我有一个包含1000个元素的列表，其元素是100个值的向量。我想对这些元素求和，但每次列表都有与输出相同的值。怎么办呢？
[[1]]
[1] ....
...
[[1000]]
[1] 41.796588400 1.822177817 0.516105021 16.554318711 22.441116192 11.557223237
[7] 11.610201393 14.126722844 11.165417165 17.024791387 97.744736046 1.053429931
[13] 5.409970556 10.534262466 2.402112926 61.989253054 89.141315737 7.831002594
[19] 0.229311742 1.167366732 74.131595409 26.837412033 0.315262754 3.662595556
[25] 7.621307733 6.599907692 2.436551709 50.371429645 0.046652228 84.050028030
[31] 2.547629448 8.308966616 9.566100355 1.324906725 35.296845475 80.754003596
[37] 53.073032197 0.506524295 0.478822391 14.147898302 0.292336489 45.329947475
[43] 25.455486564 20.790057839 12.622231025 38.933121408 41.196719977 3.762513880
[49] 88.326438565 0.006009079 18.974940292 18.964924610 4.299943187 0.266114761
[55] 16.597228049 1.030058767 15.304970202 12.220887655 2.229263654 18.506392124
[61] 8.455070746 0.000839928 0.621677398 16.936509072 10.599982129 5.542332913
[67] 0.773795046 20.199178278 33.488631341 4.624800890 0.069347211 11.352912859
[73] 20.614961806 2.986133970 1.185518764 33.563723467 15.468933119 2.360548396
[79] 8.237662458 50.279689216 1.307944799 17.654806254 42.129699374 2.352254185
[85] 1.069597812 12.714936626 4.677094902 0.085737588 11.653287453 15.610804195
[91] 5.489030702 0.202041121 2.849800157 5.284956342 0.128010723 5.731836865
[97] 3.635845442 11.560654785 0.800697847 0.719558593
答案 0 :(得分：0)
不是那么简单：
lapply(x, sum)
？这是我得到的：
> x <- list(rep(1,100), rep(2,100), rep(3,100))
> lapply(x,length)
[[1]]
[1] 100
[[2]]
[1] 100
[[3]]
[1] 100
> lapply(x,head)
[[1]]
[1] 1 1 1 1 1 1
[[2]]
[1] 2 2 2 2 2 2
[[3]]
[1] 3 3 3 3 3 3
> lapply(x,sum)
[[1]]
[1] 100
[[2]]
[1] 200
[[3]]
[1] 300