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<h2 id="useful-keybinding">Useful keybinding</h2>
<h3 id="buffer-and-window">Buffer and window</h3>
<ul>
<li>SPC f s Save a buffer</li>
<li>SPC f S Save all opened buffers</li>
<li>SPC f f Open the buffer in now directory</li>
<li>SPC f r Open the buffer and search in recently files</li>
<li>SPC b b Open or switch a buffer with helm</li>
<li>SPC b d Delete a buffer</li>
<li>SPC b K Delete other buffer but this</li>
<li>SPC w v/s split v or s</li>
<li>SPC h/l/j/k switch window</li>
</ul>
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<a class="post-link" href="/post/data_science/programming/python-pyenv-%E4%BD%BF%E7%94%A8%E6%96%B9%E6%B3%95%E6%80%BB%E7%BB%93/">Python-Pyenv 使用方法总结</a>
</h1>
<div class="post-meta">
<time datetime="2017-09-19" class="post-time">
2017-09-19
</time>
<div class="post-category">
<a href="https://lengyueyang.github.io/categories/%E7%BC%96%E7%A8%8B/"> 编程 </a>
<a href="https://lengyueyang.github.io/categories/%E5%8C%BB%E5%AD%A6%E6%95%B0%E6%8D%AE%E7%A7%91%E5%AD%A6/"> 医学数据科学 </a>
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<span class="more-meta"> 约 1130 字 </span>
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<h2 id="pyenv-简介">Pyenv 简介</h2>
<p>在使用 python 进行编程时, 经常遇到多个编程环境共存问题. pyenv 可以很好的解决这个问题, 本教程根据是学习使用 pyenv 的记录.</p>
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<a class="post-link" href="/post/data_science/math/%E9%AB%98%E7%AD%89%E4%BB%A3%E6%95%B0-%E7%BA%BF%E6%80%A7%E6%96%B9%E7%A8%8B%E7%BB%84%E7%9A%84%E8%A7%A3%E6%B3%95/">高等代数-线性方程组的解法</a>
</h1>
<div class="post-meta">
<time datetime="2017-08-07" class="post-time">
2017-08-07
</time>
<div class="post-category">
<a href="https://lengyueyang.github.io/categories/%E6%95%B0%E5%AD%A6%E5%9F%BA%E7%A1%80/"> 数学基础 </a>
<a href="https://lengyueyang.github.io/categories/%E5%8C%BB%E5%AD%A6%E6%95%B0%E6%8D%AE%E7%A7%91%E5%AD%A6/"> 医学数据科学 </a>
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<span class="more-meta"> 约 1693 字 </span>
<span class="more-meta"> 预计阅读 4 分钟 </span>
<span class="more-meta"> <a href="https://lengyueyang.github.io/post/data_science/math/%E9%AB%98%E7%AD%89%E4%BB%A3%E6%95%B0-%E7%BA%BF%E6%80%A7%E6%96%B9%E7%A8%8B%E7%BB%84%E7%9A%84%E8%A7%A3%E6%B3%95/#disqus_thread">评论</a> </span>
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解线性方差组的矩阵消元法 左端都是未知量 \(x_1, x_2, \dots , x_n\) 的一次其次式，右端是常数的方程组称为线性方程组，每个未知量前面的数称为系数，右端的项称为常数
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<a class="post-link" href="/post/life/%E6%88%BF%E5%AD%90%E5%8C%97%E4%BA%AC/">房子，北京</a>
</h1>
<div class="post-meta">
<time datetime="2017-03-15" class="post-time">
2017-03-15
</time>
<div class="post-category">
<a href="https://lengyueyang.github.io/categories/%E7%94%9F%E6%B4%BB/"> 生活 </a>
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<span class="more-meta"> 约 702 字 </span>
<span class="more-meta"> 预计阅读 2 分钟 </span>
<span class="more-meta"> <a href="https://lengyueyang.github.io/post/life/%E6%88%BF%E5%AD%90%E5%8C%97%E4%BA%AC/#disqus_thread">评论</a> </span>
