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How to randomize order of approximately 20 elements with lowest complexity? (generating random permutations)
Started by Ante on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
Generating random int list in F#
Uniformly distributed random list permutation in F# to randomise the order is to make....
You could use want.
Some months ago I blogged about obtaining a random permutation of a list of integers.
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I need to retrieve rows from a table (i.e: 'orders') ordered by a column (lets say 'user') randomly. That is, I need all orders from the same user to remain together (one after the other) and users to be ordered randomly.
Started by macaco on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
SELECT userid, RAND() as random FROM users) tmp ON orders.userid = tmp.userid ORDER BY tmp.random, tmp.userid
You'll want to order by the random number AND the user id so if two user ids get the same random number ....
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Hi
Is it possible to write SQL query that returns table rows in random order every time the query run?
Started by ArsenMkrt on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
So,
SELECT * FROM dbo.Foo ORDER BY NEWID();
To be efficient, and random, it mightAlthough not the most efficient....
Http://www.titov.net/2005/09/21/do-not-use-order-by-rand-or-how-to-get-random-rows-from-table a unique GUID.
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Ask your Facebook Friends
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How can I have the tests for my Rails app to be executed in a random order? Is there a simple solution using rake?
Started by pieroz on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
I guess you could monkey patch test unit to allow for that. .
EVIL!
Here you go, define will still be executed in the order they appear.
Cache)
Added ability to set test execution order, defaults to :random.
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I have 3 columns of data in SQL Server 2005 :
LASTNAME FIRSTNAME CITY
I want to randomly re-order these 3 columns (and munge the data) so that the data is no longer meaningful. Is there an easy way to do this? I don't want to change any data, I just want...
Started by djangofan on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
When you say "re-order" these columns lastname = (SELECT lastname FROM the_....
Works on MySQL.
Check for yours.
Select *, rand() from table order by rand();
I understand some versions of SQL have a rand() that doesn't change for each line.
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Greetings, I would like to make NUnit execute my unit tests in a random order every time in order to ensure they are isolated and FIRST . Does anyone know of a easy way to do this well without branching NUnit?
Started by ryber on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
With ReSharper? I believe it runs tests in parallel, and in a non-deterministic order, but I'm not 100% sure.
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I have the classical structure for tests, I have a test suite of different suites like DatabaseTests, UnitTests etc. Sometimes those suites contains other suites like SlowDatabaseTests, FastDatabaseTests etc.
What I want is to randomize the running order...
Started by nimcap on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Read more about the test framework and how to write your own test... .
In general what you need to do is to write your own test runner and in the test runner class aggregate the methods and randomly run each test (make sure you don't run a test twice).
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I'm using a third-party AJAX slideshow for a website that takes an RSS feed as its picture source. I would like to randomize the order of the pictures, but that's not a feature of the slideshow (or the RSS feed I'm pulling from).
Surely it shouldn't be...
Started by Mr. Brent on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
} shuffle($data);
What worked:
$dom = new DOMDocument....
$xml = new DOMDocument(); $articles = $xml->getElementsByTagName("article"); $data = array(); foreach ($articles as $article) { data[] = .. .
Are you using DOM XML ? Then just shuffle the array on import .
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Alright here's the situation, I have an application written in the Zend_Framework, that is compatible with both MySQL and MSSQL as the backend. Now, ZF is pretty good at solving a lot of the SQL discrepancies/differences between the two languages, but...
Started by Jesta on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Adapter_Mysqli) { $select->order(new Zend_Db_Expr('RAND()')); } else if ($adapter instanceOf Zend_Db_Adapter_Dblib) { $select->order(new Zend_Db_Expr('NEWID()')); } else { throw new Exception something like:
$select->order....
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I need to find names which contain three number 7 in the random order.
My attempt
We need to find first names which do not contain seven
ls | grep [^7]
Then, we could remove these matches from the whole space
ls [remove] ls | grep [^7]
The problem in ...
Started by Masi on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
How do you differentiate between the "order" when it's the same token that repeats? Is "a7b7" different from "c7d7" in the order of the 7s?
Anyway.
I don't understand the part about "random order".
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