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Append an object to a list in R in amortized constant time, O(1)?
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edited Apr 28 '16 at 18:24
smci
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answered Mar ...
quick random row selection in Postgres
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edited Nov 13 '15 at 4:28
Antony Hatchkins
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Iterate over a list of files with spaces
... a for loop
– Derrick
Aug 18 '11 at 4:13
15
This will split a single file path that contains a \n...
Print all but the first three columns
...tion that does not add extra leading or trailing whitespace:
awk '{ for(i=4; i<NF; i++) printf "%s",$i OFS; if(NF) printf "%s",$NF; printf ORS}'
### Example ###
$ echo '1 2 3 4 5 6 7' |
awk '{for(i=4;i<NF;i++)printf"%s",$i OFS;if(NF)printf"%s",$NF;printf ORS}' |
tr ' ' '-'
4-5-6-7
Sudo...
Repeat Character N Times
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1245
These days, the repeat string method is implemented almost everywhere. (It is not in Internet E...
Get the first N elements of an array?
... array indices. You need the preserve_keys flag set to trueto avoid this. (4th parameter, available since 5.0.2).
Example:
$output = array_slice($input, 2, 3, true);
Output:
array([3]=>'c', [4]=>'d', [5]=>'e');
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When is each sorting algorithm used? [closed]
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dsimchadsimcha
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Java String split removed empty values
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answered Jan 30 '13 at 10:44
jlordojlordo
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Strange \n in base64 encoded string in Ruby
The inbuilt Base64 library in Ruby is adding some '\n's. I'm unable to find out the reason. For this special example:
6 Ans...
Best way to check for “empty or null value”
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edited Jun 26 at 22:40
answered May 20 '14 at 18:47
E...