"repeat" refers to the action of doing something over again.
Note that this tag can often be replaced by the more specific loops or recursion tags.
Questions tagged [repeat]
3161 questions
842
votes
24 answers
Repeat a string in JavaScript a number of times
In Perl I can repeat a character multiple times using the syntax:
$a = "a" x 10; // results in "aaaaaaaaaa"
Is there a simple way to accomplish this in Javascript? I can obviously use a function, but I was wondering if there was any built in…
Steve
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614
votes
25 answers
Create an array with same element repeated multiple times
In Python, where [2] is a list, the following code gives this output:
[2] * 5 # Outputs: [2,2,2,2,2]
Does there exist an easy way to do this with an array in JavaScript?
I wrote the following function to do it, but is there something shorter or…
Curious2learn
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254
votes
15 answers
Repeat string to certain length
What is an efficient way to repeat a string to a certain length? Eg: repeat('abc', 7) -> 'abcabca'
Here is my current code:
def repeat(string, length):
cur, old = 1, string
while len(string) < length:
string += old[cur-1]
cur…
John Howard
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153
votes
3 answers
vim repeat find next character 'x'
I often navigate in vim by f x to find next occurrence of character 'x',
but overlook that there is a word (or more words) containing 'x' in between the word I want to edit and the beginning cursor position.
So i have to f x again, which is kind of…
epsilonhalbe
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130
votes
8 answers
Do something every x minutes in Swift
How can I run a function every minute?
In JavaScript I can do something like setInterval, does something similar exist in Swift?
Wanted output:
Hello World once a minute...
JOSEFtw
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123
votes
10 answers
Repeat rows of a data.frame
I want to repeat the rows of a data.frame, each N times. The result should be a new data.frame (with nrow(new.df) == nrow(old.df) * N) keeping the data types of the columns.
Example for N = 2:
A B C
A B C 1…
Stefan
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102
votes
3 answers
Create sequence of repeated values, in sequence?
I need a sequence of repeated numbers, i.e. 1 1 ... 1 2 2 ... 2 3 3 ... 3 etc. The way I implemented this was:
nyear <- 20
names <- c(rep(1,nyear),rep(2,nyear),rep(3,nyear),rep(4,nyear),
…
Wesley Burr
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97
votes
5 answers
How to capture an arbitrary number of groups in JavaScript Regexp?
I would expect this line of JavaScript:
"foo bar baz".match(/^(\s*\w+)+$/)
to return something like:
["foo bar baz", "foo", " bar", " baz"]
but instead it returns only the last captured match:
["foo bar baz", " baz"]
Is there a way to get all the…
disc0dancer
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78
votes
7 answers
How to repeat a Pandas DataFrame?
This is my DataFrame that should be repeated for 5 times:
>>> x = pd.DataFrame({'a':1,'b':2}, index = range(1))
>>> x
a b
0 1 2
I want to have the result like this:
>>> x.append(x).append(x).append(x)
a b
0 1 2
0 1 2
0 1 2
0 1 …
lsheng
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75
votes
4 answers
do-while loop in R
I was wondering about how to write do-while-style loop?
I found this post:
you can use repeat{} and check conditions whereever using if() and
exit the loop with the "break" control word.
I am not sure what it exactly means. Can someone please…
Tim
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75
votes
4 answers
Repeat and concatenate a string N times
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?
Marsellus Wallace
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70
votes
4 answers
Using explicitly numbered repetition instead of question mark, star and plus
I've seen regex patterns that use explicitly numbered repetition instead of ?, * and +, i.e.:
Explicit Shorthand
(something){0,1} (something)?
(something){1} (something)
(something){0,} (something)*
(something){1,} …
polygenelubricants
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68
votes
10 answers
How can I replicate rows of a Pandas DataFrame?
My pandas dataframe looks like this:
Person ID ZipCode Gender
0 12345 882 38182 Female
1 32917 271 88172 Male
2 18273 552 90291 Female
I want to replicate every row 3 times and reset the index to get:
Person ID …
DasVisual
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68
votes
6 answers
How can I repeat a string N times in Perl?
In Python, if I do this:
print "4" * 4
I get
> "4444"
In Perl, I'd get
> 16
Is there an easy way to do the former in Perl?
izb
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votes
5 answers
How do I repeat any command in Vim, like "C-x z" in emacs?
In Vim, is there any way to repeat the last command regardless of whether it was an edit or not, and without having the foresight to first record a macro?
E.g. say I type :bn, and want to do it again (it was the wrong file). Pressing . obviously…
johv
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