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How to count the number of set bits in a 32-bit integer?
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This is known as the 'Hamming Weight', 'popcount' or 'sideways addition'.
The 'best' algorithm really depends on which CPU you are on and what your usage pattern is.
Some CPUs have a single built-in instruction to do it and others hav...
What's the fastest way to merge/join data.frames in R?
...version.string
# R version 2.15.1 (2012-06-22)
Please note that I don't know plyr well so please do check with Hadley before relying on the plyr timings here. Also note that the data.table do include the time to convert to data.table and set the key, for fareness.
This answer has been updated s...
Tactics for using PHP in a high-load site
...me as (sigh) an alien that has just landed on the planet, albeit one that knows PHP and a few optimisation techniques.
23 A...
MySql export schema without data
I'm using a MySql database with a Java program, now I want to give the program to somebody else.
13 Answers
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How to hide Soft Keyboard when activity starts
...an Edittext with android:windowSoftInputMode="stateVisible" in Manifest. Now the keyboard will be shown when I start the activity. How to hide it? I cannot use android:windowSoftInputMode="stateHidden because when keyboard is visible then minimize the app and resume it the keyboard should be vis...
How does Java handle integer underflows and overflows and how would you check for it?
...eld a negative value, so an overflow occurs if arg1 + arg2 > MAX_VALUE. Now the maximum value that could result would be MAX_VALUE + MAX_VALUE (the extreme case both arguments are MAX_VALUE). For a byte (example) that would mean 127 + 127 = 254. Looking at the bit representations of all values th...
How do I get the directory from a file's full path?
...ing a relative name. I hadn't spotted that the path will be absolute. I've now got both versions :)
– Jon Skeet
Mar 23 '09 at 17:57
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How can I check if a checkbox is checked?
... didn't check it! Let me check it for you.");
}
}
Your script doesn't know what the variable remember is. You need to get the element first using getElementById().
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Convert string to number and add one
...menter on a second line to be more compact.
– Chris Snowden
Oct 6 '11 at 13:04
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A regular expression to exclude a word/string
...h words, you need a conjuction:
^/(?!ignoreme$)(?!ignoreme2$)[a-z0-9]+$
Now both conditions must be true (neither ignoreme nor ignoreme2 is allowed) to have a match.
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