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Simple way to calculate median with MySQL
...al FROM data ORDER BY val limit @middlevalue) x;
I tested this with a 5x10e6 dataset of random numbers and it will find the median in under 10 seconds.
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How to know if an object has an attribute in Python
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@e5: you have a fair point in this case, but in many cases EAFP is the only correct option. For example, if you check the existence of a file and then open it, expecting that it will definitely exist, your code is incorrect: t...
filter for complete cases in data.frame using dplyr (case-wise deletion)
...his maybe as part of filter.
library('rbenchmark')
library('dplyr')
n = 5e6
n.na = 100000
df = data.frame(
x1 = sample(1:10, n, replace=TRUE),
x2 = sample(1:10, n, replace=TRUE)
)
df$x1[sample(1:n, n.na)] = NA
df$x2[sample(1:n, n.na)] = NA
benchmark(
df %>% filter(complete.cases(x...
What is the JavaScript version of sleep()?
... community wiki
2 revs, 2 users 96%StephaneAG
39
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BLE 低功耗蓝牙调试助手：扫描、连接、读写、订阅通知（附 .aia 源码） · ...
...「发送」。
中途验证：日志里出现 收 你好↵ [E4 BD A0 E5 A5 BD 0A] 这样的行，前面是文本、方括号里是原始字节。
下次打开 App，点「重连 设备名」会先扫描、扫到后自动连上。
核心代码
完整积木在 .aia 里...
How does this giant regex work?
...xt252O3dneQMzwRxRkCaqwfde8CDuVIQ+fYgecTwZP0xz9GmoC4++SVWAAPMJsfLBCG83jcRdJgB7597+xtctMYcQGOLcx1Yas7IcfWJlx7HpKhcHIMBDBf4hpNZLaLA7nLnaHC4ML8yVtDF95LaFn4sAPFjDKGLQPvJbfv37fPT6t1qubWCCQYC28qUUllwKcVWx4twGDQCs+Tr0b/FiKnKHbnQQDFz7S0Bjh0FBfiX9LAy9yYHLpyu6PDOBMKs80DmAA9RcDhAU4eCrLwZBq2T41K1K80x8PvLCsJRCqfC...
How to set child process' environment variable in Makefile
... community wiki
4 revs, 2 users 96%ThorSummoner
6
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Python progression path - From apprentice to guru
... community wiki
3 revs, 2 users 96%wheaties
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How do you squash commits into one patch with git format-patch?
...:~/example (tmpsquash)$ git commit -a -m "My squashed commits"
[test2 6127e5c] My squashed commits
11 files changed, 212 insertions(+), 59 deletions(-)
laura@rune:~/example (tmpsquash)$ git format-patch master
0001-My-squashed-commits.patch
laura@rune:~/example (tmpsquash)$ git checkout master
Sw...
What does Maven Update Project do in Eclipse?
...oes in here:
https://github.com/eclipse/m2e-core/blob/41f5ae34ad2543ef1439b7fd7e0a03b596af8685/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/project/ProjectConfigurationManager.java#L365
Look for : updateProjectConfiguration0 function.
Cheers,
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