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How many digits System.nanoTime() produce. Whether these digits are fixed or can vary in count?
Thanks
System.nanotime returns a high-resolution clock value from your system. It does not have any kind of defined interpretation other than that if you take the difference between the return value from two separate calls to System.nanotime, you will get an approximate number of nanoseconds that elapsed between those calls.
So the number of digits is not fixed, because there is no specific format for System.nanotime's value, and there is no meaningful way to interpret it. Only use the difference between two calls to System.nanotime.
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If you use Slf4j and the log.info("The value is: %s", "a_value") you will get output like: The value is: %s. This is totally different from what you might get with log.info(String.format("The value is: %s", "a_value")), being more like: The value is: a_value.
I don't really need to know what the right format is, so much as WHY the format for log messages in Slf4j is NOT the same as the format for java.lang.String#format and whether that's actually still a valid reason in Java, what, 10?
As the SLF4J FAQ says, it uses a different format because the format it uses can be processed up to 10x faster.
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How to round up a decimal number to a whole number?
So for example when it is 1.25 rounds to 1 or -3.25 rounds to -3 etc
if you want decimal part do this .
double value = 1.25;
int i = (int)value;
if you want to round value , do this
Math.round(value);
Use Math.round(float number) method http://docs.oracle.com/javase/6/docs/api/java/lang/Math.html#round(float) if you want to round it. If you want to cut decimal part just cast it to int.
A small trick I've learned during the years is just adding the value 0.5 to the value you want to round. After you did that, you can round it to an integer.
It's a generic workaround, which will work with alot of programming languages.
I dont know much about Java, but I think you will find a round-Method in the API. The package should be Math.
Edit:\
To round UP you could just add 1 instead of the value 0.5.
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I think this is not hard in C with pointers. However, how would one do this in java? EG a float is represented as 101001, and you want the integer represented by 101001 (obviously shortened since they're really 32 bits)? Just curious.
I think you want Float.floatToIntBits().
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Bayesian network: Please am currently doing a project on bayesian networks in java and am stuck on how to calculate p(a|b) because from a questionnaire, i only have the values of p(a), p(b). Please anyone with experience in this field can help me out. websites that i checked required that i have the value of p(anb). How do i calculate p(anb) in this case since the probabilities if a, b were calculated from a questionnaire Please anybody help me out and i have to calculate this p(a|b) for several variables. I would really appreciate if anyone helps me out. Thanks
Bayes' theorem states that the probability of A given B, P(A|B), is equal to the probability of both A and B occurring, P(A∩B), divided by the probability that B occurs, P(B).
That is,
p(A|B) = P(A∩B) / P(B)
Now, P(A∩B) is equal to the probability of B given A, P(B|A), times the probability of A, P(A).
That is,
P(A∩B) = P(B|A) x P(A)
In your experiments, P(B|A) should already be known from your sample. That is, of the total population of A, how many samples correspond to B.
This would give the final formula,
p(A|B) = [P(B|A) x P(A)] / P(B)
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In java I noticed there are methods associated with conversion of strings and those methods sometimes use the word "parse" in the name of the method. For example the static method,
static int parseInt(String str)
is used to convert a string into int. My question is this. Is "parse" short for another word? Is it just a random word or did it come from somewhere else in some other programming context in Java or anywhere else?
From wikipedia:
Parsing or syntactic analysis is the process of analysing a string of symbols, either in natural language or in computer languages, according to the rules of a formal grammar. The term parsing comes from Latin pars (ōrātiōnis), meaning part (of speech).