How to repeat a String N times in R?

StringRRepeat

String Problem Overview

In Ruby I could repeat a String n times with the following:

E.G. "my_string" * 2 -> "my_stringmy_string"

Is there an equally simple way for doing this in R?

String Solutions

Solution 1 - String

You can use replicate or rep:

replicate(2, "my_string")
# [1] "my_string" "my_string"

rep("my_string", 2)
# [1] "my_string" "my_string"

paste will put it together:

paste(replicate(2, "my_string"), collapse = "")
# [1] "my_stringmy_string"

Solution 2 - String

With R 3.3.0, we can use strrep from base R

strrep("my_string",2)
#[1] "my_stringmy_string"

We can also pass a vector of values in times

strrep("my_string",1:3)
#[1] "my_string"                   "my_stringmy_string"         
#[3] "my_stringmy_stringmy_string"

Solution 3 - String

Use stri_dup function from stringi package

stri_dup("abc",3)
[1] "abcabcabc"

It is also vectorized, so you can do this:

> stri_dup(letters[1:3],4)
[1] "aaaa" "bbbb" "cccc"

Performance comparision :)

> microbenchmark(stri_dup("abc",3),paste(replicate(3, "abc"), collapse = ""))
Unit: microseconds
                                      expr    min     lq  median     uq     max neval
                        stri_dup("abc", 3)  2.362  3.456  7.0030  7.853  64.071   100
 paste(replicate(3, "abc"), collapse = "") 57.131 61.998 65.2165 68.017 200.626   100

> microbenchmark(stri_dup("abc",300),paste(replicate(300, "abc"), collapse = ""))
    Unit: microseconds
                                            expr     min       lq   median      uq     max neval
                            stri_dup("abc", 300)   6.441   7.6995  10.2990  13.757  45.784   100
     paste(replicate(300, "abc"), collapse = "") 390.137 419.7740 440.5345 460.042 573.975   100

Solution 4 - String

The stringr library offers the function str_dup():

str_dup("my_string", 2)

[1] "my_stringmy_string"

And it is vectorized over strings and times:

str_dup(c("A", "B", "C"), 2:4)

[1] "AA"   "BBB"  "CCCC"
Categories
Recommended String Solutions
Recommended R Solutions
Recommended Repeat Solutions

Previous Solution:

Enter export password to generate a P12 certificate

Command LinePasswordsOpenssl

Next Solution:

Default values on empty user input

PythonUser InputDefault Value

Attributions

All content for this solution is sourced from the original question on Stackoverflow.

The content on this page is licensed under the Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license.

Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionMarsellus WallaceView Question on Stackoverflow
Solution 1 - StringA5C1D2H2I1M1N2O1R2T1View Answer on Stackoverflow
Solution 2 - StringakrunView Answer on Stackoverflow
Solution 3 - StringbartektartanusView Answer on Stackoverflow
Solution 4 - StringtmfmnkView Answer on Stackoverflow