Where can I find information on the differences between calling on a column within a data.frame via: df <- data.frame(x=1:20,y=lett开发者_StackOverflowers[1:20],z=20:1)
Is it possible to row bind two data frames that don\'t have the same set of columns?I 开发者_StackOverflow中文版am hoping to retain the columns that do not match after the bind.rbind.fill from the pac
I 开发者_JAVA百科have a data frame containing (in random places) a character value (say \"foo\") that I want to replace with a NA.
I am using R to open up some saved .csv files in a particular pairwise manner and perform a statistical test (mantel.rtest, found in the package \"ade4\").The .csv files are sequentially named as eith
I have a data.frame that looks like this > head(df) MemoryMemoryMemoryMemoryMemoryNaiveNaive 104725016.0757145.8989296.6449466.0239016.3321268.0879447.520194
I am passing data from C# to R over a COM interface. When the data arrives in R it is housed in a \'Matrix\'. Some of the functions that I use require that the data be inside a \'DataFrame\' instead.
Suppose that you have a data frame with many rows and many columns. The columns have names. You want to acce开发者_运维技巧ss rows by number, and columns by name.
I\'m using reshape in R to compute aggregate statistics over columns of a data.frame. Here\'s my data.frame:
This question already has answers here: 开发者_如何学Go How to get ranks with no gaps when there are ties among values?
When I try to remove the last row from a single column data frame, I get a vector back instead of a data frame:
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