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Is file append atomic in UNIX?
... update atomicity = at least 1Mb, probably infinite (*)
You can see the raw empirical test results at https://github.com/ned14/afio/tree/master/programs/fs-probe. Note we test for torn offsets only on 512 byte multiples, so I cannot say if a partial update of a 512 byte sector would tear during t...
How to find out what type of a Mat object is with Mat::type() in OpenCV
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For debugging purposes in case you want to look up a raw Mat::type in a debugger:
+--------+----+----+----+----+------+------+------+------+
| | C1 | C2 | C3 | C4 | C(5) | C(6) | C(7) | C(8) |
+--------+----+----+----+----+------+------+------+------+
| CV_8U | 0 | ...
C# using streams
....io.stream.aspx
Memorystream and FileStream are streams used to work with raw memory and Files respectively...
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Test if string is a number in Ruby on Rails
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From Rails 'validates_numericality_of': raw_value.to_s =~ /\A[+-]?\d+\Z/
– Morten
Aug 17 '12 at 20:09
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How do I find Waldo with Mathematica?
...pick out the pixels in the image with a sufficiently high correlation and draw white circle around them to emphasize them using Dilation
pos = Dilation[ColorNegate[Binarize[corr, .12]], DiskMatrix[30]];
I had to play around a little with the level. If the level is too high, too many false positiv...
How do I get whole and fractional parts from double in JSP/Java?
...hole: 3
Fraction: .25
That's it. No need to massage it with help of raw Java code.
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What is the point of function pointers?
...jects) for the same result.
The functors have a number of advantages over raw function pointers, due to their object nature, notably:
They may present several overloads of the operator()
They can have state / reference to existing variables
They can be built on the spot (lambda and bind)
I pers...
How can I read a large text file line by line using Java?
...u can skip the InputStream and use FileReader.
InputStream ins = null; // raw byte-stream
Reader r = null; // cooked reader
BufferedReader br = null; // buffered for readLine()
try {
String s;
ins = new FileInputStream("textfile.txt");
r = new InputStreamReader(ins, "UTF-8"); // leave c...