大约有 49,000 项符合查询结果（耗时：0.0465秒） [XML]
Real world use cases of bitwise operators [closed]
...
|
edited Jan 19 '10 at 23:34
community wiki
...
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...
How to store int[] array in application Settings
...
answered Nov 24 '10 at 14:26
Jen-AriJen-Ari
2,16222 gold badges2222 silver badges1919 bronze badges
...
NodeJS: How to get the server's port?
...
Jörn HorstmannJörn Horstmann
31.1k1010 gold badges6363 silver badges109109 bronze badges
add a ...
Mocking Extension Methods with Moq
...owLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\...
Django REST framework: non-model serializer
...70/640916
– djangonaut
Dec 2 '15 at 10:16
|
show 4 more comments
...
Standardize data columns in R
... function on the data to do what you want.
dat <- data.frame(x = rnorm(10, 30, .2), y = runif(10, 3, 5))
scaled.dat <- scale(dat)
# check that we get mean of 0 and sd of 1
colMeans(scaled.dat) # faster version of apply(scaled.dat, 2, mean)
apply(scaled.dat, 2, sd)
Using built in functions...
Can dplyr package be used for conditional mutating?
...
10
mutate(g = ifelse(condition1, 2, ifelse(condition2, 3, g))
– G. Grothendieck
Mar 30 '17 at 19:53
...
When do we need curly braces around shell variables?
...%.*} (remove extension)
expanding positional parameters beyond 9: "$8 $9 ${10} ${11}"
Doing this everywhere, instead of just in potentially ambiguous cases, can be considered good programming practice. This is both for consistency and to avoid surprises like $foo_$bar.jpg, where it's not visually ...
Java Reflection: How to get the name of a variable?
...invokespecial #4; //Method java/lang/StringBuilder."<init>":()V
10: astore_3
11: aload_3
12: aload_2
13: invokevirtual #5; //Method java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
16: iload_1
17: invokevirtual #6; //Method java/lang/St...