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Why does a RegExp with global flag give wrong results?
...r expression match of string
against the regular expression and
returns an Array object containing the
results of the match, or null if the
string did not match The string
ToString(string) is searched for an
occurrence of the regular expression
pattern as follows:
Let R be this RexExp object.
Let...
Does pandas iterrows have performance issues?
...ically typed language, so there is runtime overhead for each element in an array. However, Numpy (and thus pandas) perform calculations in C (often via Cython). The type of the array is determined only at the start of the iteration; this savings alone is one of the biggest wins.
Better caching: Iter...
Why is there no logical xor in JavaScript?
...aluate from left to right and return the last evaluated value. Or maybe an array containing both values?
And if one operand is truthy and the other operand is falsy, an xor should return the truthy one. Or maybe an array containing the truthy one, to make it compatible with the previous case?
And ...
Why would I prefer using vector to deque
...e. So if you need to interact with a plain C library that needs contiguous arrays, or if you care (a lot) about spatial locality, then you might prefer vector. In addition, since there is some extra bookkeeping, other ops are probably (slightly) more expensive than their equivalent vector operations...
Check if a string contains one of 10 characters
... possibly easier to read form:
var match = str.IndexOfAny("*&#".ToCharArray()) != -1
Depending on the context and performance required, you may or may not want to cache the char array.
share
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Difficulty with ng-model, ng-repeat, and inputs
...tter 'f' into input;
ngModelController changes model for item scope (names array is not changed) => name == 'Samf', names == ['Sam', 'Harry', 'Sally'];
$digest loop is started;
ngRepeat replaces model value from item scope ('Samf') by value from unchanged names array ('Sam');
ngModelController re...
Converting JSON data to Java object
...ogle Gson supports generics and nested beans. The [] in JSON represents an array and should map to a Java collection such as List or just a plain Java array. The {} in JSON represents an object and should map to a Java Map or just some JavaBean class.
You have a JSON object with several properties o...
Can an Option in a Select tag carry multiple values?
...
One way to do this, first one an array, 2nd an object:
<select name="">
<option value='{"num_sequence":[0,1,2,3]}'>Option one</option>
<option value='{"foo":"bar","one":"two"}'>Option two</option>
</s...
Sorting 1 million 8-decimal-digit numbers with 1 MB of RAM
... // consumes 32000 bytes
...
Together, these two arrays take 1045000 bytes of storage. That leaves 1048576 - 1045000 - 2×1024 = 1528 bytes for remaining variables and stack space.
It runs in about 23 seconds on my Xeon W3520. You can verify that the program works using th...
How can I improve my paw detection?
...) but this isn't quite working properly for some reason...)
Threshold the array so that you have a boolean array of places where the pressure is over some threshold value (i.e. thresh = data > value)
Fill any internal holes, so that you have cleaner regions (filled = sp.ndimage.morphology.binary...