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How to get a number of random elements from an array?
...d suggest using Python's implementation if you are going for speed: jsperf.com/pick-random-elements-from-an-array
– Derek 朕會功夫
Aug 7 '17 at 23:29
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Reading a binary file with python
... Can you please have look at this other post? stackoverflow.com/questions/8092469/… ... I am again to read another binary file, but in this case I don't know the byte structure in details. For example, I figured out that sometimes there is the integer 8. However, with IDL it is real...
Frame Buster Buster … buster code needed
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edited Jun 20 at 9:12
Community♦
111 silver badge
answered Jun 18 '09 at 13:21
HugowareHugoware
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Error installing mysql2: Failed to build gem native extension
... replaced by ruby-mysql. This is where I found the solution.
If the above command doesn't work because libmysql-ruby cannot be found, the following should be sufficient:
sudo apt-get install libmysqlclient-dev
On Red Hat/CentOS and other distributions using yum:
sudo yum install mysql-devel
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Postgres: “ERROR: cached plan must not change result type”
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Is \d not supported by grep's basic expressions?
This does not generate any output. How come?
2 Answers
2
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MongoDB atomic “findOrCreate”: findOne, insert if nonexistent, but do not update
... specify updates which should only happen when inserting documents.
This, combined with the upsert option, means you can use findAndModify to achieve an atomic findOrCreate-like operation.
db.collection.findAndModify({
query: { _id: "some potentially existing id" },
update: {
$setOnInsert:...
Swift equivalent for MIN and MAX macros
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min and max are already defined in Swift:
func max<T : Comparable>(x: T, y: T, rest: T...) -> T
func min<T : Comparable>(x: T, y: T, rest: T...) -> T
See this great writeup on documented & undocumented built-in functions in Swift.
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How to get min/max of two integers in Postgres/SQL?
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