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<h2 id="缘起">缘起</h2>
<p>今天早上看了一篇同学分享的文章–<a href="http://mp.weixin.qq.com/s?%5F%5Fbiz=MjM5OTQ0MjM4MA==&mid=2651896417&idx=2&sn=3f956b783256b99e925c1c062b50a773&chksm=bcdf78c28ba8f1d416901eae3e4cea7230f176c975007d4af61c153303ecc75a498ce7711a31&mpshare=1&scene=1&srcid=0313S3DzfdNKeRHFAUfjBRoZ#rd">《清华硕士集体逃离北京！一枚中科院科研人员的自白： 我为什么选择离开》</a></p>
<p>又一次被现实刺痛，思绪满天飞，于是写下这篇博客</p>
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<a class="post-link" href="/post/tools/spacemacs/%E7%94%A8mu4e%E7%AE%A1%E7%90%86%E9%82%AE%E4%BB%B6/">用mu4e管理邮件</a>
</h1>
<div class="post-meta">
<time datetime="2017-02-26" class="post-time">
2017-02-26
</time>
<div class="post-category">
<a href="https://lengyueyang.github.io/categories/spacemacs/"> Spacemacs </a>
<a href="https://lengyueyang.github.io/categories/%E5%B7%A5%E5%85%B7%E9%93%BE/"> 工具链 </a>
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<span class="more-meta"> 约 1452 字 </span>
<span class="more-meta"> 预计阅读 3 分钟 </span>
<span class="more-meta"> <a href="https://lengyueyang.github.io/post/tools/spacemacs/%E7%94%A8mu4e%E7%AE%A1%E7%90%86%E9%82%AE%E4%BB%B6/#disqus_thread">评论</a> </span>
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<h2 id="概述">概述</h2>
<p>用 offlineimap 收取邮件，用 mu4e 在 emacs 中管理邮件，本教程配置多账户。</p>
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<a class="post-link" href="/post/tools/org_mode/%E4%BD%BF%E7%94%A8org-mode%E5%81%9A%E6%97%B6%E9%97%B4%E7%AE%A1%E7%90%86/">使用Org-mode做时间管理</a>
</h1>
<div class="post-meta">
<time datetime="2016-02-28" class="post-time">
2016-02-28
</time>
<div class="post-category">
<a href="https://lengyueyang.github.io/categories/org-mode/"> Org-mode </a>
<a href="https://lengyueyang.github.io/categories/%E5%B7%A5%E5%85%B7%E9%93%BE/"> 工具链 </a>
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<span class="more-meta"> 约 933 字 </span>
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<span class="more-meta"> <a href="https://lengyueyang.github.io/post/tools/org_mode/%E4%BD%BF%E7%94%A8org-mode%E5%81%9A%E6%97%B6%E9%97%B4%E7%AE%A1%E7%90%86/#disqus_thread">评论</a> </span>
<span id="/post/tools/org_mode/%E4%BD%BF%E7%94%A8org-mode%E5%81%9A%E6%97%B6%E9%97%B4%E7%AE%A1%E7%90%86/" class="leancloud_visitors" data-flag-title="使用Org-mode做时间管理">
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<h2 id="写在前面">写在前面</h2>
<ul>
<li>最近准备学习 R 和 Python 语言，比较了很多编辑器，最终选择了 Emacs，看到知乎上很多大神推荐 Spacemacs，准备用 Spacemacs 编写程序, 同时建立博客，记录学习过程。</li>
<li>首先接触了 Org-mode，用 org-mode 做时间管理，本文简述我用 org-mode 做时间管理的流程以及配置。</li>
<li>在用 org-mode 之前，应该有一些 Spacemacs 及 Org-mode 的使用经验（参见<a href="https://github.com/syl20bnr/spacemacs/blob/master/layers/org/README.org#element-insertion">pacemacs Keybinding</a>和<a href="http://www.gnu.org/software/emacs/manual/html%5Fmono/org.html#Outlines">Org Mode Manual</a>)。</li>
</ul>
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<path d="M682.666667 512V170.666667h42.666666V85.333333H298.666667v85.333334h42.666666v341.333333l-85.333333 85.333333v85.333334h221.866667v256h68.266666v-256H768v-85.333334l-85.333333-85.333333z"></path>
