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Subtract two variables in Bash
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225
You just need a little extra whitespace around the minus sign, and backticks:
COUNT=`expr $FIRS...
NumPy or Pandas: Keeping array type as integer while having a NaN value
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techvslifetechvslife
1,6231515 silver badges2020 bronze badges
1
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一分钟读懂低功耗蓝牙(BLE) MTU交换数据包 - 创客硬件开发 - 清泛IT社区，...
...一个较小的值作为以后的MTU，比如说，主设备发出一个150个字节的MTU请求，但是从设备回应MTU是23字节，那么今后双方要以较小的值23字节作为以后的MTU），主从双方约定每次在做数据传输时不超过这个最大数据单元。
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Why doesn't String switch statement support a null case?
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145
As damryfbfnetsi points out in the comments, JLS §14.11 has the following note:
The prohibitio...
How to handle back button in activity
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You can handle it like this:
for API level 5 and greater
@Override
public void onBackPressed() {
// your code.
}
older than API 5
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
// your code...
Create a GUID in Java
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355
Have a look at the UUID class bundled with Java 5 and later.
For example:
If you want a ran...
Eliminate extra separators below UITableView
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1524
Interface builder (iOS 9+)
Just drag a UIView to the table. In storyboard, it will sit at th...
How can I set the value of a DropDownList using jQuery?
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605
$("#mydropdownlist").val("thevalue");
just make sure the value in the options tags matches the...
How to Update Multiple Array Elements in mongodb
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15 Answers
15
Active
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Hadoop “Unable to load native-hadoop library for your platform” warning
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answered Nov 15 '13 at 4:12
zhutoulalazhutoulala
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