如何舍入R中的矩阵值？
要舍入矩阵值，我们可以使用 round 函数。
例如，如果我们有一个名为 M 的矩阵，并且我们想使用以下命令将 M 中的值四舍五入到 2 个小数位 -
M<-round(M,3)
示例 1
以下代码段创建了一个示例矩阵 -
M1<-matrix(rnorm(60),ncol=3)M1
创建以下矩阵 -
[,1] [,2] [,3][1,] -1.0065099 0.42090379 0.16908864
[2,] -0.9034180 0.04851710 1.99757669
[3,] 0.9446946 -0.64459616 -0.05651909
[4,] 0.8005215 0.83892594 0.20206176
[5,] -1.3526208 1.01668769 0.24246712
[6,] 0.8749366 -0.97465448 -2.08143783
[7,] 0.4345922 0.09487058 -0.44182193
[8,] -0.9510890 -0.66812782 0.57973760
[9,] -0.9277041 1.70982550 1.86352019
[10,] -0.4996847 1.95912699 0.43636559
[11,] -0.4127734 -0.88863671 0.28843873
[12,] -0.7470326 0.37128013 -2.03441389
[13,] -0.9018772 -0.29365294 -0.25490999
[14,] -1.0672464 1.90360060 -0.37672929
[15,] 0.1210364 -0.76459234 -0.39797807
[16,] -0.1184469 1.26720271 0.73788208
[17,] 0.1479814 -0.97256445 -1.59624932
[18,] 1.2248650 0.14759500 1.37837572
[19,] 1.6743637 0.14866853 0.24055145
[20,] 0.5748317 0.07914620 0.46610331
要将 M1 中的值四舍五入到上面创建的数据框中的三个小数位，请将以下代码添加到上面的代码段中 -
M1<-matrix(rnorm(60),ncol=3)输出结果M1<-round(M1,3)
M1
如果您将上述所有给定的片段作为单个程序执行，它会生成以下输出 -
[,1] [,2] [,3][1,] -1.007 0.421 0.169
[2,] -0.903 0.049 1.998
[3,] 0.945 -0.645 -0.057
[4,] 0.801 0.839 0.202
[5,] -1.353 1.017 0.242
[6,] 0.875 -0.975 -2.081
[7,] 0.435 0.095 -0.442
[8,] -0.951 -0.668 0.580
[9,] -0.928 1.710 1.864
[10,] -0.500 1.959 0.436
[11,] -0.413 -0.889 0.288
[12,] -0.747 0.371 -2.034
[13,] -0.902 -0.294 -0.255
[14,] -1.067 1.904 -0.377
[15,] 0.121 -0.765 -0.398
[16,] -0.118 1.267 0.738
[17,] 0.148 -0.973 -1.596
[18,] 1.225 0.148 1.378
[19,] 1.674 0.149 0.241
[20,] 0.575 0.079 0.466
示例 2
以下代码段创建了一个示例矩阵 -
M2<-matrix(runif(40,2,5),ncol=2)M2
创建以下矩阵 -
[,1] [,2][1,] 4.200955 3.384460
[2,] 4.677737 2.837406
[3,] 3.769280 3.849745
[4,] 2.969764 2.735219
[5,] 4.144210 2.135855
[6,] 2.826166 2.846861
[7,] 3.038215 3.732255
[8,] 3.452157 3.116253
[9,] 2.635194 3.037327
[10,] 2.573566 4.542331
[11,] 4.441132 4.298901
[12,] 3.996963 4.486278
[13,] 2.829070 4.067829
[14,] 4.722787 3.762698
[15,] 2.624773 4.173573
[16,] 2.425940 3.745760
[17,] 2.388542 2.652648
[18,] 2.845289 2.322316
[19,] 4.001353 4.301136
[20,] 2.827143 4.986207
要将 M2 中的值四舍五入到上面创建的数据框中的两位小数，请将以下代码添加到上面的代码段中 -
M2<-matrix(runif(40,2,5),ncol=2)输出结果M2<-round(M2,2)
M2
如果您将上述所有给定的片段作为单个程序执行，它会生成以下输出 -
[,1] [,2][1,] 4.20 3.38
[2,] 4.68 2.84
[3,] 3.77 3.85
[4,] 2.97 2.74
[5,] 4.14 2.14
[6,] 2.83 2.85
[7,] 3.04 3.73
[8,] 3.45 3.12
[9,] 2.64 3.04
[10,] 2.57 4.54
[11,] 4.44 4.30
[12,] 4.00 4.49
[13,] 2.83 4.07
[14,] 4.72 3.76
[15,] 2.62 4.17
[16,] 2.43 3.75
[17,] 2.39 2.65
[18,] 2.85 2.32
[19,] 4.00 4.30
[20,] 2.83 4.99
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