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How do I compute derivative using Numpy?
...qrt(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)
...
How do you enable “Enable .NET Framework source stepping”?
...
In my case, I was debugging an old .NET 2.0 WinForms application and I got the "Source Not Available" message. I tried all the recommended settings.
Ultimately, I rebuilt the app to temporarily target .NET 4.5 and was able to get the source stepping to work. Perha...
Modify tick label text
...ext() for item in axes.get_xticklabels()]
['0.0', 'change', '1.0', '1.5', '2.0']
It works in the versions from 1.1.1rc1 to the current version 2.0.
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decorators in the python standard lib (@deprecated specifically)
...port deprecation
@deprecation.deprecated(deprecated_in="1.0", removed_in="2.0",
current_version=__version__,
details="Use the bar function instead")
def foo():
"""Do some stuff"""
return 1
See http://deprecation.readthedocs.io/ for the full ...
Python Requests throwing SSLError
...(which you should obtain by some sort of secure means).
So, as of version 2.0, the verify parameter accepts the following values, with their respective semantics:
True: causes the certificate to validated against the library's own trusted certificate authorities (Note: you can see which Root Cert...
How to check if hex color is “too black”?
...olor, from 0-1 as defined by Web Content Accessibility Guidelines (Version 2.0).
tinycolor("#fff").getLuminance(); // 1
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Precise Financial Calculation in JavaScript. What Are the Gotchas?
...tead of 25.50 dollars.
Consider that in JavaScript:
var result = 1.0 + 2.0; // (result === 3.0) returns true
But:
var result = 0.1 + 0.2; // (result === 0.3) returns false
The expression 0.1 + 0.2 === 0.3 returns false, but fortunately integer arithmetic in floating-point is exact, ...
Mongo: find items that don't have a certain field
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@Theo: Starting from MongoDB 2.0 $exists is able to use indexes (jira.mongodb.org/browse/SERVER-393)
– Dmitry Schetnikovich
Nov 23 '11 at 15:48
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Returning a value from thread?
... on how do you want to create the thread and available .NET version:
.NET 2.0+:
A) You can create the Thread object directly. In this case you could use "closure" - declare variable and capture it using lambda-expression:
object result = null;
Thread thread = new System.Threading.Thread(() => ...
Change string color with NSAttributedString?
...et paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 2.0
// Note: UIFont(appFontFamily:ofSize:) is extended init.
let regularAttributes: [NSAttributedString.Key : Any] = [.font : UIFont(appFontFamily: .regular, ofSize: 15)!, .paragraphStyle : paragraphStyle]
let boldAttrib...