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What's the opposite of head? I want all but the first N lines of a file
...xt file of unknown length, how can I read, for example all but the first 2 lines of the file? I know tail will give me the last N lines, but I don't know what N is ahead of time.
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Is R's apply family more than syntactic sugar?
...ntly different performance:
> fibo <- function(n) {
+ if ( n < 2 ) n
+ else fibo(n-1) + fibo(n-2)
+ }
> system.time(for(i in 0:26) fibo(i))
user system elapsed
7.48 0.00 7.52
> system.time(sapply(0:26, fibo))
user system elapsed
7.50 0.00 7.54
> s...
fork() branches more than expected?
...
245
The fork() primitive often stretches the imagination. Until you get a feel for it, you should...
Is unsigned integer subtraction defined behavior?
...t can be
represented by the resulting type.
(ISO/IEC 9899:1999 (E) §6.2.5/9)
As you can see, (unsigned)0 - (unsigned)1 equals -1 modulo UINT_MAX+1, or in other words, UINT_MAX.
Note that although it does say "A computation involving unsigned operands can never overflow", which might lead ...
How to wait in a batch script? [duplicate]
I am trying to write a batch script and trying to wait 10 seconds between 2 function calls. The command:
6 Answers
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What is the difference between float and double?
...
528
Huge difference.
As the name implies, a double has 2x the precision of float[1]. In general a d...
How to open a Bootstrap modal window using jQuery?
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edited Aug 25 '19 at 2:52
Rahmat Ali
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John Carmack's Unusual Fast Inverse Square Root (Quake III)
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answered Aug 28 '09 at 21:52
RushyoRushyo
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Use 'import module' or 'from module import'?
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edited Jan 27 '14 at 22:14
NullUserException
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How to remove an item for a OR'd enum?
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edited Aug 9 '16 at 20:53
David Sherret
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