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Image comparison - fast algorithm
...rithm
Computing the color histograms is straightforward -- just pick the range for your histogram buckets, and for each range, tally the number of pixels with a color in that range. For example, consider the "green" histogram, and suppose we choose 4 buckets for our histogram: 0-63, 64-127, 128-1...
do N times (declarative syntax)
...st-4966.3ms / 2nd-4929.0ms Moral of the story if u are not in the billion+ range u would never notice a difference running these 200, 1k, even 10k times to do something. Figured someone might be curious like me.
– rifi2k
Feb 15 '19 at 3:22
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Array slicing in Ruby: explanation for illogical behaviour (taken from Rubykoans.com)
... nil
* array[start, length] -> an_array or nil
* array[range] -> an_array or nil
* array.slice(index) -> obj or nil
* array.slice(start, length) -> an_array or nil
* array.slice(range) -> an_array or nil
which su...
How can I open multiple files using “with open” in Python?
... print('exit {!r}'.format(self))
return True
xs = [X() for _ in range(3)]
with ExitStack() as stack:
print(len(stack._exit_callbacks)) # number of callbacks called on exit
nums = [stack.enter_context(x) for x in xs]
print(len(stack._exit_callbacks))
print(len(stack._exit_cal...
Rollback to an old Git commit in a public repo
...'s not necessary to use git revert X times. git revert can accept a
commit range as an argument, so you only need to use it once to revert a range
of commits. For example, if you want to revert the last 20 commits:
git revert --no-edit HEAD~20..
The commit range HEAD~20.. is short for HEAD~20..HE...
Produce a random number in a range using C#
How do I go about producing random numbers within a range?
7 Answers
7
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What is the recommended way to delete a large number of items from DynamoDB?
... want to do is call LogTable.DeleteItem(user_id) -
Without supplying the range, and have it delete everything for me.
An understandable request indeed; I can imagine advanced operations like these might get added over time by the AWS team (they have a history of starting with a limited feature s...
How to create a sequence of integers in C#?
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You can use Enumerable.Range(0, 10);. Example:
var seq = Enumerable.Range(0, 10);
MSDN page here.
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How do I clone a range of array elements to a new array?
...ut I don't think there's a method which creates the new array and copies a range of elements.
If you're using .NET 3.5 you could use LINQ:
var newArray = array.Skip(3).Take(5).ToArray();
but that will be somewhat less efficient.
See this answer to a similar question for options for more specifi...
C++ mark as deprecated
...e that you at some point need a section of preprocessed alternatives for a range of platforms. #ifdef this #ifdef that and so on.
In such a section you could very well conditionally define a way to deprecate symbols. My preference is usually to define a "warning" macro since most toolchains suppor...