大约有 39,300 项符合查询结果（耗时：0.0491秒） [XML]
“[notice] child pid XXXX exit signal Segmentation fault (11)” in apache error.log [closed]
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answered Oct 13 '11 at 10:15
Mattias WadmanMattias Wadman
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Drop data frame columns by name
...st of names :
DF <- data.frame(
x=1:10,
y=10:1,
z=rep(5,10),
a=11:20
)
drops <- c("x","z")
DF[ , !(names(DF) %in% drops)]
Or, alternatively, you can make a list of those to keep and refer to them by name :
keeps <- c("y", "a")
DF[keeps]
EDIT :
For those still not acquainted wi...
How does one create an InputStream from a String? [duplicate]
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answered Apr 19 '11 at 17:54
anubhavaanubhava
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Java: how to convert HashMap to array
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Mayonnaise2124
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answered Jul 7 '09 at 5:47
Landon KuhnLandon Kuhn
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Printing hexadecimal characters in C
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edited Nov 9 '11 at 4:52
answered Nov 9 '11 at 4:02
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Forward declaring an enum in C++
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KJAWolfKJAWolf
2,57011 gold badge1414 silver badges66 bronze badges
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Detect IE version (prior to v9) in JavaScript
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weroroweroro
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Writing/outputting HTML strings unescaped
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LorenzoLorenzo
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A worthy developer-friendly alternative to PayPal [closed]
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As of October 2013, Stripe supports merchants in 11 countries: stripe.com/global
– anurag
Oct 26 '13 at 23:17
3
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Return empty cell from formula in Excel
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J.T. GrimesJ.T. Grimes
4,00411 gold badge2525 silver badges3131 bronze badges
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