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【求助】单位矩阵为什么又叫E?
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2楼2010-12-31 16:21:50
wangyujia(金币+10):呵呵!谢谢啊!我怎么忘了在维基上搜一下呢?谢谢! 2011-01-01 19:43:15
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Some mathematics books use U and E to represent the Identity Matrix (meaning " Unit Matrix" and "Elementary Matrix", or from the German "Einheitsmatrix", respectively), although I is considered more universal. http://en.wikipedia.org/wiki/Identity_matrix |
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小木虫: 金币+0.5, 给个红包,谢谢回帖
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英语的问题还是要通过google来解决。。。。 Identity matrix(From Wikipedia, the free encyclopedia) In linear algebra, the identity matrix, or sometimes ambiguously called a unit matrix, of size n is the n × n square matrix with ones on the main diagonal and zeros elsewhere. ...... Less frequently, some mathematics books use U or E to represent the identity matrix, meaning "unit matrix"[1] and the German word Einheitsmatrix[2] respectively. 对比其他网站的一些答案,顺便贴一个elemental matrix的wiki,明确说了与单位矩阵是不同的。当然,不排除有中文教科书混用概念的 Elementary matrix(From Wikipedia, the free encyclopedia) In mathematics, an elementary matrix is a matrix which differs from the identity matrix by one single elementary row operation. 我理解是指单位矩阵上进行了一次行交换的操作得到的矩阵。这里的行交换的操作包括Row switching,Row multiplication,Row addition。也就是交换行,倍增行,倍增后加到另一行什么的,具体的查阅原文吧 |
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简单回复
2010-12-31 20:09
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