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How can I remove all objects but one from the workspace in R?
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Likewise, click the Name box, which selects all the files, and then deselect all the files you want to keep.
– Stephen
Dec 27 '17 at 15:18
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What is an index in SQL?
...e file the value is stored.
In MySQL you can use EXPLAIN in front of your SELECT statement to see if your query will make use of any index. This is a good start for troubleshooting performance problems. Read more here:
http://dev.mysql.com/doc/refman/5.0/en/explain.html
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Generating Random Passwords
...axValue is not evenly divisible by characterArray.Length then the randomly selected characters will not be evenly distributed (though this will be a very small effect).
– Jeff Walker Code Ranger
Aug 19 '14 at 17:24
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How to identify unused css definitions
...xtension Dust-Me at https://addons.mozilla.org/en-US/firefox/addon/dust-me-selectors/.
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Curly braces in string in PHP
...s the code I got from one wordpress plugin
$data = $wpdb->get_results("select * from {$wpdb->prefix}download_monitor_files");
This is really handy technique for formatting complex strings.
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Reverse engineering from an APK file to a project
...APK feature from Android studio 2.2 version
Build -> Analyze APK -> Select your APK -> it give results
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Auto code completion on Eclipse
...t auto completion as you type, but also it support import package once you select the auto completion.
Before someone said "Eclipse is free", note that IntelliJ has free community edition as well: www.jetbrains.com/idea/download/
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Forcing a WPF tooltip to stay on the screen
...to persist longer without further fanfare. Doing this still allows you to selectively apply a smaller value in context-specific places, as well, exactly as in the other answer. (But as always, this is only valid if you are the application -- if you're writing a control library or something else th...
HashSet versus Dictionary w.r.t searching time to find if an item exists
...value);
}
var testPoints = Enumerable.Repeat(1, TestReps).Select(_ => rand.Next()).ToArray();
var timer = new Stopwatch();
var total = 0;
timer.Restart();
for (int i = 0; i < TestReps; i++)
{
var newKey =...
Generate random numbers uniformly over an entire range
... 32767 values in the range, and the remaining 4017233 values will never be selected by this algorithm.
– Mooing Duck
Aug 1 '13 at 18:28
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