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opengl: glFlush() vs. glFinish()
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Mind that these commands exist since the early days of OpenGL. glFlush ensures that previous OpenGL commands must complete in finite time (OpenGL 2.1 specs, page 245). If you draw directly to the front buffer, this shall ensure that the Open...
Animate change of view controllers without using navigation controller stack, subviews or modal cont
...lass I called TransitionController. You can find it at https://gist.github.com/1394947.
As an aside, I prefer the implementation in a separate class b/c it's easier to reuse. If you don't want that, you could simply implement the same logic directly in your app delegate eliminating the need for the...
What is ViewModel in MVC?
...ct.
A view model might not only have data from one database table. It can combine data from another table. Take my example above about adding a new employee record. Besides adding just the first and last names you might also want to add the department of the employee. This list of departments will ...
Javascript reduce on array of objects
...((a, b) => ({x: a.x + b.x}));
// -> {x: 7}
Explanation added from comments:
The return value of each iteration of [].reduce used as the a variable in the next iteration.
Iteration 1: a = {x:1}, b = {x:2}, {x: 3} assigned to a in Iteration 2
Iteration 2: a = {x:3}, b = {x:4}.
The probl...
Why is creating a new process more expensive on Windows than Linux?
...al overhead imposed by parsing manifests, checking if the image requires a compatbility shim, checking whether software restriction policies apply, yada yada.
That said, I see the overall slowdown in the sum of all those little things that have to be done in addition to the raw creation of a proces...
How to extract the decision rules from scikit-learn decision-tree?
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I agree with the previous comment. IIUC, print "{}return {}".format(indent, tree_.value[node]) should be changed to print "{}return {}".format(indent, np.argmax(tree_.value[node][0])) for the function to return the class index.
–...
JOIN queries vs multiple queries
... edited Jun 24 '11 at 20:28
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answered Jul 1 '09 at 2:27
Paolo BergantinoPaolo...
How do I create an HTML table with a fixed/frozen left column and a scrollable body?
...p-width: 1px;
/*only relevant for first row*/
margin-top: -1px;
/*compensate for top border*/
}
.headcol:before {
content: 'Row ';
}
.long {
background: yellow;
letter-spacing: 1em;
}
<div>
<table>
<tr><th class="headcol">1</th><...
How to call asynchronous method from synchronous method in C#?
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Asynchronous programming does "grow" through the code base. It has been compared to a zombie virus. The best solution is to allow it to grow, but sometimes that's not possible.
I have written a few types in my Nito.AsyncEx library for dealing with a partially-asynchronous code base. There's no so...
How to concatenate two MP4 files using FFmpeg?
...uts).
ffmpeg -i opening.mkv -i episode.mkv -i ending.mkv \
-filter_complex "[0:v] [0:a] [1:v] [1:a] [2:v] [2:a]
concat=n=3:v=1:a=1 [v] [a]" \
-map "[v]" -map "[a]" output.mkv
Note that this method performs a re-encode.
2. concat demuxer
Use this method whe...