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Is there any particular difference between intval and casting to int - `(int) X`?
...) can be passed a base from which to convert. (int) cannot.
int intval( mixed $var [, int $base = 10 ] )
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Ruby: How to iterate over a range, but in set increments?
...html#M000695 for the full API.
Basically you use the step() method. For example:
(10..100).step(10) do |n|
# n = 10
# n = 20
# n = 30
# ...
end
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Setting environment variables via launchd.conf no longer works in OS X Yosemite/El Capitan/macOS Sie
...environment.plist file in ~/Library/LaunchAgents/ with this content:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
&l...
Fastest way to replace NAs in a large data.table
...alue=0) { v[is.na(v)] = value; v }
for (i in names(dt))
eval(parse(text=paste("dt[,",i,":=na.replace(",i,")]")))
}
system.time(a_gdata = f_gdata(dt1))
user system elapsed
18.805 12.301 134.985
system.time(a_andrie = f_andrie(dt1))
Error: cannot allocate vector of size 305.2 Mb
Timin...
C++ deprecated conversion from string constant to 'char*'
...conversion from const char* to char* is generally not possible without an explicit cast for safety reasons. But for backwards compatibility with C the language C++ still allows assigning a string literal to a char* and gives you a warning about this conversion being deprecated.
So, somewhere you ar...
You have already activated X, but your Gemfile requires Y
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Using bundle exec is the right way to do this.
Basically what's happening is that you've updated rake to 0.9.2 which now conflicts with the version specified in your Gemfile. Previously the latest version of rake you had matched the versi...
Javascript sort array by two fields
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great short cut! helped me put a more complex solution together.. stackoverflow.com/questions/6101475/…
– Joseph Poirier
Jul 11 '19 at 19:02
3
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Is there a query language for JSON?
Is there a (roughly) SQL or XQuery-like language for querying JSON?
22 Answers
22
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What does “./bin/www” do in Express 4.x?
I just started to learn about Express 4.0 in my Node.js app, and I found that it generated ./bin/www file, on which only the application server and port settings are written and everything others like middleware and routing is defined in ./app.js file.
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Finding quaternion representing the rotation from one vector to another
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Quaternion q;
vector a = crossproduct(v1, v2);
q.xyz = a;
q.w = sqrt((v1.Length ^ 2) * (v2.Length ^ 2)) + dotproduct(v1, v2);
Don't forget to normalize q.
Richard is right about there not being a unique rotation, but the above should give the "shortest arc," which is pro...