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Undefined symbols for architecture armv7
... header and do not link against the correct library. This is common, especially for headers for libraries like QuartzCore since it is not included in projects by default. To resolve:
Add the correct libraries in the Link Binary With Libraries section of the Build Phases.
If you want to add a libra...
“implements Runnable” vs “extends Thread” in Java
...
Yes: implements Runnable is the preferred way to do it, IMO. You're not really specialising the thread's behaviour. You're just giving it something to run. That means composition is the philosophically "purer" way to go.
In practical terms, it means you can implement Runnable and extend from anot...
Looking for a good world map generation algorithm [closed]
... and modify your second idea. Once you generate your continents (which are all about the same size), get them to randomly move and rotate and collide and deform each other and drift apart from each other. (Note: this may not be the easiest thing ever to implement.)
Edit: Here's another way of doing...
HC-05/BLE 蓝牙通信数据乱码？接收到的中文乱码？乱码的原理及解决思路 · ...
...？
解决方法：
串口工具默认是GBK编码，非UTF-8的，如“你好”对应16进制：C4 E3 BA C3。而App Inventor 2的中文字符串默认是UTF-8编码的（E4 BD A0 E5 A5 BD ）。
将App Inventor 2的蓝牙客户端组件的编码改为GBK即可。
当然，将...
App Inventor 2 TaifunBattery 电池管理器拓展：获取电量、电池健康状态、...
... App Inventor 2 TaifunBattery 电池管理器拓展：获取电量、电池健康状态、电池剩余容量等
TaifunBattery 电池管理器拓展
属性
事件
示例App: 电池...
App Inventor 2 社区精华问答 · App Inventor 2 中文网
...题解决
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社区精华问答：整理自 bbs.tsingfun.com 社区的优质帖子，一帖一文，涵盖 App Inventor 2 开发中的基础知识、组件用法、技巧分享与常见错误解决。原帖链接见各文末。
基础知识
【科普...
Get column index from column name in python pandas
In R when you need to retrieve a column index based on the name of the column you could do
7 Answers
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When to wrap quotes around a shell variable?
... quote it if it can either be empty or contain spaces (or any whitespace really) or special characters (wildcards). Not quoting strings with spaces often leads to the shell breaking apart a single argument into many.
$? doesn't need quotes since it's a numeric value. Whether $URL needs it depends o...
How to use font-awesome icons from node-modules
I have installed font-awesome 4.0.3 icons using npm install .
10 Answers
10
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append multiple values for one key in a dictionary [duplicate]
...st of values associated with that year, right? Here's how I'd do it:
years_dict = dict()
for line in list:
if line[0] in years_dict:
# append the new number to the existing array at this slot
years_dict[line[0]].append(line[1])
else:
# create a new array in this slo...