大约有 15,000 项符合查询结果（耗时：0.0155秒） [XML]
What are the options for storing hierarchical data in a relational database? [closed]
...e for one or the other especially if there are more than, say, a lousy 100,000 nodes or so. Using the push stack method can take a whole day to do the conversion on what MLM'ers would consider to be a small million node hierarchy.
I thought I'd give Celko a bit of competition by coming up with a m...
1114 (HY000): The table is full
...
You will also get the same error ERROR 1114 (HY000): The table '#sql-310a_8867d7f' is full
if you try to add an index to a table that is using the storage engine MEMORY.
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Printf width specifier to maintain precision of floating-point value
...he number of digits after the decimal point.
For a number like OneSeventh/1000000.0, one would need OP_DBL_Digs + 6 to see all the significant digits.
printf("%.*f\n", OP_DBL_Digs , OneSeventh);
// 0.14285714285714285
printf("%.*f\n", OP_DBL_Digs + 6, OneSeventh/1000000.0);
// 0.0000001428571428...
Fitting empirical distribution to theoretical ones with Scipy (Python)?
INTRODUCTION : I have a list of more than 30,000 integer values ranging from 0 to 47, inclusive, e.g. [0,0,0,0,..,1,1,1,1,...,2,2,2,2,...,47,47,47,...] sampled from some continuous distribution. The values in the list are not necessarily in order, but order doesn't matter for this problem.
...
Set width of TextView in terms of characters
...'.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f6162315%2fset-width-of-textview-in-terms-of-characters%23new-answer', 'question_page');
}
);
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Remove a string from the beginning of a string
...efix) {
$str = substr($str, strlen($prefix));
}
Takes: 0.0369 ms (0.000,036,954 seconds)
And with:
$prefix = 'bla_';
$str = 'bla_string_bla_bla_bla';
$str = preg_replace('/^' . preg_quote($prefix, '/') . '/', '', $str);
Takes: 0.1749 ms (0.000,174,999 seconds) the 1st run (compiling), and...
Python string class like StringBuilder in C#?
...61, 6GB RAM, Debian GNU/Linux 6.0.6 (squeeze).
Here is the result for 10,000 iterations:
method1: 0.0538418292999 secs
process size 4800 kb
method2: 0.22602891922 secs
process size 4960 kb
method3: 0.0605459213257 secs
process size 4980 kb
method4: 0.0544030666351 secs
process size 5536 kb
m...
Performance difference for control structures 'for' and 'foreach' in C#
...orlib]System.Collections.Generic.List`1/Enumerator<object> V_1)
IL_0000: ldarg.0
IL_0001: callvirt instance valuetype [mscorlib]System.Collections.Generic.List`1/Enumerator<!0> class [mscorlib]System.Collections.Generic.List`1<object>::GetEnumerator()
IL_0006: stloc.1
...
Why aren't variables declared in “try” in scope in “catch” or “finally”?
...eader sr,
[1] class [mscorlib]System.Exception ex)
IL_0000: ldnull
IL_0001: stloc.0
.try
{
.try
{
IL_0002: ldsfld string UsingTest.Class1::path
IL_0007: newobj instance void [mscorlib]System.IO.StreamReader::.ctor...
Calculate the median of a billion numbers
...
sort -g numbers | head -n 500000001 | tail -n 2 | dc -e "1 k ? ? + 2 / p"
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