将data.frame列表转换为单个data.frame结构

我正在尝试将包含多个数据帧的列表重新格式化为一个数据帧。我读过很多书，但找不到实现这一目标所需的具体synthax

我有一份清单：

list1 = list(df1 = data.frame(bread = c("sourdough","baguette","boule","multigrain"), cheese = c("parmigiano","cheddar","mozzarella","stilton")), 
           df2 = data.frame(bread = c("toast","brioche","focaccia","whole wheat"), cheese = c("gorgonzola","camembert","gouda","feta")))

我要求数据框垂直堆叠，并添加一列，表示它们来自的列表元素名称，如以下示例所示：

df = data.frame(breads = c("sourdough","baguette","boule","multigrain","toast","brioche","focaccia","whole wheat"),
                cheese = c("parmigiano","cheddar","mozzarella","stilton","gorgonzola","camembert","gouda","feta"),
                factor = rep(c("df1","df2"),each = 4))

非常简单，但我无法理解它。

您可以使用

do.call(rbind,list1)

            bread     cheese
df1.1   sourdough parmigiano
df1.2    baguette    cheddar
df1.3       boule mozzarella
df1.4  multigrain    stilton
df2.1       toast gorgonzola
df2.2     brioche  camembert
df2.3    focaccia      gouda
df2.4 whole wheat       feta

编辑：

如果您想要显式的“From”col

new_df您可以尝试以下方法：

#Bind
DF <- do.call(rbind,list1)
#Create factor
DF$factor <- rownames(DF)
rownames(DF)<-NULL
DF$factor <- gsub("\\..*","",DF$factor)
DF

        bread     cheese factor
1   sourdough parmigiano    df1
2    baguette    cheddar    df1
3       boule mozzarella    df1
4  multigrain    stilton    df1
5       toast gorgonzola    df2
6     brioche  camembert    df2
7    focaccia      gouda    df2
8 whole wheat       feta    df2

#绑定
这能回答你的问题吗？嗯……这似乎适用于我给出的示例……但不是我的原始数据集。一定有什么东西我错过了。这是我原始数据集的结构（只显示了第一个元素），它们是矩阵而不是data.frames，我想这就是它的区别所在<代码>11$1:num[1:1000，1:3]0.85 0.849 0.847 0.846 0.844…的列表attr（*，“dimnames”）=2个….$的列表：chr[1:1000]“1”“2”“3”“4”chr[1:3]“fit2”“lwr2”“upr2”
好的，我想我明白了。我想是因为它们是矩阵，所以不起作用。我做了
lappy（list1，函数（x）as.data.frame（x））
然后使用了您的代码，它似乎起了作用。为了获得完全相同的结果，您可以将其缩短为
lappy（list1，as.data.frame）
#Bind
DF <- do.call(rbind,list1)
#Create factor
DF$factor <- rownames(DF)
rownames(DF)<-NULL
DF$factor <- gsub("\\..*","",DF$factor)
DF

        bread     cheese factor
1   sourdough parmigiano    df1
2    baguette    cheddar    df1
3       boule mozzarella    df1
4  multigrain    stilton    df1
5       toast gorgonzola    df2
6     brioche  camembert    df2
7    focaccia      gouda    df2
8 whole wheat       feta    df2