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How can the Euclidean distance be calculated with NumPy?
...er too much if you use sqrt-sum with axis=0, linalg.norm with axis=0, or
a_min_b = a - b
numpy.sqrt(numpy.einsum('ij,ij->j', a_min_b, a_min_b))
which is, by a slight margin, the fastest variant. (That actually holds true for just one row as well.)
The variants where you sum up over the second...
Is there any overhead to declaring a variable within a loop? (C++)
...the Original Post!
– Alex Brown
Jun 21 '14 at 1:09
2
I like answers that back the theory with pro...
How to convert a string to number in TypeScript?
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Thanatos
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answered Feb 3 '13 at 1:19
Ryan CavanaughRyan C...
Compiling simple Hello World program on OS X via command line
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answered Nov 1 '10 at 21:42
Martin YorkMartin York
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How to concatenate strings in twig
...andro DesantisAlessandro Desantis
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3
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cleanest way to skip a foreach if array is empty [duplicate]
...Common SenseYour Common Sense
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3
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Bogus foreign key constraint fail
...neccessary to write all the drop statements in one query, eg.
SET FOREIGN_KEY_CHECKS=0;
DROP TABLE my_first_table_to_drop;
DROP TABLE my_second_table_to_drop;
SET FOREIGN_KEY_CHECKS=1;
Where the SET FOREIGN_KEY_CHECKS=1 serves as an extra security measure...
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Error 1022 - Can't write; duplicate key in table
...raints are currently in use you can use the following query:
SELECT `TABLE_SCHEMA`, `TABLE_NAME`
FROM `information_schema`.`KEY_COLUMN_USAGE`
WHERE `CONSTRAINT_NAME` IN ('iduser', 'idcategory');
share
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PHP function to get the subdomain of a URL
...
Here's a one line solution:
array_shift((explode('.', $_SERVER['HTTP_HOST'])));
Or using your example:
array_shift((explode('.', 'en.example.com')));
EDIT: Fixed "only variables should be passed by reference" by adding double parenthesis.
EDIT 2: Star...
How to HTML encode/escape a string? Is there a built-in?
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edited Apr 2 '16 at 21:45
the Tin Man
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