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Math - mapping numbers
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Divide to get the ratio between the sizes of the two ranges, then subtract the starting value of your inital range, multiply by the ratio and add the starting value of your second range. In other words,
R = (20 - 10) / (6 - 2)
y = (x - 2) * R + 10
This evenly spreads the num...
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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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...
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...
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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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...
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...