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Append an object to a list in R in amortized constant time, O(1)?
...ly seem to suggest that the a <- list(a, list(i)) method is fastest, at least for a problem size of 10000, but the results for a single problem size do not address the growth of the solution. For that, we need to run a minimum of two profiling tests, with differing problem sizes:
> runBenchma...
req.query and req.param in ExpressJS
Suppose a client sends say Android (Key,value) pair in the request ........ which one to use ?
4 Answers
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Angular ng-repeat Error “Duplicates in a repeater are not allowed.”
...ason this error happens is that angular is using a dictionary to store the id of an item as the key with the value as the DOM reference. From the code (line 15402 in angular.js) it looks like they are caching previously found DOM elements based on their key as a performance optimization. Since they...
How to filter array in subdocument with MongoDB [duplicate]
...wind the list array before applying the $match so that you can filter individual elements and then use $group to put it back together:
db.test.aggregate([
{ $match: {_id: ObjectId("512e28984815cbfcb21646a7")}},
{ $unwind: '$list'},
{ $match: {'list.a': {$gt: 3}}},
{ $group: {_id:...
how to emulate “insert ignore” and “on duplicate key update” (sql merge) with postgresql?
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Try to do an UPDATE. If it doesn't modify any row that means it didn't exist, so do an insert. Obviously, you do this inside a transaction.
You can of course wrap this in a function if you don't want to put the extra code on the client side. You also need a loop for the very rare race con...
Recommendations of Python REST (web services) framework? [closed]
...mendations of different Python-based REST frameworks for use on the serverside to write your own RESTful APIs? Preferably with pros and cons.
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Draw a perfect circle from user's touch
... that anything I've said above will work or be efficient, but I hope it at least gets you on the right track—and please, if anyone who knows more about shape recognition than me (which is a very low bar) sees this, feel free to post a comment or your own answer.
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How to run functions in parallel?
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I used your code but the functions still didn't start at the same time.
– lmcadory
Aug 26 '11 at 16:26
4
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Random “Element is no longer attached to the DOM” StaleElementReferenceException
...ons it's because your tests are poorly written. It's a race condition. Consider the following scenario:
WebElement element = driver.findElement(By.id("foo"));
// DOM changes - page is refreshed, or element is removed and re-added
element.click();
Now at the point where you're clicking the element...
How to convert array to SimpleXML
...e array_flip won't work as it can't flip arrays (like the another_array inside the main array).
– Lode
Jun 6 '11 at 9:56
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