This article represents code sample that could be used to create/extract data frame with one column from existing data frame. Please feel free to comment/suggest if I missed to mention one or more important points. Also, sorry for the typos.
Extract Data Frame with One Column
In the code sample below, diamonds dataset from ggplot2 package is used. To work with the example below, one needs to load the ggplot2 library using command such as require(“ggplot2”). In the command below, method as.data.frame is used. Make a note of drop=false parameter passed to as.data.frame method.
dfn1 <- as.data.frame(diamonds[,c(1)], drop=false)
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I found it very helpful. However the differences are not too understandable for me