5 Comments
访客 *colinisstudent* @ 2007-11-10 18:52:01 写道：
我就是对那一块一无所知
yihui 2022-12-16 07:19:32有些东西提一提也不会太花时间，比如时域分析是直接研究Xt和相应滞后项的关系，而频域是把Xt展开为一系列周期函数（三角函数）之和
——原帖发布于 2007-11-11 07:36:45
访客 *XMG* @ 2007-11-10 21:47:20 写道：
非常赞同
适当扩展一下知识面真是太重要了。
yihui 2022-12-16 07:19:34其实De Moivre定理（高中的知识也忘了）、Fourier展开、欧拉公式等在频域分析中都非常有用
——原帖发布于 2007-11-11 13:19:33
访客 *Anita_jiu* @ 2007-11-10 23:35:13 写道：
I have a similar impression. In general, many people (including students) do not have a critical thinking perspective on theories; they learn from teaching not from self-learning! This is a serious and common (unfortunately) issue in the academia. Were we encouraged to question theories when we were taught? Em..., not really, weren't we? However, as you possible would agree with me that theories do not always work. Students show little motivation to learn (or shall I say 'to be taught'?). The thought of '学到哪儿算哪儿' is restricting us from 'effective' teaching...
'上课跟着老师走是远远不够的。要开阔眼界' - sigh, lack of motivation...
'否则几年下来，一代不如一代' - Unless students/audience see the serious outcomes and react accordingly, otherwise, it is likely that this would be happening.
yihui 2022-12-16 07:19:33In a word, we should learn to learn...
Originally posted on 2007-11-11 07:37:37
访客 *五脚星* @ 2007-11-11 10:17:57 写道：
同意，看来有必要对Wei的时序再精读。不过当初那本书就是自学的嘛...
yihui 2022-12-16 07:19:35当年的学习不全都为了考试么，哪会有人去看考试之外的内容啊……
——原帖发布于 2007-11-12 06:14:16
访客 *redlou* @ 2007-11-12 16:37:26 写道：
觉得基本功和知识面都很重要，现在国内的高等教育在这
两个方面都有欠缺。像wavelet，很多人把它用到统计上了，可怜我一点也不懂。
yihui 2022-12-16 07:19:36对学生要求相对来说还是太松了，而且国内整体统计水平就不太高。小波我基本上也是一点都不懂，但它和统计的结合在一些论文中也显示了无比的威力。
——原帖发布于 2007-11-12 18:39:08
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