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Execute the setInterval function without delay the first time
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edited Jun 5 at 10:58
answered Jul 13 '11 at 20:45
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Empty set literal?
...>> print(s)
set()
this is basically a more condensed way of doing {_ for _ in ()}, but, don't do this.
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What's the fastest way to merge/join data.frames in R?
... 3x slower than data.table and in the second its 200x faster than plyr and 100 times faster than data.table. Below we show the input code, the output timings for the merge and the output timings for the aggregate. Its also worthwhile noting that sqldf is based on a database and therefore can hand...
How can I parse a time string containing milliseconds in it with python?
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compie
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answered Mar 30 '09 at 17:49
DNSDNS
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Rename specific column(s) in pandas
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Timings:
%%timeit
df.rename(columns={'gdp':'log(gdp)'}, inplace=True)
10000 loops, best of 3: 168 µs per loop
%%timeit
df.columns = ['log(gdp)' if x=='gdp' else x for x in df.columns]
10000 loops, best of 3: 58.5 µs per loop
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内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...额外空间。例如，分配N个8字节对象可能要使用大约8N * 1.01字节的空间。即，多用百分之一的空间。Ptmalloc2使用最少8字节描述一个chunk。
更快。小对象几乎无锁， >32KB的对象从CentralCache中分配使用自旋锁。 并且>32KB对象都是页...
Update multiple rows in same query using PostgreSQL
...w sql construct today
– javadba
Sep 10 at 19:47
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Finding Variable Type in JavaScript
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answered Dec 16 '10 at 0:22
Felix KlingFelix Kling
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Algorithm to detect overlapping periods [duplicate]
...awlingRawling
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RESTful Authentication via Spring
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bluish
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answered Jun 2 '12 at 16:33
Chris CashwellChris Cashwell
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