大约有 39,165 项符合查询结果（耗时：0.0477秒） [XML]
Convert UNIX epoch to Date object
... val <- 1352068320
R> as.POSIXct(val, origin="1970-01-01")
[1] "2012-11-04 22:32:00 CST"
R> as.Date(as.POSIXct(val, origin="1970-01-01"))
[1] "2012-11-05"
R>
Edit: A few years later, we can now use the anytime package:
R> library(anytime)
R> anytime(1352068320)
[1] "2012-11-04...
Where do I find the current C or C++ standard documents?
...C and C++ standards documents in PDF are:
C++17 – ISO/IEC 14882:2017: $116 from ansi.org
C++14 – ISO/IEC 14882:2014: $90 NZD (about $60 US) from Standards New Zealand
C++11 – ISO/IEC 14882:2011: $60 from ansi.org $60 from Techstreet
C++03 – ISO 14882:2003: $30 from ansi.org $48 from SAI Gl...
Update all values of a column to lowercase
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answered May 28 '11 at 9:53
RippoRippo
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How to make Google Chrome JavaScript console persistent?
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hjing
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answered Oct 5 '11 at 13:10
Nick CoxNick Cox
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What does && mean in void *p = &&abc;
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edited Aug 24 '11 at 12:15
answered May 24 '11 at 6:34
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Disable IPython Exit Confirmation
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If you also want Ctrl-D to exit without confirmation, in IPython 0.11, add c.TerminalInteractiveShell.confirm_exit = False to your config file *.
If you don't have a config file yet, run ipython profile create to create one.
Note this ticket if you're working within the Django shell.
* ...
Does Git Add have a verbose switch
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B--rian
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answered Sep 6 '11 at 11:49
Sahil MuthooSahil M...
Why do x86-64 systems have only a 48 bit virtual address space?
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answered Jul 16 '11 at 11:16
jalfjalf
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how to log in to mysql and query the database from linux terminal
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edited Jun 1 '11 at 11:26
answered Jun 1 '11 at 11:15
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How do I create an immutable Class?
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answered Dec 9 '08 at 11:47
Blair ConradBlair Conrad
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