同时在R中的两个列表上循环 [英] Loop simultaneously over two lists in R

问题描述

我编写了一个带有三个参数的函数:

I have written a function that takes three arguments:

create.template <- function(t.list, x, y){
    temp <- cbind(get(t.list[x]), get(t.list[y]), NA)
}

此函数的输出是一个11列17行的data.frame.

The output of this function is a data.frame with 11 columns and 17 rows.

现在，我想用两个列表在函数上创建一个循环，一个用于x，一个用于y.从而

Now I would like to create a loop over the function with two lists, one for x and one for y. Thereby

x.list <- list(1,2,3)
y.list <- list(4,5,6)

在最后一步中，我想建立类似的东西

In the final step I would like to establish something like

for (x in x.list and y in y.list){
   create.template(t.list, x, y)
}

，并有可能在一个最终数据帧中按行组合生成的数据帧(3个数据帧，每个11列).

and possibly combine the resulting dataframes (3 dataframes with 11 columns each) rowwise in one final dataframe.

我知道您可以使用zip()函数在Python中执行此操作，然后通过append()和concatenate()轻松附加结果，但是到目前为止，我还没有找到R中的等效项.非常感谢您的帮助！

I know that you can do this in Python with the zip() function and then append the results easily by append() and concatenate(), but I have not found an equivalent in R so far. Any help is highly appreciated!

推荐答案

我们可以使用 mget 获取多个对象的值，或者使用 Reduce 或 do.call 绑定到 vectors

We can get the values of multiple objects with mget, use either Reduce or do.call to cbind the list of vectors

Reduce(cbind, c(mget(ls(pattern = "\\.list")), NA))

或

do.call(cbind, c(mget(c("x.list", "y.list")), NA))

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