作者Arashinoon (阿辣洗)
看板NTUE-CS102
标题[闲聊] 交大资工 线代 多选三
时间Wed Feb 6 01:10:44 2013
觉得PO到ASK版有点智障 所以先问一下你们
3. There are many types of elementary matrices. Which of the following
definitions are elementary matrices? (I:identity matrix)
A. An nxn matrix is obtained by interchanging two rows of I.
B. An nxn matrix is obtained by multiplying a row of I by a nonzero constant.
C. An nxn matrix is obtained from I by adding a multiple of one row to another
row.
D. An nxn matrix is formed from I by reordering its columns.
E. 以上皆TRUE
这题问的是定义
因为我以为D重新排列行也是 elementary matrices
是因为重新排列不一定只换两行 所以不能选?
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 111.252.196.248
1F：→ gcobc12632:对 02/06 01:17
2F：推 godhand0629:基本矩阵指的是由单位矩阵进行 "一次" 基本 "列" 运算 02/06 11:44
3F：→ godhand0629:要让"行"重新排列 自己想想看绝对超过一次的"列"运算 02/06 11:45
4F：推 WAYS22275:第一次觉得楼上名符帐号 02/06 17:24
5F：→ godhand0629:ASK板还真有人问这题ㄟ = = 02/14 17:02