大约有 4,000 项符合查询结果（耗时：0.0129秒） [XML]
How to sum a variable by group
...
Using aggregate:
aggregate(x$Frequency, by=list(Category=x$Category), FUN=sum)
Category x
1 First 30
2 Second 5
3 Third 34
In the example above, multiple dimensions can be specified in the list. Multiple aggregated metrics of the same data type can be incorporated via cbind:
ag...
How can I change the language (to english) in Oracle SQL Developer?
... this option will be:
oracle.translated.locales = de,es,it,ja,ko,pt_BR,zh_CN,zh_TW
The original value was:
oracle.translated.locales = de,fr,es,it,ja,ko,pt_BR,zh_CN,zh_TW
The configuration above (sqldeveloper.conf file) will be wrong after remove french support and the french language does not...
How does the “this” keyword work?
...t("I'm evaluated in the initial global execution context!");
setTimeout(function () {
alert("I'm NOT evaluated in the initial global execution context.");
}, 1);
</script>
When evaluating code in the initial global execution context, ThisBinding is set to the global object, window ...
How to run a process with a timeout in Bash? [duplicate]
...ld be missing from anything that is FreeBSD, NetBSD, OS X, HP/UX, Solaris, AIX, etc.
– Graham
Apr 19 '12 at 22:32
3
...
How to preserve insertion order in HashMap? [duplicate]
...tee that the order will remain constant over time.
Perhaps you can do as aix suggests and use a LinkedHashMap, or another ordered collection. This link can help you find the most appropriate collection to use.
share
...
Detecting Windows or Linux? [duplicate]
...{
return (OS.contains("nix") || OS.contains("nux") || OS.contains("aix"));
}
public static boolean isSolaris() {
return OS.contains("sunos");
}
public static String getOS(){
if (isWindows()) {
return "win";
} else if (isMac()) {
...
MenuSlide 拓展：滑动菜单效果 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
代码如下：
拓展.aix下载：
原文：https://community.kodular.io/t/m ... ar-extension/209153
SideBarV2 侧边栏拓展 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
...鼎的 MaterialDesign 库，上传.ttf 字体文件并指定即可。
.aix拓展下载：
也有其他替代方案：
https://ullisroboterseite.de/android-AI2-SideBar.html
https://ullisroboterseite.de/android-AI2-SideBar2.html
参考：https://mp.weixin.qq.com/s/gEaEO4BKOfPD8Xtz...
Flubbie 为App添加魔法动画的拓展 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
.aix拓展下载：
原文：https://community.appinventor.mi ... ur-components/38796
TaifunFlashlight 手电筒/闪光灯拓展 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
...光灯
过程
打开闪光灯
关闭闪光灯
示例程序
.aix 下载：
为什么条码扫描器开始工作时，通过taifunflashlight打开的手电筒就自动关闭了，能否在条码扫描器工作的同时手电筒也能同时工作？这样在黑暗的地方扫码...