大约有 270 项符合查询结果（耗时：0.0094秒） [XML]
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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Regular expression to match a line that doesn't contain a word
...┬──┐
S = │e1│ A │e2│ B │e3│ h │e4│ e │e5│ d │e6│ e │e7│ C │e8│ D │e9│
└──┴───┴──┴───┴──┴───┴──┴───┴──┴───┴──┴───┴──┴───┴──┴───┴──┘
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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 to check if remote branch exists on a given remote repository?
...a4c1b1a4be39e2f1a2bc refs/heads/2-1-stable
c6cb5a5ab00ac9e857e5b2757d2bce6a5ad14b32 refs/heads/2-2-stable
e0774e47302a907319ed974ccf59b8b54d32bbde refs/heads/2-3-stable
13ad87971cc16ebc5c286b484821e2cb0fc3e3b1 refs/heads/3-0-stable
3df6c73f9edb3a99f0d51d827ef13a439f31743a refs/heads/3...
How to find the statistical mode?
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I measured running time with a factor of 1e6 elements and this solution was faster than the accepted answer by almost factor 3!
– vonjd
Jun 6 '16 at 10:34
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How to fix “Referenced assembly does not have a strong name” error?
...00094000000060200000024000052534131000400000100010093d86f6656eed3
b62780466e6ba30fd15d69a3918e4bbd75d3e9ca8baa5641955c86251ce1e5a83857c7f49288eb
4a0093b20aa9c7faae5184770108d9515905ddd82222514921fa81fff2ea565ae0e98cf66d3758
cb8b22c8efd729821518a76427b7ca1c979caa2d78404da3d44592badc194d05bfdd29b9b812...
Differences between Emacs and Vim
... community wiki
3 revs, 2 users 96%Senthil Kumaran
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How do you design object oriented projects? [closed]
... community wiki
2 revs, 2 users 96%Darryl
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