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What is the use of ObservableCollection in .net?
...ed,
INotifyPropertyChanged
As such it is very useful when you want to know when the collection has changed. An event is triggered that will tell the user what entries have been added/removed or moved.
More importantly they are very useful when using databinding on a form.
...
arrayfun can be significantly slower than an explicit loop in matlab. Why?
...n2 10.392475 seconds.
Soln3 0.239023 seconds.
Oli 0.010672 seconds.
Now, while the fully 'vectorized' solution is clearly the fastest, you can see that defining a function to be called for every x entry is a huge overhead. Just explicitly writing out the computation got us factor 5 speedup. I...
How to Implement Custom Table View Section Headers and Footers with Storyboard
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I know this question was for iOS 5, but for the benefit of future readers, note that effective iOS 6 we can now use dequeueReusableHeaderFooterViewWithIdentifier instead of dequeueReusableCellWithIdentifier.
So in viewDidLoad, ...
jQuery Validate - Enable validation for hidden fields
...ge should make the setup of forms with hidden elements
easier, these are now ignored by default (option “ignore” has
“:hidden” now as default). In theory, this could break an existing
setup. In the unlikely case that it actually does, you can fix it by
setting the ignore-option to ...
Is there a quicker / better way to clear the iPhone Simulator cache than deleting its directory?
...o the Keyboard Shortcut:. (I use command-period)
Click the Add button.
Now, while in your iOS Simulator, you can simply use your new shortcut key to reset.
If the Simulator doesn't appear in the drop down list:
In a Finder window, go to your Applications folder.
Right-click Xcode and choose...
Where can I find Android source code online? [closed]
...up android. Some of the projects (such as Kernel) have been removed and it now only points you to clonable git repositories.
To get all the code locally, you can use the repo helper program, or you can just clone individual repositories.
And others:
Downloading the Source Tree
...
How to implement common bash idioms in Python? [closed]
...I just discovered how to combine the best parts of bash and ipython. Up to now this seems more comfortable to me than using subprocess and so on. You can easily copy big parts of existing bash scripts and e.g. add error handling in the python way :)
And here is my result:
#!/usr/bin/env ipython3
#...
Differences between distribute, distutils, setuptools and distutils2?
...distutils2.
Recommendation:
If all of this is new to you, and you don't know where to start, I would recommend learning setuptools, along with pip and virtualenv, which all work very well together.
If you're looking into virtualenv, you might be interested in this question: What is the difference...
foreach vs someList.ForEach(){}
.... e.g. a block of code for reading rows from a dataReader.
I still don't know exactly why they did this.
The drawbacks of list.ForEach() are:
It is more verbose in C# 2.0. However, in C# 3 onwards, you can use the "=>" syntax to make some nicely terse expressions.
It is less familiar. People ...
Handling file renames in git
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In git 1.9.1 git status now behaves like git commit.
– Jacques René Mesrine
Oct 5 '15 at 16:11
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