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What's the opposite of chr() in Ruby?
... 1.9.x - 2.1.x portable replacements:
[22] pry(main)> "\u0221".ord.chr
RangeError: 545 out of char range
from (pry):2:in 'chr'
[23] pry(main)> x = "\u0221".unpack('U')[0]
=> 545
[24] pry(main)> [x].pack('U')
=> "ȡ"
[25] pry(main)>
...
What is “Argument-Dependent Lookup” (aka ADL, or “Koenig Lookup”)?
...unfortunate behavior.
ADL is responsible for a major overhaul of the for-range loop in C++11. To understand why ADL can sometimes have unintended effects, consider that not only the namespaces where the arguments are defined are considered, but also the arguments of template arguments of the argum...
What is in your Mathematica tool bag? [closed]
...the z-axis
In[2] := rots = RotationTransform[#, {0, 0, 1}] & /@ (Pi/2 Range[0, 3]);
Using SelectEquivalents we can group the points that produce the same set of images under these operations, i.e. they're equivalent, using the following
In[3] := SelectEquivalents[ pts, Union[Through[rots[#] ...
How can I get a count of the total number of digits in a number?
...
If your number range includes negatives, you'll need to use Math.Floor(Math.Log10(Math.Abs(n)) + 1);
– mrcrowl
Jun 6 '12 at 3:35
...
Parse rfc3339 date strings in Python? [duplicate]
...since it requires the caller to provide format strings for the rather wide range of ISO 8601 variants (unless one likes ValueError if the seconds are omitted, e.g). The dateutil parser, on the other hand, handles these much better.
– Alex North-Keys
Apr 25 '17...
Caveats of select/poll vs. epoll reactors in Twisted
...you can't even use select() if you have file descriptor values in the 10k+ range - unless you recompile half your system to change FD_SETSIZE - so I wonder how this strategy worked at all. For the scenario you described, I'd probably look at poll() which is much more like select() than it is like e...
What are the typical reasons Javascript developed on Firefox fails on IE? [closed]
...vt.clientX+scrollpos[0], evt.clientY+scrollpos[1]];
};
};
Selections/ranges:
<textarea> and <input> selections: selectionStart and selectionEnd are not implemented in IE, and there's a proprietary "ranges" system in its place, see also Caret position in textarea, in characters fr...
How to initialize a vector in C++ [duplicate]
...t page, actually. The constructor can take the first and last element in a range and create a vector with everything in between. The tipoff is the & will result in memory addresses.
– Prashant Kumar
Jun 23 '13 at 13:43
...
Quickly find whether a value is present in a C array?
... need to find a hash function that maps your input value to a value in the range 0..n, where there are no collisions for all the valid values you care about. That is, no two "valid" values hash to the same output value. When searching for a good hash function, you aim to:
Keep the hash function rea...
将 App Inventor 2 项目连接到外部传感器 · App Inventor 2 中文网
...able microcontroller and can provide input/output functionality for a wide range of applications. By building out IOIO/MOIO board support for AppInventor, creating a robotics kit and accompanying tutorials, we hope to make hardware programming more accessible.
The Kit
For sensors, the kit includes ...