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What is a “cache-friendly” code?
...ran,matlab) vs. row-major ordering (ex. c,c++) for storing two dimensional arrays. For example, consider the following matrix:
1 2
3 4
In row-major ordering, this is stored in memory as 1 2 3 4; in column-major ordering, this would be stored as 1 3 2 4. It is easy to see that implementations which ...
How can I sharpen an image in OpenCV?
...ry a simple kernel and the filter2D function, e.g. in Python:
kernel = np.array([[-1,-1,-1], [-1,9,-1], [-1,-1,-1]])
im = cv2.filter2D(im, -1, kernel)
Wikipedia has a good overview of kernels with some more examples here - https://en.wikipedia.org/wiki/Kernel_(image_processing)
In image proce...
Performance differences between debug and release builds
...g optimized code so difficult. And giving the volatile keyword a meaning.
Array index checking elimination. An important optimization when working with arrays (all .NET collection classes use an array internally). When the JIT compiler can verify that a loop never indexes an array out of bounds t...
Remove element by id
...ts")[0].remove(); ] I think the function remove() ist not implemented by arrays. In order to remove all elements of a class or any selector returning an array, you have to iterate through all elements and call remove() on each.
– Sedat Kilinc
Dec 21 '14 at 17...
Different types of thread-safe Sets in Java
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1) The CopyOnWriteArraySet is a quite simple implementation - it basically has a list of elements in an array, and when changing the list, it copies the array. Iterations and other accesses which are running at this time continue with the old ...
list.clear() vs list = new ArrayList(); [duplicate]
Which one of the 2 options is better and faster to clear an ArrayList, and why?
8 Answers
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How to display length of filtered ng-repeat data
I have a data array which contains many objects (JSON format). The following can be assumed as the contents of this array:
...
Why do I need 'b' to encode a string with Base64?
...
Short Answer
You need to push a bytes-like object (bytes, bytearray, etc) to the base64.b64encode() method. Here are two ways:
>>> data = base64.b64encode(b'data to be encoded')
>>> print(data)
b'ZGF0YSB0byBiZSBlbmNvZGVk'
Or with a variable:
>>> string = '...
When to use nil, blank, empty? [duplicate]
...may be used to check on various object types like empty string "" or empty array []
blank? - checks for nil? or empty?.
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Controlling fps with requestAnimationFrame?
...variable in the object each setInterval 'frame'. Keep these objects in an array. Set your interval to your desired fps in ms: ms=(1000/fps). This keeps a steady clock that allows the same fps on any device, regardless of RAF speed. Do not assign the transforms to the elements here!
In a reques...