大约有 20,000 项符合查询结果（耗时：0.0462秒） [XML]
Getting value of public static final field/property of a class in Java via reflection
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answered Apr 21 '10 at 18:06
M. JessupM. Jessup
7,59811 gold badge2222 silver badges2929 bronze badges
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Summarizing multiple columns with dplyr? [duplicate]
...1
#> 2 2 3.03 3.04 2.97 2.87
#> 3 3 2.85 2.95 2.95 3.06
If you want to summarize only certain columns, use summarise_at or summarise_if functions.
Alternatively, the purrrlyr package provides the same functionality:
library(purrrlyr)
df %>% slice_rows("grp") %>% dmap(mea...
Is there a better way of writing v = (v == 0 ? 1 : 0); [closed]
... you.
– Ollie Glass
Aug 2 '11 at 12:06
1
I'm a big fan of @Guffa's answer too - in the words of l...
.rar, .zip files MIME Type
...urn TRUE;
}
// ZIP magic number: none, though PK\003\004, PK\005\006 (empty archive),
// or PK\007\008 (spanned archive) are common.
// http://en.wikipedia.org/wiki/ZIP_(file_format)
if ($ext == '.zip' and substr($bytes, 0, 2) == 'PK') {
return TRUE;
}
return F...
Can PNG image transparency be preserved when using PHP's GDlib imagecopyresampled?
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– santiago arizti
Apr 13 '17 at 20:06
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In an array of objects, fastest way to find the index of an object whose attributes match a search
... 3)
– Umair Ahmed
Dec 21 '16 at 10:06
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show 6 more comme...
How to find out how many lines of code there are in an Xcode project?
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answered Dec 15 '10 at 14:06
Matthew FrederickMatthew Frederick
21.9k1010 gold badges6565 silver badges9494 bronze badges
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How can I perform a `git pull` without re-entering my SSH password?
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edited Apr 29 '18 at 17:06
answered Aug 23 '17 at 8:52
in...
What is this weird colon-member (“ : ”) syntax in the constructor?
...st order?
– ryf9059
Jan 7 '13 at 12:06
1
@ryf9059: Why do you think it will be inconvenient? You ...
Tools for JPEG optimization? [closed]
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– Collin Anderson
Dec 13 '12 at 20:06
3
Progressive needs a lot more memory to decode. Regular j...