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How to generate a random integer number from within a range
...
All the answers so far are mathematically wrong. Returning rand() % N does not uniformly give a number in the range [0, N) unless N divides the length of the interval into which rand() returns (i.e. is a power of 2). Furthermore, one has no idea whether the moduli of rand() are independent: it...
How do you execute an arbitrary native command from a string?
...Prefer the full names of the PowerShell functions.
– Doug Finke
Jun 14 '11 at 1:17
1
@Doug: Most ...
Mac OS X - EnvironmentError: mysql_config not found
...ld actually be called 'mysql_config5', and in this case, you would have to do this after installing: export PATH=$PATH:/opt/local/lib/mysql5/bin. You can find more details here.
Note1: I've seen some people saying that installing python-dev and libmysqlclient-dev also helped, however I do not know...
Context switches much slower in new linux kernels
...ion to the bad thread wake up performance problem in recent kernels has to do with the switch to the intel_idle cpuidle driver from acpi_idle, the driver used in older kernels. Sadly, the intel_idle driver ignores the user's BIOS configuration for the C-states and dances to its own tune. In other wo...
Is there a WebSocket client implemented for Python? [closed]
...tp://pypi.python.org/pypi/websocket-client/
Ridiculously easy to use.
sudo pip install websocket-client
Sample client code:
#!/usr/bin/python
from websocket import create_connection
ws = create_connection("ws://localhost:8080/websocket")
print "Sending 'Hello, World'..."
ws.send("Hello, World...
Using the HTML5 “required” attribute for a group of checkboxes?
... is clicked;
the browsers detects that the "required" field is empty and does not submit the form; instead browser shows a hint asking the user to type text into the field.
...
When to use next() and return next() in Node.js
... to ensure that the execution stops after triggering the callback.
If you don't do it, you risk triggering the callback a second time later, which usually has devastating results. Your code is fine as it is, but I would rewrite it as:
app.get('/users/:id?', function(req, res, next){
var id = r...
Uninstall all installed gems, in OSX?
...cludes executables
Rubgems < 2.1.0
for i in `gem list --no-versions`; do gem uninstall -aIx $i; done
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How can I generate an MD5 hash?
... get a MD5 instance of MessageDigest you can use.
The compute the hash by doing one of:
Feed the entire input as a byte[] and calculate the hash in one operation with md.digest(bytes).
Feed the MessageDigest one byte[] chunk at a time by calling md.update(bytes). When you're done adding input byt...
In C#, how do I calculate someone's age based on a DateTime type birthday?
... Just wanted to comment on DateTime.Now performance. If you don't need an accurate time zone value, use DateTime.UtcNow it's much faster.
– JAG
Jan 22 '09 at 10:29
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