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Why are floating point numbers inaccurate?
...ing point numbers are represented a lot like scientific notation: with an exponent and a mantissa (also called the significand). A very simple number, say 9.2, is actually this fraction:
5179139571476070 * 2 -49
Where the exponent is -49 and the mantissa is 5179139571476070. The reason it is i...
What is the purpose of the var keyword and when should I use it (or omit it)?
What exactly is the function of the var keyword in JavaScript, and what is the difference between
19 Answers
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Reasons for using the set.seed function
...
The need is the possible desire for reproducible results, which may for example come from trying to debug your program, or of course from trying to redo what it does:
These two results we will "never" reproduce as I just asked for something "random":
R> sample(LETTERS, 5)
[1] "K" "N" "R" "Z" ...
Convert integer into byte array (Java)
...tional, the initial order of a byte buffer is always BIG_ENDIAN.
b.putInt(0xAABBCCDD);
byte[] result = b.array();
Setting the byte order ensures that result[0] == 0xAA, result[1] == 0xBB, result[2] == 0xCC and result[3] == 0xDD.
Or alternatively, you could do it manually:
byte[] toBytes(int i)
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DbEntityValidationException - How can I easily tell what caused the error?
...ject that uses Entity Framework. While calling SaveChanges on my DbContext , I get the following exception:
9 Answers
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What's with 181783497276652981 and 8682522807148012 in Random (Java 7)?
...o be distinct from any other invocation of this
constructor.
could be extended by "across threads" and "uncorrelated"
Seed Sequence Quality
But the randomness of the seeding sequence is only as good as the underlying RNG.
The RNG used for the seed sequence in this java implementation uses a m...
Useful code which uses reduce()? [closed]
...python? Is there any code other than the usual + and * that we see in the examples?
24 Answers
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SQL Server 2008: How to query all databases sizes?
... answered May 10 '11 at 6:37
Alex AzaAlex Aza
67.4k2323 gold badges144144 silver badges126126 bronze badges
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How to programmatically close a JFrame
...rrect way to get a JFrame to close, the same as if the user had hit the X close button, or pressed Alt + F4 (on Windows)?
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Drop unused factor levels in a subsetted data frame
...r . When I create a subset of this dataframe using subset or another indexing function, a new data frame is created. However, the factor variable retains all of its original levels, even when/if they do not exist in the new dataframe.
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