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Generate all permutations of a list without adjacent equal elements
... yield [e] + perm
else:
yield []
Note that in this form the function is not very efficient, as it creates lots of sub-lists. Also, we can speed it up by looking at the most-constrained numbers first (those with the highest count). Here's a much more efficient version using on...
Peak detection in a 2D array
...y: we must erode the background in order to
#successfully subtract it form local_max, otherwise a line will
#appear along the background border (artifact of the local maximum filter)
eroded_background = binary_erosion(background, structure=neighborhood, border_value=1)
#we obtain ...
What's the difference between using “let” and “var”?
...i" to be defined outside the loop body contains within brackets and to NOT form a "closure" around "i".Of course your example proves otherwise. I think it is a bit confusing from the syntax point of view but this scenario is so common it makes sense to support it in that way. Many thanks for bringin...
Why Qt is misusing model/view terminology?
...he behavior and data of the application domain, responds to requests for information about its state (usually from the view), and responds to instructions to change state (usually from the controller).
In light of that I would answer your three main concerns thusly:
In fact a Qt component "mana...
javac is not recognized as an internal or external command, operable program or batch file [closed]
...allation of Java on Windows requires some manual steps. You must always perform these steps after installing Java, including after upgrading the JDK.
Environment variables and PATH
(If you already understand this, feel free to skip the next three sections.)
When you run javac HelloWorld.java, cmd...
What's the difference between faking, mocking, and stubbing?
...
You can get some information :
From Martin Fowler about Mock and Stub
Fake objects actually have working implementations, but usually take some shortcut which makes them not suitable for production
Stubs provide canned answers to calls made dur...
How to determine if a number is a prime with regex?
...ome non empty sub-sequence that can be repeated at least twice in order to form the sequence. If such a subsequence exists, it means that its length divides N, hence N is not prime.
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What is the purpose of Rank2Types?
..., the rough idea is that polymorphic types don't really have the a -> b form that they do in Haskell; in reality, they look like this, always with explicit quantifiers:
id :: ∀a.a → a
id = Λt.λx:t.x
If you don't know the "∀" symbol, it's read as "for all"; ∀x.dog(x) means "for all x,...
What is the difference between class and instance attributes?
...
Beyond performance considerations, there is a significant semantic difference. In the class attribute case, there is just one object referred to. In the instance-attribute-set-at-instantiation, there can be multiple objects referred ...
What is the difference between JSON and Object Literal Notation?
...at JSON actually is. JSON is a textual, language-independent data-exchange format, much like XML, CSV or YAML.
Data can be stored in many ways, but if it should be stored in a text file and be readable by a computer, it needs to follow some structure. JSON is one of the many formats that define suc...