[英]Lapplying a function over two lists of dataframes in R
I've got two lists of dataframes: list_A
and list_B
.我有两个数据框列表:
list_A
和list_B
。 I want to take in consecutive dataframes from list_A
and list_B
and apply a custom function to them ( my_function
).我想从
list_A
和list_B
中获取连续的数据帧,并对它们应用自定义 function ( my_function
)。
This works as desired:这可以按需要工作:
my_function(list_A[[1]], list_B[[1]])
my_function(list_A[[2]], list_b[[2]])
...
However, I don't know how to do with lapply
so that I don't have to type in the number each time (I have several hundred elements).但是,我不知道如何处理
lapply
这样我就不必每次都输入数字(我有几百个元素)。 Also, I would like the results to be written to one list.另外,我希望将结果写入一个列表。
mapply
would do what you need, for example: mapply
会做你需要的,例如:
myfunction <- sum
mapply(myfunction, list(1, 2, 3), list(10,20,30))
# [1] 11 22 33
Here, we could use Map
from base R
to apply the function on the corresponding elements of both the list
s在这里,我们可以使用
base R
Map
的 Map 将 function 应用于两个list
的相应元素
out <- Map(my_function, list_A, list_B)
lapply
can also be used, if we loop over the sequence of one of the list
如果我们遍历
list
之一的序列,也可以使用lapply
out <- lapply(seq_along(list_A), function(i)
my_function(list_A[[i]], list_B[[i]]))
which is similar to using a for
loop这类似于使用
for
循环
out <- vector('list', length(list_A))
for(i in seq_along(list_A)) out[[i]] <- my_function(list_A[[i]], list_B[[i]])
Perhaps you can vectorize my_function
via Vectorize
, eg,也许您可以通过
Vectorize
对my_function
进行矢量化,例如,
Vectorize(my_function)(list_A,list_B)
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.