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Find the Smallest Integer Not in a List
... you can do it in O(N) time and O(1) additional space. Just go through the array sequentially and for every index write the value at the index to the index specified by value, recursively placing any value at that location to its place and throwing away values > N. Then go again through the array...
How does python numpy.where() work?
...short answer is that they don't.
Any sort of logical operation on a numpy array returns a boolean array. (i.e. __gt__, __lt__, etc all return boolean arrays where the given condition is true).
E.g.
x = np.arange(9).reshape(3,3)
print x > 5
yields:
array([[False, False, False],
[Fals...
How does the Java 'for each' loop work?
...erable interface.
Also, if the right-hand side of the for (:) idiom is an array rather than an Iterable object, the internal code uses an int index counter and checks against array.length instead. See the Java Language Specification.
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How do I read CSV data into a record array in NumPy?
...f there is a direct way to import the contents of a CSV file into a record array, much in the way that R's read.table() , read.delim() , and read.csv() family imports data to R's data frame?
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Initializing a member array in constructor initializer
I believe the reason is that arrays can be initialized only with = syntax, that is:
6 Answers
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Numpy: Get random set of rows from 2D array
I have a very large 2D array which looks something like this:
7 Answers
7
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Sorting an array of objects in Ruby by object attribute?
I have an array of objects in Ruby on Rails. I want to sort the array by an attribute of the object. Is it possible?
9 Answ...
How to initialise memory with new operator in C++?
...to C++ and I want to pick up some good habits. If I have just allocated an array of type int with the new operator, how can I initialise them all to 0 without looping through them all myself? Should I just use memset ? Is there a “C++” way to do it?
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Swift Beta performance: sorting arrays
... I realized that one of the bottlenecks was something as simple as sorting arrays. The relevant part is here:
9 Answers
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Ternary operator is twice as slow as an if-else block?
...h of these cases.
X86, if/then
32: foreach (int i in array)
0000007c 33 D2 xor edx,edx
0000007e 83 7E 04 00 cmp dword ptr [esi+4],0
00000082 7E 1C jle 000000A0
00000084 8B 44 96 08 mov eax,dword ...