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) M1<-round(M1,3) M1输出结果
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) M2<-round(M2,2) M2输出结果
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