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Generating random numbers in Objective-C
...tes. The arc4random() function returns pseudo-
random numbers in the range of 0 to (2**32)-1, and therefore has twice the range of rand(3) and
random(3).
The arc4random_stir() function reads data from /dev/urandom and uses it to permute the S-Boxes via
arc4random_addrandom().
...
Fastest way to check if a value exists in a list
...= []
time_method_set_in = []
time_method_bisect = []
# adjust range down if runtime is to great or up if there are to many zero entries in any of the time_method lists
Nls = [x for x in range(10000, 30000, 1000)]
for N in Nls:
a = [x for x in range(0, N)]
random....
Standardize data columns in R
... - positional standardization ((x-median)/mad)
n3 - unitization ((x-mean)/range)
n3a - positional unitization ((x-median)/range)
n4 - unitization with zero minimum ((x-min)/range)
n5 - normalization in range <-1,1> ((x-mean)/max(abs(x-mean)))
n5a - positional normalization in range <-1...
C# generic “where constraint” with “any generic type” definition?
... For posterity, a type CAN be created that has a type parameter of a raw generic type, but only with reflection at runtime, and the created class could never be constructed, because the raw generic type parameter could never be constructed automatically without a full definition of ITS respect...
How to convert a double to long without casting?
...gt;= Long.MIN_VALUE);
// we already know its whole and in the Long range
return Double.valueOf(specifiedNumber).longValue();
}
public static boolean isWhole(double specifiedNumber) {
// http://stackoverflow.com/questions/15963895/how-to-check-if-a-double-value-has-no...
Why does this iterative list-growing code give IndexError: list assignment index out of range?
... can't create an element by attempting to write to an index that is out of range. j[0] = "foo" will work if the list already has at least one element.
– Steve Mayne
Jan 28 '19 at 13:49
...
How can I get a resource content from a static context?
...st kidding. Well, your standard works for some resources like strings and drawables... however, as the documentation says, it does not work good for things like orientation measures, etc. Also, and most important, this won't allow you to get a global context which is sometimes useful for things that...
Generate random numbers using C++11 random library
... answer, it appears that uniform_real_distribution returns a number in the range [a, b), where you want [a, b]. To do that, our uniform_real_distibution should actually look like:
std::uniform_real_distribution<double> dist(1, std::nextafter(10, DBL_MAX));
...
Best way to check if object exists in Entity Framework?
...h I also sorted and trimmed to keep its length manageable).
Note that the raw data was a CSV file that contained many individual records that had to be parsed. The records in each consecutive file (which came at a rate of about 1 every 5 minutes) overlapped considerably, hence the high percentage ...
Advantages of Binary Search Trees over Hash Tables
...rve more memory than they need to.
For instance, if a hash function has a range R(h) = 0...100, then you need to allocate an array of 100 (pointers-to) elements, even if you are just hashing 20 elements. If you were to use a binary search tree to store the same information, you would only allocate ...