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When is assembly faster than C?
...Editor's note: more likely the FP latency bottleneck is enough to hide the extra cost of loop. Doing two Kahan summations in parallel for the odd/even elements, and adding those at the end, could maybe speed this up by a factor of 2.)
Whoops, I was running a slightly different version of the code ...
What is a non-capturing group in regular expressions?
...up 3: "n"
Group 4: "sectetuer"
...
So, if we apply the substitution string:
$1_$3$2_$4
... over it, we are trying to use the first group, add an underscore, use the third group, then the second group, add another underscore, and then the fourth group. The resulting string would be like the...
Difference between size_t and unsigned int?
...int is not the only unsigned integer type. size_t could be any of unsigned char, unsigned short, unsigned int, unsigned long or unsigned long long, depending on the implementation.
Second question is that size_t and unsigned int are interchangeable or not and if not then why?
They aren't inter...
How to export query result to csv in Oracle SQL Developer?
...
CSV Export does not escape your data. Watch out for strings which end in \ because the resulting \" will look like an escaped " and not a \. Then you have the wrong number of " and your entire row is broken.
...
How to convert floats to human-readable fractions?
....com/ShowCode.asp?ID=582):
Public Function Dec2Frac(ByVal f As Double) As String
Dim df As Double
Dim lUpperPart As Long
Dim lLowerPart As Long
lUpperPart = 1
lLowerPart = 1
df = lUpperPart / lLowerPart
While (df <> f)
If (df < f) Then
lUpperPart = lU...
Unique fields that allow nulls in Django
...here is that the normalized "blank" value for a form CharField is an empty string, not None. So if you leave the field blank, you get an empty string, not NULL, stored in the DB. Empty strings are equal to empty strings for uniqueness checks, under both Django and database rules.
You can force the...
How to create a trie in Python
...
Static memory-efficient Trie structures for Python (2.x and 3.x).
String data in a MARISA-trie may take up to 50x-100x less memory than
in a standard Python dict; the raw lookup speed is comparable; trie
also provides fast advanced methods like prefix search.
Based on marisa-trie C...
How does the Java 'for each' loop work?
...
for (Iterator<String> i = someIterable.iterator(); i.hasNext();) {
String item = i.next();
System.out.println(item);
}
Note that if you need to use i.remove(); in your loop, or access the actual iterator in some way, you canno...
How do I escape spaces in path for scp copy in Linux?
...\ c' .
does not work
scp localhost:'f/a b c' .
The reason is that the string is interpreted by the shell before the path is passed to the scp command. So when it gets to the remote the remote is looking for a string with unescaped quotes and it fails
To see this in action, start a shell with ...
Getting RAW Soap Data from a Web Reference Client running in ASP.net
... break;
}
}
public void Log(SoapMessage message, string stage)
{
newStream.Position = 0;
string contents = (message is SoapServerMessage) ? "SoapRequest " : "SoapResponse ";
contents += stage + ";";
StreamReader reader = new StreamReade...