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How do I compute derivative using Numpy?
...uld be something like
x = 5.0
eps = numpy.sqrt(numpy.finfo(float).eps) * (1.0 + x)
print (p(x + eps) - p(x - eps)) / (2.0 * eps * x)
if you have an array x of abscissae with a corresponding array y of function values, you can comput approximations of derivatives with
numpy.diff(y) / numpy.diff(x...
Throttling method calls to M requests in N seconds
...w one request per second
private RateLimiter throttle = RateLimiter.create(1.0);
private void someMethod() {
throttle.acquire();
// Do something
}
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How can I get Express to output nicely formatted HTML?
... you s.th. like:
output.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html><head><title>My Title</title><link rel="stylesheet" href="/stylesheets/style.css"/><script type="text/j...
Modify tick label text
...a boxplot), this will not work with any version of matplotlib newer than 1.1.0. If you're working from the current github master, this won't work. I'm not sure what the problem is yet... It may be an unintended change, or it may not be...
Normally, you'd do something along these lines:
import m...
How to express infinity in Ruby?
...uby 1.8.6, 1.8.7, and 1.9.2 you have Float.infinite?.
PositiveInfinity = +1.0/0.0
=> Infinity
NegativeInfinity = -1.0/0.0
=> -Infinity
CompleteInfinity = NegativeInfinity..PositiveInfinity
=> -Infinity..Infinity
*I've verified this in Ruby 1.8.6 and 1.9.2
...
WebSockets protocol vs HTTP
... order transport layer. No browser support (except via plugin/Flash).
HTTP 1.0: request-response transport protocol layered on TCP. The client makes one full request, the server gives one full response, and then the connection is closed. The request methods (GET, POST, HEAD) have specific transactio...
How do I create a simple 'Hello World' module in Magento?
...ore/app
touch etc/modules/MyCompanyName_HelloWorld.xml
<?xml version="1.0"?>
<config>
<modules>
<MyCompanyName_HelloWorld>
<active>true</active>
<codePool>local</codePool>
</MyCompanyName_HelloWorld>...
How to change spinner text size and text color?
...ve your customized color and size to text in this file.
<?xml version="1.0" encoding="utf-8"?>
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
andro...
Importing a Maven project into Eclipse from Git
...
Eclipse Indigo + M2Eclipse 1.0 makes it very easy.
If you don't already have the Git connector for M2Eclipse install it. M2Eclipse will help you along by prompting you on the Import menu.
Select the "Import..." context menu from the Package Expl...
A clean, lightweight alternative to Python's twisted? [closed]
...ue and Event to work with.
It only supports libevent (update: libev since 1.0) as reactor implementation but takes full advantage of it, featuring a fast WSGI server based on libevent-http and resolving DNS queries through libevent-dns as opposed to using a thread pool like most other libraries do....