如何将等长的向量合并到一个列表中，而相应的元素代表R中列表的单个元素？
要将三个向量组合到一个列表中，并用对应的元素表示列表中的单个元素，我们可以使用mapply函数。例如，如果我们有三个向量x，y和z，每个向量的元素数量等于一百，则可以使用mapply（c，x，y，z，SIMPLIFY=FALSE）创建具有相应元素的列表。
示例
x1<-1:20 y1<-1:20 z1<-20:1 mapply(c,x1,y1,z1,SIMPLIFY=FALSE)
输出结果
[[1]] [1] 1 1 20 [[2]] [1] 2 2 19 [[3]] [1] 3 3 18 [[4]] [1] 4 4 17 [[5]] [1] 5 5 16 [[6]] [1] 6 6 15 [[7]] [1] 7 7 14 [[8]] [1] 8 8 13 [[9]] [1] 9 9 12 [[10]] [1] 10 10 11 [[11]] [1] 11 11 10 [[12]] [1] 12 12 9 [[13]] [1] 13 13 8 [[14]] [1] 14 14 7 [[15]] [1] 15 15 6 [[16]] [1] 16 16 5 [[17]] [1] 17 17 4 [[18]] [1] 18 18 3 [[19]] [1] 19 19 2 [[20]] [1] 20 20 1
示例
x2<-rnorm(20) y2<-rnorm(20) z2<-rnorm(20) a2<-rnorm(20) b2<-rnorm(20) mapply(c,x2,y2,z2,a2,b2,SIMPLIFY=FALSE)
输出结果
[[1]] [1] 0.88030917 -0.15681801 -0.71128117 -0.06484493 0.02902034 [[2]] [1] -1.0189866 0.2922982 1.0829246 1.1930435 -0.4582951 [[3]] [1] -0.59622712 -0.48214712 0.08316515 1.74253306 -0.04677903 [[4]] [1] -0.6714311 -1.5970019 -0.1486865 0.6280077 -1.6230396 [[5]] [1] -0.31790639 1.02929693 -0.98422633 -1.18992473 0.08402105 [[6]] [1] 0.06655424 -2.12189071 1.23338511 -1.58198753 -0.82106071 [[7]] [1] 0.3982578 2.4086283 0.6761518 -1.6721258 -0.8722924 [[8]] [1] 0.0231563 0.9067107 -0.3208233 0.3420389 -0.8405606 [[9]] [1] -0.5325169 0.6372508 0.9362706 1.7724822 0.1934017 [[10]] [1] -0.03718933 -1.51224275 0.22590754 -0.68509725 -0.05675418 [[11]] [1] 0.6721130 -0.0163331 -1.2063054 -0.6187888 -0.9994600 [[12]] [1] -0.63104688 0.08017714 -0.01677552 -1.32654309 -0.28477733 [[13]] [1] -0.7466293 -1.0290986 0.1239188 0.5020038 -0.6060167 [[14]] [1] -1.03619822 -0.01400334 -1.24066001 -0.14693990 0.84074405 [[15]] [1] -1.1087838 0.4577026 -0.1660513 0.4572123 0.1333066 [[16]] [1] 0.4870503 0.8694689 0.4490408 0.5883133 -0.3761401 [[17]] [1] 0.08145911 1.12753332 -1.26155664 -1.22535972 -0.75051785 [[18]] [1] 0.4706167 -0.8978908 -1.3874243 -0.1189644 0.1072799 [[19]] [1] 0.4461086 -0.5202976 1.0085317 -0.3409258 0.4308268 [[20]] [1] -0.4163482 -0.2803990 0.2045526 1.2416159 -0.1843258
示例
x3<-rpois(20,5) y3<-rpois(20,5) z3<-rpois(20,5) mapply(c,x3,y3,z3,SIMPLIFY=FALSE)
输出结果
[[1]] [1] 4 4 5 [[2]] [1] 2 3 4 [[3]] [1] 9 7 5 [[4]] [1] 3 2 4 [[5]] [1] 7 2 3 [[6]] [1] 1 4 3 [[7]] [1] 5 6 5 [[8]] [1] 8 4 2 [[9]] [1] 7 1 4 [[10]] [1] 7 4 4 [[11]] [1] 7 8 5 [[12]] [1] 3 3 3 [[13]] [1] 3 1 2 [[14]] [1] 2 2 7 [[15]] [1] 8 7 6 [[16]] [1] 7 7 4 [[17]] [1] 5 5 11 [[18]] [1] 6 7 6 [[19]] [1] 6 7 2 [[20]] [1] 6 7 7