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Fast check for NaN in NumPy
I'm looking for the fastest way to check for the occurrence of NaN ( np.nan ) in a NumPy array X . np.isnan(X) is out of the question, since it builds a boolean array of shape X.shape , which is potentially gigantic.
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How do I test if a variable is a number in Bash?
...: Not a number" >&2; exit 1
fi
If the value is not necessarily an integer, consider amending the regex appropriately; for instance:
^[0-9]+([.][0-9]+)?$
...or, to handle numbers with a sign:
^[+-]?[0-9]+([.][0-9]+)?$
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In practice, what are the main uses for the new “yield from” syntax in Python 3.3?
I'm having a hard time wrapping my brain around PEP 380 .
8 Answers
8
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Determine Whether Integer Is Between Two Other Integers?
How do I determine whether a given integer is between two other integers (e.g. greater than/equal to 10000 and less than/equal to 30000 )?
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Declaring javascript object method in constructor function vs. in prototype [duplicate]
In creating javascript objects, I can put a method declaration either in the constructor function or in the prototype. For example, say I want a Dog class that has a Name property and a Bark method. I can put the declaration of the Bark method into the constructor function:
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Pass all variables from one shell script to another?
...ke the variable an environment variable (export TESTVARIABLE) before executing the 2nd script.
Source the 2nd script, i.e. . test2.sh and it will run in the same shell. This would let you share more complex variables like arrays easily, but also means that the other script could modify variables in ...
When is JavaScript synchronous?
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JavaScript is always synchronous and single-threaded. If you're executing a JavaScript block of code on a page then no other JavaScript on that page will currently be executed.
JavaScript is only asynchronous in the sense that it can make, for example, Ajax call...
What characters are forbidden in Windows and Linux directory names?
I know that / is illegal in Linux, and the following are illegal in Windows
(I think) * . " / \ [ ] : ; | ,
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Understanding the Gemfile.lock file
After running the bundle install command, 'Gemfile.lock ' is created in the working directory. What do the directives inside that file mean?
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What is a mixin, and why are they useful?
In " Programming Python ", Mark Lutz mentions "mixins". I'm from a C/C++/C# background and I have not heard the term before. What is a mixin?
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