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How do you get the magnitude of a vector in Numpy?
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Pandas percentage of total with groupby
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(This solution is inspired from this article https://pbpython.com/pandas_transform.html)
I find the following solution to be the simplest(and probably the fastest) using transformation:
Transformation: While aggregation must return a reduced version of the
data, ...
Performance of FOR vs FOREACH in PHP
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What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
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How do I remove packages installed with Python's easy_install?
...command.
Install pip according to the installation instructions:
$ wget https://bootstrap.pypa.io/get-pip.py
$ python get-pip.py
Then you can use pip uninstall to remove packages installed with easy_install
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Iterate over the lines of a string
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Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=
...l_ci is advised against, as the performance improvement is negligible. See https://stackoverflow.com/a/766996/1432614
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Timeout expired. The timeout period elapsed prior to completion of the operation or the server is no
... completed before the waiting time expires.
See KB 2605597 for details
https://support.microsoft.com/kb/2605597
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Lost my schema.rb! Can it be regenerated?
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Rspec doesn't see my model Class. uninitialized constant error
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I have solved my problems reading the rspec-rails gem documentation :
https://github.com/rspec/rspec-rails#model-specs
where it confirms what Swards says about requiring "rails_helper" not "spec_helper" anymore.
Also my model specification looks more like the one from the gem docs
RSpec.desc...