要将 R 数据帧中矩阵中大于阈值的值转换为 1，我们可以按照以下步骤操作 -
首先，创建一个矩阵。
然后，使用 ifelse 函数将大于阈值的值转换为 1。
让我们创建一个矩阵，如下所示 -
M<-matrix(rnorm(50),ncol=2) M输出结果
执行时，上述脚本生成以下内容output(this output will vary on your system due to randomization)-
[,1] [,2] [1,] 1.35131510 1.37522054 [2,] -1.13345162 0.36286206 [3,] 0.63015182 -0.03290929 [4,] 0.92621651 1.31680036 [5,] -0.82421679 0.32648195 [6,] 0.97343371 -1.07267437 [7,] 1.64987699 -0.78395936 [8,] -1.26893096 -0.86729417 [9,] 1.43618275 -0.35711054 [10,] 0.47313589 1.33716595 [11,] -0.62682302 -0.11872530 [12,] -1.55459406 0.60669510 [13,] 0.71674609 0.38263617 [14,] 0.15818009 0.40835948 [15,] -0.63320156 -0.06941598 [16,] -0.18245803 -0.69972541 [17,] -0.83207399 -2.18994824 [18,] -0.50880490 -1.11029099 [19,] 0.09978232 0.84119858 [20,] -0.53728939 -0.42712942 [21,] 0.78737850 0.64063631 [22,] -0.54197740 1.52800265 [23,] 0.64130714 0.03383875 [24,] 0.54300424 -0.48200610 [25,] -0.91642041 -0.27952213
将大于阈值的值转换为 1
使用 ifelse 函数将大于阈值的值转换为矩阵 M 的第 1 列中的 1 -
M<-matrix(rnorm(50),ncol=2) M[,1]<-ifelse(M[,1]>0.5,1,M[,1]) M输出结果
[,1] [,2] [1,] 1.00000000 1.37522054 [2,] -1.13345162 0.36286206 [3,] 1.00000000 -0.03290929 [4,] 1.00000000 1.31680036 [5,] -0.82421679 0.32648195 [6,] 1.00000000 -1.07267437 [7,] 1.00000000 -0.78395936 [8,] -1.26893096 -0.86729417 [9,] 1.00000000 -0.35711054 [10,] 0.47313589 1.33716595 [11,] -0.62682302 -0.11872530 [12,] -1.55459406 0.60669510 [13,] 1.00000000 0.38263617 [14,] 0.15818009 0.40835948 [15,] -0.63320156 -0.06941598 [16,] -0.18245803 -0.69972541 [17,] -0.83207399 -2.18994824 [18,] -0.50880490 -1.11029099 [19,] 0.09978232 0.84119858 [20,] -0.53728939 -0.42712942 [21,] 1.00000000 0.64063631 [22,] -0.54197740 1.52800265 [23,] 1.00000000 0.03383875 [24,] 1.00000000 -0.48200610 [25,] -0.91642041 -0.27952213