{equation*}

其实之前一直这样用"...]]></description><category></category></item><item><title><![CDATA[你不知道的事——关于多级反馈队列MLFQ的一些细节]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/89418205</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/89418205</guid><author>Colin_Downey</author><pubDate>Mon, 22 Apr 2019 12:53:32 +0800</pubDate><description><![CDATA[多级反馈队列的基本原理此处不再阐述了。这里主要指出几个我关注到的细节而网上大部分的博客都没有提到的，并不全面。更多多级反馈队列的细节请参阅参考资料等。



进程可以大致分为CPU密集型的进程（CPU-bound jobs）和IO密集型的进程（I/O-bound jobs），而一般而言，对于IO密集型型进程，我们希望它更快得到处理。因为这类进程需要和用户进行交互，占用CPU时间少，优先处理它们能...]]></description><category></category></item><item><title><![CDATA[[Linux] end Kernel panic - not syncing: System is deadlocked on memory]]></title><link>https://blog.youkuaiyun.com/Colin_Downey/article/details/89358784</link><guid>https://blog.youkuaiyun.com/Colin_Downey/article/details/89358784</guid><author>Colin_Downey</author><pubDate>Wed, 17 Apr 2019 16:25:52 +0800</pubDate><description><![CDATA[虚拟机内存不够。
]]></description><category></category></item></channel></rss>