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“列表显示框”中的列表选项点不动？ - App Inventor 2 中文网 - 清泛IT社...
...：
BLE设备列表显示在“列表显示框”中，测试时列表中的选项点不动？
建议可以先用排除法：新建一个项目，列表显示框加几个测试项，看能否点的动。
新项目手机点不动的话，换模拟器试试。便于找到导致这个问题的...
如何实现心电图曲线 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...ng 于 2024-06-21 17:03 编辑
我想做一个采集数据，显示曲线的app，类似下图显示心电图和心率这样的曲线，请问需要用什么控件实现，如果实现多条曲线又该怎么办？
简单的图表使用原生组件可以实现：
有五种不同的图表类型...
有没有关于CRC校验的扩展？ - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
...进行二进制运算功能有限，可不可以开发一个进行CRC校验的扩展，这样做工业网络控制就简单得多。这个需求比较通用，应该是有现成的 CRC 拓展，我稍后找一下再上传{:8_384:}参考：https://community.appinventor.mit.edu/t/can-someone-help-me-r...
clang: how to list supported target architectures?
...t;vendor>-<sys>-<abi>, where:
arch = x86, arm, thumb, mips, etc.
sub = for ex. on ARM: v5, v6m, v7a, v7m, etc.
vendor = pc, apple, nvidia, ibm, etc.
sys = none, linux, win32, darwin, cuda, etc.
abi = eabi, gnu, android, macho, elf, etc.
and you can even fine tune specify a target cp...
Why is nginx responding to any domain name?
...me domain_1;
[...]
}
server {
server_name domain_2;
[...]
}
etc
** EDIT **
It seems some users are a bit confused by this example and think it is limited to a single conf file etc.
Please note that the above is a simple example for the OP to develop as required.
I personally use ...
How to permanently set $PATH on Linux/Unix? [closed]
...st use a specific shell syntax and export or set commands.
System wide
/etc/environment List of unique assignments, allows references. Perfect for adding system-wide directories like /usr/local/something/bin to PATH variable or defining JAVA_HOME. Used by PAM and SystemD.
/etc/environment.d/*.co...
计算统计特征（正态分布）函数及实例 - C/C++ - 清泛网 - 专注C/C++及内核技术
...AX_VAR;
double _ave;
//double _var;
double _sam_stdev;
double _all_stdev;
double _sum;
double _sum_2;
int _count;
double _min_v;
double _max_v;
StdevInfo()
: _ave(0.0)
//, _var(MAX_VAR)
, _sam_stdev(sqrt(MAX_VAR))
, _all_stdev(0.0)
, _sum(0.0)
...
How to implement a rule engine?
... right);
}
}
Note that I used 'GreaterThan' instead of 'greater_than' etc. - this is because 'GreaterThan' is the .NET name for the operator, therefore we don't need any extra mapping.
If you need custom names you can build a very simple dictionary and just translate all operators before compil...
No ConcurrentList in .Net 4.0?
...Add and provide random read-only access by index (but no Insert, RemoveAt, etc., and also no random write access).
This was the goal of my ConcurrentList<T> implementation. But when I tested its performance in multithreaded scenarios, I found that simply synchronizing adds to a List<T> ...
How to include package data with setuptools/distribute?
... ('bitmaps', ['bm/b1.gif', 'bm/b2.gif']),
('/opt/local/myproject/etc', ['myproject/config/settings.py', 'myproject/config/other_settings.special']),
('/opt/local/myproject/etc', [os.path.join('myproject/config', 'cool.huh')]),
#
('/opt/local/myproject/etc', [os.path.join('m...