【转】R函数 |
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版权声明:本文为博主原创文章,遵循 CC 4.0 BY-SA 版权协议,转载请附上原文出处链接和本声明。本文链接:https://blog.csdn.net/lili_wuwu/article/details/51909229 diag()提取或替换一个矩阵的对角线,或构造一个对角矩阵。 语法: diag(x = 1, nrow, ncol) diag(x) x x [,1] [,2] [,3] [,4] [1,] 1 5 9 13 [2,] 2 6 10 14 [3,] 3 7 11 15 [4,] 4 8 12 16 > diag(x) [1] 1 6 11 16 #展示x的对角线数据 > diag(diag(x)) [,1] [,2] [,3] [,4] [1,] 1 0 0 0 [2,] 0 6 0 0 [3,] 0 0 11 0 [4,] 0 0 0 16#由x的对角线数据生成对角矩阵 > diag(4) [,1] [,2] [,3] [,4] [1,] 1 0 0 0 [2,] 0 1 0 0 [3,] 0 0 1 0 [4,] 0 0 0 1 #对角线为4个元素每个元素默认为1的对角矩阵 > diag(10,3,4) [,1] [,2] [,3] [,4] [1,] 10 0 0 0 [2,] 0 10 0 0 [3,] 0 0 10 0 #对角线数据位10,三行四列的矩阵 > a a [,1] [,2] [,3] [,4] [1,] 2 1 1 1 [2,] 1 2 1 1 [3,] 1 1 2 1 [4,] 1 1 1 2
看几个较复杂的例子 例1 > all(diag(1:3) == {m |
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