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<a class="post-link" href="/post/tools/org_mode/%E5%8D%9A%E5%AE%A2%E8%BF%81%E7%A7%BB%E6%9D%82%E8%AE%B0-%E4%BB%8E-hexo-%E5%88%B0-nikola/">博客迁移杂记-从 Hexo 到 Nikola</a>
</h1>
<div class="post-meta">
<time datetime="2018-01-07" class="post-time">
2018-01-07
</time>
<div class="post-category">
<a href="https://lengyueyang.github.io/categories/org-mode/"> Org-mode </a>
<a href="https://lengyueyang.github.io/categories/%E5%B7%A5%E5%85%B7%E9%93%BE/"> 工具链 </a>
</div>
<span class="more-meta"> 约 3699 字 </span>
<span class="more-meta"> 预计阅读 8 分钟 </span>
<span class="more-meta"> <a href="https://lengyueyang.github.io/post/tools/org_mode/%E5%8D%9A%E5%AE%A2%E8%BF%81%E7%A7%BB%E6%9D%82%E8%AE%B0-%E4%BB%8E-hexo-%E5%88%B0-nikola/#disqus_thread">评论</a> </span>
<span id="/post/tools/org_mode/%E5%8D%9A%E5%AE%A2%E8%BF%81%E7%A7%BB%E6%9D%82%E8%AE%B0-%E4%BB%8E-hexo-%E5%88%B0-nikola/" class="leancloud_visitors" data-flag-title="博客迁移杂记-从 Hexo 到 Nikola">
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<h2 id="迁移原因">迁移原因</h2>
<p>16 年年初，开始搭建自己的个人博客，一不小心入了 <code>spacemacs</code> 的坑，一直用 <code>Org-mode</code> 写作、记笔记等，因此博客必须支持 <code>Org-mode</code> ，最开始的解决方案是 Hexo，用 <code>hexo-renderer-org</code> 将 Org-mde 格式转化，使用 Next 主题，确实比较好看，当时配置博客站点花了很长时间，在使用过程中，总是会有 hexo 插件更新问题，导致博客不能发布等，因此，最近一个月寻找 hexo 的替代者。</p>
<p>Nikola 是用 Python 写的，恰好以后要学 Python，同时 Nikola 通过 Org-mode 插件支持 Org-mode，于是选择 Nikola 作为博客框架，目前一切还好，就是主题比较难看。博客迁移过程用，参考<sup class="footnote-ref" id="fnref:fn-1"><a href="#fn:fn-1">1</a></sup><sup>, </sup><sup class="footnote-ref" id="fnref:fn-2"><a href="#fn:fn-2">2</a></sup><sup>, </sup><sup class="footnote-ref" id="fnref:fn-3"><a href="#fn:fn-3">3</a></sup><sup>, </sup><sup class="footnote-ref" id="fnref:fn-4"><a href="#fn:fn-4">4</a></sup></p>
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<a class="post-link" href="/post/data_science/math/%E9%AB%98%E7%AD%89%E4%BB%A3%E6%95%B0-%E8%A1%8C%E5%88%97%E5%BC%8F/">高等代数-行列式</a>
</h1>
<div class="post-meta">
<time datetime="2017-09-05" class="post-time">
2017-09-05
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<div class="post-category">
<a href="https://lengyueyang.github.io/categories/%E6%95%B0%E5%AD%A6%E5%9F%BA%E7%A1%80/"> 数学基础 </a>
<a href="https://lengyueyang.github.io/categories/%E5%8C%BB%E5%AD%A6%E6%95%B0%E6%8D%AE%E7%A7%91%E5%AD%A6/"> 医学数据科学 </a>
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<span class="more-meta"> 约 2783 字 </span>
<span class="more-meta"> 预计阅读 6 分钟 </span>
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<span id="/post/data_science/math/%E9%AB%98%E7%AD%89%E4%BB%A3%E6%95%B0-%E8%A1%8C%E5%88%97%E5%BC%8F/" class="leancloud_visitors" data-flag-title="高等代数-行列式">
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n 元排列 n 个不同正整数的一个全排列称为 n 元排列. 在 n 元排列 \(a_1, a_2, ⋯, a_n\) 中, 任取一对数 \(a_i,a_j(i < j)\), 如果 \(a_i < a_j\), 那么这一对数构成一个 顺序, 否则, 这对数构成
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