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App Inventor 2 向心力实验App - 探究向心力F与角速度ω、半径r、质量m的关...
...扰
3. 手机固定：务必牢固固定手机，防止飞出
4. 安全提示：建议使用远程控制功能，实验时远离旋转装置
5. 精度限制：手机传感器精度有限，适用于教学演示，不替代专业实验设备
参考资料
- phyphox 官网
- phyphox 离心加...
【软著】软件著作权证书申请流程及注意事项，模板分享 - App Inventor 2 中...
...表一个事件、一个函数、一个条件判断等。
块的布局和连接：除了保存块本身的代码逻辑，.blk 文件还记录了这些块如何在界面上布局和连接，确保应用逻辑在界面中正确呈现和执行。
.blk 文件的特点：
图形化编程的底层表...
Using sed and grep/egrep to search and replace
...tand why though since it makes sense... the -l part of xargs was giving me errors so I took it out, could that be related?
– Ori
Jul 23 '09 at 6:43
...
Difference between sh and bash
...to),
#!/bin/bash
will use /bin/bash if it's available (and fail with an error message if it's not). Of course, you can also specify another implementation, e.g.
#!/bin/dash
Which one to use
For my own scripts, I prefer sh for the following reasons:
it is standardized
it is much simpler and ...
get just the integer from wc in bash
...
What if I'm piping with with find? I get an error: find . -path -prune -o -name "*.swift" -print0 | xargs -0 wc -l works ok but prints every file. If I use find . -path -prune -o -name "*.swift" -print0 | xargs -0 wc -l < I get an error. parse error near '\n'
...
How to assert greater than using JUnit Assert?
... greaterThan(Long.parseLong(currentTokenValues[1])));
That gives an error like:
java.lang.AssertionError: timestamp
Expected: a value greater than <456L>
but: <123L> was less than <456L>
share...
source command not found in sh shell
I have a script that uses sh shell. I get an error in the line that uses the source command. It seems source is not included in my sh shell.
...
Are lists thread-safe?
...s but keep the numbers big enough and run a few times and you will see the error
The FLAWED version
import threading
import time
# Change this number as you please, bigger numbers will get the error quickly
count = 1000
l = []
def add():
for i in range(count):
l.append(i)
tim...
How to convert wstring into string?
...is is deprecated (stackoverflow.com/a/42946556/211176). My compiler throws errors when I try to run this code
– adam_0
Feb 14 '18 at 19:53
6
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How to force LINQ Sum() to return 0 while source collection is empty
...
I got error when I try without ToList(), since it returns nothing. But the ToList() will make the empty list and it is not giving any error when I do ToList().Sum().
– Mona
Aug 4 '16 at 10:38
...