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Learn C first before learning Objective-C [closed]
...does typically assume familiarity with C, so starting with The Objective-C 2.0 Programming Language won't be of much benefit to you. I would invest in a copy of Programming in Objective-C by Stephen Kochan (depending on how quickly you want to get underway, you may consider waiting for the second ed...
Shortest distance between a point and a line segment
... 2.8284271247461903 (incorrect). distAnother(0., 0., 4., 0., 2., 2.) gives 2.0 (correct). Please be aware of this. I think the code can be improved to have float conversion somewhere.
– Vladimir Obrizan
Feb 3 '13 at 21:20
...
Change column type from string to float in Pandas
...d argument:
>>> pd.to_numeric(s, errors='coerce')
0 1.0
1 2.0
2 4.7
3 NaN
4 10.0
dtype: float64
The third option for errors is just to ignore the operation if an invalid value is encountered:
>>> pd.to_numeric(s, errors='ignore')
# the original Series is returne...
What’s the best way to reload / refresh an iframe?
...
absolute it's work, but stuck with same domain origin policy ==a
– Bobby Stenly
Mar 19 '13 at 6:32
6
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When to use , tag files, composite components and/or custom components?
I started using JSF 2.0 with Facelets recently and got puzzled by new composite components knowing existing <ui:include> and other templating techniques offered by Facelets 1.x.
...
How do I discover memory usage of my application in Android?
...w memory is managed on Android:
Service API changes starting with Android 2.0
Now ActivityManager.getMemoryInfo() is our highest-level API for looking at overall memory usage. This is mostly there to help an application gauge how close the system is coming to having no more memory for background ...
Camera 扩展：相机拍照和录像，程序控制拍照、自动拍照实现，而无需点击系...
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Why Choose Struct Over Class?
...ft Compiler setting is -O -whole-module-optimization:
class version took 2.06 seconds
struct version took 4.17e-08 seconds (50,000,000 times faster)
(I no longer average multiple runs, as variances are very small, under 5%)
Note: the difference is a lot less dramatic without whole module optimi...
RadioButton单选按钮扩展集合 · App Inventor 2 中文网
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What is the bower (and npm) version syntax?
...take any subsequent patch-level changes on the 1.2.x tree, starting with 1.2.0, but less than 1.3.0, you could use:
"angular": "~1.2"
or:
"angular": "~1.2.0"
This also gets you the same results as using the .x syntax:
"angular": "1.2.x"
But, you can use the tilde/~ syntax to be even more sp...