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AppInventor2能画数据波形图吗？ - App应用开发 - 清泛IT社区，为创新赋能！
请叫学长:
Q：数据波形图可以吗 就通过单片机上发的数据 实时更新显示波形
类似这种，实时更新上传的数据为波形
A：图表组件可以画出这种图
Q：响应的速度 ms级别能跟上吗
A：这个倒是没有测试过。mark...
AppInventor2 如何自定义包名？ - App应用开发 - 清泛IT社区，为创新赋能！
AppInventor2 如何自定义包名？
Q: 如何自定义包名？编译后下载的APK的包名一大堆乱七八糟的？
A: 编译菜单，编译参数设置：
Q: 有没什么特殊项命名要求？后面需要加什么.cn，.com之类的字符？
A: 至少要有一个英文...
'Contains()' workaround using Linq to Entities?
...sion.Lambda<Func<TEntity, bool>>(body, p));
}
//Optional - to allow static collection:
public static IQueryable<TEntity> WhereIn<TEntity, TValue>
(
this ObjectQuery<TEntity> query,
Expression<Func<TEntity, TValue>> selector,
params TValue[] co...
Using sections in Editor/Display templates
I want to keep all of my JavaScript code in one section; just before the closing body tag in my master layout page and just wondering the best to go about it, MVC style.
...
How do I use a file grep comparison inside a bash if/else statement?
...tus is 0 if any line was selected, 1 otherwise;
if any error occurs and -q was not given, the exit status is 2.
if grep --quiet MYSQL_ROLE=master /etc/aws/hosts.conf; then
echo exists
else
echo not found
fi
You may want to use a more specific regex, such as ^MYSQL_ROLE=master$, to avoid th...
How to select from subquery using Laravel Query Builder?
...y there is no method to create subquery in FROM clause, so you need to manually use raw statement, then, if necessary, you will merge all the bindings:
$sub = Abc::where(..)->groupBy(..); // Eloquent Builder instance
$count = DB::table( DB::raw("({$sub->toSql()}) as sub") )
->mergeBin...
Reading value from console, interactively
...locking on input, something node.js doesn't like to do.
Instead set up a callback to be called each time something is entered:
var stdin = process.openStdin();
stdin.addListener("data", function(d) {
// note: d is an object, and when converted to a string it will
// end with a linefeed. ...
What is the difference between static_cast and C style casting?
...runtime.
Also, c++ style casts can be searched for easily, whereas it's really hard to search for c style casts.
Another big benefit is that the 4 different C++ style casts express the intent of the programmer more clearly.
When writing C++ I'd pretty much always use the C++ ones over the the C...
Insert a line at specific line number with sed or awk
...
mac users: with homebrew, brew install gnu-sed and then use this with gsed
– cwd
Jan 10 '15 at 17:58
4
...
Programmatically access currency exchange rates [closed]
... this, is there any information on what the parameters stand for? Specifically the "f" parameter. I can't find any info anywhere.
– Fishcake
Oct 8 '09 at 6:12
9
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