CODEWITHSUNDEEP
rstata
bill999
bill999

Reputation: 2529

R equivalent of Stata *

In Stata, if I have these variables: var1, var2, var3, var4, var5, and var6, I can select all of them with the command var*. Does R have a similar functionality?

Upvotes: 5

Views: 2168

Answers (2)

A5C1D2H2I1M1N2O1R2T1
A5C1D2H2I1M1N2O1R2T1

Reputation: 193517

The select function from the "dplyr" package offers several flexible ways to select variables. For instance, using @Marius's sample data, try the following:

library(dplyr)
df %>% select(starts_with("var"))        # At the start
df %>% select(num_range("var", 1:3))     # specifying range
df %>% select(num_range("var", c(1, 3))) # gaps are allowed

Upvotes: 12

Marius
Marius

Reputation: 60070

You can grep to do this kind of regexp matching among the column names:

x = c(1, 2, 3)
df = data.frame(var1=x, var2=x, var3=x, other=x)
df[, grep("var*", colnames(df))]

Output:

  var1 var2 var3
1    1    1    1
2    2    2    2
3    3    3    3

So, basically just making use of the usual df[rows_to_keep, columns_to_keep] indexing syntax, and feeding in the results of grep as the columns_to_keep.

Upvotes: 7

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