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分享几个App Inventor 2“隐藏”的非常的实用的小技巧 - App Inventor 2 中...
...1Xj41147cn/
4、代码块导出图像，以及还原：https://www.fun123.cn/reference/other/download-pngs.html
5、iOS界面外观
6、过程参数，鼠标悬停时，可直接拖动获取和设置的代码块；参数可变：https://www.fun123.cn/reference/concepts/mutators.html...
2024 全“心”出发 -- 全新App Inventor 2 移动社区开启新征程 - App Inven...
...努力！
为什么使用两个独立的域名：bbs.tsingfun.com 和 fun123.cn？
fun123.cn 作为纯粹的App Inventor 2 中文编程平台，及中文文档教程平台；bbs.tsingfun.com作为社区及App Inventor 2之外技术的讨论，看起来独立，实际则是可以融为一体的。...
Appinventor的人工智能组件在哪里？ - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...个是AI绘图。
更多指导，请查看中文文档：https://www.fun123.cn/reference/ ... mental.html#ChatBot
另外，除了调用ChatGPT外，还有很多拓展可以自行训练AI数据集，自行实现AI功能，
详见：[hide]https://www.fun123.cn/reference/extensions/[/hide]
...
BLE 接收BLE模块发来的信息 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...-1.html
读取ble数据并显示在App上请参考文档：https://www.fun123.cn/reference/ ... ml#RegisterForBytes
请先自行研究一下，如果遇到具体的问题，请再继续跟帖提问，谢谢。App Inventor 2  发表于 2024-09-24 16:15
ble 设备连接，发送数据...
如何实现设置用户头像功能呢？ - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...面的组件可以实现，具体用法参考中文文档：https://www.fun123.cn/reference/components/media.html
App Inventor 2  发表于 2024-11-17 18:58
多媒体下面的组件可以实现，具体用法参考中文文档：https://www.fun123.cn/reference/components/media.h ...
这...
GestureDetector 手势检测拓展：识别向上/向下/向右/向左滑动和双击等手势...
...mmunity.kodular.io/t/f ... d-doubleclick/94542
已整理：https://www.fun123.cn/reference/ ... /gesturedetect.htmlhttps://www.fun123.cn/reference/other/extensionsMultitouch.html
https://www.fun123.cn/reference/other/extensionsRotation.html
待一起分析、整理。
ElasticSearch, Sphinx, Lucene, Solr, Xapian. Which fits for which usage? [closed]
...t;";
exit("done");
?>
Sample result:
[array] =>
"id" => 123,
"title" => "My post title.",
"content" => "My <p>post</p> content.",
...
[ and other fields ]
Sphinx query time:
0.001 sec.
Sphinx query time (1k concurrent):
=> 0.346 sec. (average)
...
C# short/long/int literal format?
...by F or f is of type float. For example, the literals 1f, 1.5f, 1e10f, and 123.456F are all of type float.
A real literal suffixed by D or d is of type double. For example, the literals 1d, 1.5d, 1e10d, and 123.456D are all of type double.
A real literal suffixed by M or m is of type decimal. For ex...
Remove duplicated rows using dplyr
...ction for this purpose.
Original answer below:
library(dplyr)
set.seed(123)
df <- data.frame(
x = sample(0:1, 10, replace = T),
y = sample(0:1, 10, replace = T),
z = 1:10
)
One approach would be to group, and then only keep the first row:
df %>% group_by(x, y) %>% filter(row_nu...
Checking if a string can be converted to float in Python
... ------------
print(isfloat("")) False
print(isfloat("1234567")) True
print(isfloat("NaN")) True nan is also float
print(isfloat("NaNananana BATMAN")) False
print(isfloat("123.456")) True
print(isfloat("123.E4")) ...