思维之海

——在云端,寻找我的星匙。

看了《流浪地球》,真香。​前半段想退票。。后半段超神辣。


我常常问自己我是谁。

此刻我正坐在一个油烟味挥之不去的位置上,我让冷掉的泡面静静地占据嗅觉空间,我像是在觅食的贪狼。现在我要捕食我自己。荧屏又在闪动,好像显卡连刷新的力气都没有了。但显然,面前的这台机器比我更了解我。输入“我-是-谁”,噼里啪啦一顿敲。蓝色的圆弧开始循环动画,这是在向深度查找答案呢。

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贝里接到任务的时候,他的研究小组已经迫不及待。

在研发出第3代磁流体推进器以后,他们果断地抛弃了磁流体这个已经榨不出更多营养的果子。没有谁比他们更清楚,这看似应用前途宽广的电磁学体系,现在已经受到巨大的限制了——一方面,希维政府缩减了放在运输工具的支出,先进武器的研制被放到了首位;另一方面,贝里知道,现在的小型核电效率还不够高,如果希维政府一意孤行,不在基础科学上加大力度,即使研制出更先进的推进器也会因为动力不足而成为废铁一堆。他想着,开始兴奋起来,现在将要被接手的项目,是赶在突袭阿舍密的行动前,发展出新一代的马赫鱼雷。

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“Intro to Computer Systems” is a CS course held by CMU with course number CS213. Its home page says:

The ICS course provides a programmer’s view of how computer systems execute programs, store information, and communicate. It enables students to become more effective programmers, especially in dealing with issues of performance, portability and robustness. It also serves as a foundation for courses on compilers, networks, operating systems, and computer architecture, where a deeper understanding of systems-level issues is required. Topics covered include: machine-level code and its generation by optimizing compilers, performance evaluation and optimization, computer arithmetic, memory organization and management, networking technology and protocols, and supporting concurrent computation.

I note down some of the good stuff in case I forgot sometime. But mostly just a review before final test, don’t expect too much LOL.

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Introduction

Python中的Pyspider是用于开发网络爬虫——网上大数据收集工具的一个框架。

收集数据为了下一步大数据处理(机器学习)做准备。

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浮动静止的水面上,一只体态丰满强壮的海豹正趴在浮冰的边缘,它静伫不动,伺机等待猎物自投罗网。

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Introduction

偶然想到了行列式。
众所周知,行列式都是方阵,$n \times n$。

那么,存不存在$m \times n$的行列式呢?甚至,如何求解呢?

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