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How to find common elements from multiple vectors?

Can anyone tell me how to find the common elements from multiple vectors?开发者_StackOverflow中文版[详细]

2023-01-16 07:57 分类：问答
Grouping functions (tapply, by, aggregate) and the *apply family

Whenever I want to do something \"map\"py in R, I usually try to use a function in the apply family.[详细]

2023-01-12 12:28 分类：问答
How to convert a factor to integer\numeric without loss of information?

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.[详细]

2023-01-10 04:52 分类：问答
Combine two data frames by rows (rbind) when they have different sets of columns

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[详细]

2023-01-09 22:50 分类：问答
Order discrete x scale by frequency/value

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[详细]

2023-01-07 01:35 分类：问答
Using R to download zipped data file, extract, and import data

@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\"[详细]

2023-01-03 11:57 分类：问答
Speed up the loop operation in R

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[详细]

2022-12-31 20:25 分类：问答
Create categorical variable in R based on range

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[详细]

2022-12-26 19:10 分类：问答
Convert a dataframe to a vector (by rows)

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))[详细]

2022-12-24 22:05 分类：问答
Understanding the order() function

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.[详细]

2022-12-21 11:08 分类：问答