自认为学过线性代数，如今看来门都没进。
在下载了R 语言的安装包后，打开README才知道，线性代数的英语是: linear-algebra。
还是沉下心来打基础打好！
很欣赏R 语言的安装包里README最后一段：
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4. GOALS Our aim at the start of this project was to demonstrate that it was possible to produce an S-like environment which did not suffer from the memory-demands and performance problems which S has. Somewhat later, we started to turn R into a "real" system, but unfortunately we lost a large part of the efficiency advantage in the process, so have revised the memory management mechanism and implemented delayed loading of R objects. A lot of performance tuning has been done, including the ability to use tuned linear-algebra libraries. Longer-term goals include to explore new ideas: e.g. virtual objects and component-based programming, and expanding the scope of existing ones like formula-based interfaces. Further, we wish to get a handle on a general approach to graphical user interfaces (preferably with cross-platform portability), and to develop better 3-D and dynamic graphics. Sincerely, The R Core Team. |
再补充一algebraic:
(of a mathematical expression or equation) in which a finite number of symbols is combined using only the operations of addition, subtraction, multiplication, division, and exponentiation with constant rational exponents.
知乎上一个问题：
理解矩阵（一）:
http://blog.csdn.net/myan/article/details/647511
理解矩阵（二）:
http://blog.csdn.net/myan/article/details/649018
理解矩阵（三）:
http://blog.csdn.net/myan/article/details/1865397
David C. Lay教授的线性代数教程：