Can anyone tell me how to find the common elements from multiple vectors?开发者_StackOverflow中文版
Whenever I want to do something \"map\"py in R, I usually try to use a function in the apply family.
When I convert a factor to a nume开发者_JAVA百科ric or integer, I get the underlying level codes, not the values as numbers.
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 am making a dodged bar chart using ggplot with discrete x开发者_如何学运维 scale, the x axis are now arranged in alphabetical order, but I need to rearrange it so that it is ordered by the value of
@EZGraphs on Twitter writes: \"Lots of online csvs are zipped. Is there a way to download, unzip the archive, and load the data to a data.frame using R? #Rstats\"
I have a big performance problem in R. I wrote a function that iterates over a data.frame object. It simply adds a new column to a data.frame and accumulates something. (simple operation). The data.fr
I have a dataframe with a column of integers that I would like to use as a reference to make a new categorical variable.I want to divide t开发者_开发知识库he variable into three groups and set the ran
I h开发者_C百科ave a dataframe with numeric entries like this one test <- data.frame(x = c(26, 21, 20), y = c(34, 29, 28))
I\'m trying to understand how the order() function works.I was under the impression that it returned a permutation of indices, which when sorted开发者_Python百科, would sort the original vector.
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