I have a dataframe:
df1
a b c
1 1 0
1 1 1
1 1 1
df2
a b c d e f
1 1 0 1 1 1
1 1 1 1 1 1
1 1 1 1 1 1
2 2 2 2 2 2
How can I add new columns to df1
from df2
that aren't in df1
? to get:
df2
a b c d e f
1 1 0 0 0 0
1 1 1 0 0 0
1 1 1 0 0 0
I tried:
columns_toadd <- colnames(df1)[!(colnames(df1) %in% colnames(df2))]
for (i in 1:length(columns_toadd)){
df$columns_toadd[[i]] <- 0
}
But this just gave:
df2
a b c columns_toadd
1 1 0 0
1 1 1 0
1 1 1 0
I'd like to do this in base R as I work in an environment with limited packages.
我们可以使用setdiff
获取不在'df1'中的列名,并将它们分配给0
df1[setdiff(names(df2), names(df1))] <- 0
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