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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...
...速度 a
2. 陀螺仪（GyroscopeSensor）— 实时测量角速度 ω
3. 用户输入质量 m（可模拟不同质量物体）
4. 用户输入半径 r（可设置不同旋转半径）
5. 自动计算 F = m · r · ω²
6. 实时绘制 F-ω、F-r、F-m 关系曲线
7. 叠加理论曲线对比...
JUnit 4 compare Sets
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edited Feb 19 '19 at 14:13
Neuron
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answered Feb ...
Formula to determine brightness of RGB color
... → sqrt( 0.299*R^2 + 0.587*G^2 + 0.114*B^2 ) (thanks to @MatthewHerbst) [3]
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How to append rows to an R data frame
..., and then, at the end, create your data.frame.
Continuing with Julian's f3 (a preallocated data.frame) as the fastest option so far, defined as:
# pre-allocate space
f3 <- function(n){
df <- data.frame(x = numeric(n), y = character(n), stringsAsFactors = FALSE)
for(i in 1:n){
df$x[i...
How can I have lowercase routes in ASP.NET MVC?
...rrent.Request.Url.Query;
Response.Clear();
Response.Status = "301 Moved Permanently";
Response.AddHeader("Location", lowercaseURL);
Response.End();
}
}
}
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grep using a character vector with multiple patterns
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273
In addition to @Marek's comment about not including fixed==TRUE, you also need to not have the s...
How to debug Lock wait timeout exceeded on MySQL?
...----------
SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 9014315, signal count 7805377
Mutex spin waits 0, rounds 11487096053, OS waits 7756855
RW-shared spins 722142, OS waits 211221; RW-excl spins 787046, OS waits 39353
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LATEST FOREIGN KEY ERROR
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Can vim monitor realtime changes to a file
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103
You can :set autoread so that vim reads the file when it changes. However (depending on your pla...
NUnit Unit tests not showing in Test Explorer with Test Adapter installed
I've installed NUnit Test Adapter for VS2012 + 2013. When I first installed the Adapter tests were showing up, but they stopped showing up for some reason today. After building, rebuilding, cleaning, restarting, nothing shows up in Test Explorer. Why would this be happening? I'm using VS2013 Ult...
Cartesian product of multiple arrays in JavaScript
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