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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...
How to convert an enum type variable to a string?
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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 ...
Pad a string with leading zeros so it's 3 characters long in SQL Server 2008
...ring that is up to 3 characters long when it's first created in SQL Server 2008 R2.
17 Answers
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Python: Continuing to next iteration in outer loop
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72
for i in ...:
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if something:
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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
6,85133 gold badges2929 silver badges4242 bronze badges
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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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What is the difference between float and double?
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528
Huge difference.
As the name implies, a double has 2x the precision of float[1]. In general a d...
fork() branches more than expected?
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245
The fork() primitive often stretches the imagination. Until you get a feel for it, you should...
SQL query for today's date minus two months
... select all the records in a table where their date of entry is older then 2 months.
5 Answers
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