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What does the “at” (@) symbol do in Python?
...
331
An @ symbol at the beginning of a line is used for class, function and method decorators.
Rea...
What is the equivalent of MATLAB's repmat in NumPy
...h multiple dimensions and gives a similar result to matlab. (Numpy gives a 3d output array as you would expect - matlab for some reason gives 2d output - but the content is the same).
Matlab:
>> repmat([1;1],[1,1,1])
ans =
1
1
Python:
In [46]: a = np.array([[1],[1]])
In [47]: n...
Test if lists share any items in python
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322
Short answer: use not set(a).isdisjoint(b), it's generally the fastest.
There are four common...
Syntax error on print with Python 3 [duplicate]
Why do I receive a syntax error when printing a string in Python 3?
3 Answers
3
...
How does PHP 'foreach' actually work?
...ction iterate($arr) {
foreach ($arr as $v) {}
}
$outerArr = [0, 1, 2, 3, 4];
iterate($outerArr);
Here, $arr will be duplicated to prevent IAP changes on $arr from leaking to $outerArr. In terms of the conditions above, the array is not a reference (is_ref=0) and is used in two places (refcoun...
How to Correctly Use Lists in R?
...:
Why do these two expressions not return the same result?
x = list(1, 2, 3, 4); x2 = list(1:4)
A list can contain any other class as each element. So you can have a list where the first element is a character vector, the second is a data frame, etc. In this case, you have created two different ...
Bootstrap 3 breakpoints and media queries
On the Bootstrap 3 media queries documentation it says:
10 Answers
10
...
How to update Identity Column in SQL Server?
...n the identity column
INSERT INTO YourTable(IdentityCol, otherCol) VALUES(13,'myValue')
GO
-- Delete the old row of which you have inserted a copy (above) (make sure about FK's)
DELETE FROM YourTable WHERE ID=3
GO
--Now set the idenetity_insert OFF to back to the previous track
SET IDENTITY_INSERT Y...
Numpy array dimensions
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513
It is .shape:
ndarray.shape
Tuple of array dimensions.
Thus:
>>> a.shape
(2, 2...
How to get the nth element of a python list or a default if not available
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