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Quick-and-dirty way to ensure only one instance of a shell script is running at a time
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How to add a new row to an empty numpy array
...; arr
array([], shape=(0, 3), dtype=int64)
Then be sure to append along axis 0:
arr = np.append(arr, np.array([[1,2,3]]), axis=0)
arr = np.append(arr, np.array([[4,5,6]]), axis=0)
But, @jonrsharpe is right. In fact, if you're going to be appending in a loop, it would be much faster to append t...
using awk with column value conditions
... from The AWK Programming Language and I have a problem with one of the examples.
6 Answers
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Why is '+' not understood by Python sets?
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I'm not sure it does; "Because it is blue" does not explain "Why is the sky blue?"
– SingleNegationElimination
Oct 8 '11 at 17:20
add a comment
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Understanding ibeacon distancing
...tooth-lowenergy/BLE) can work. Is there any true documentation on how far exactly an ibeacon can measure. Lets say I am 300 feet away...is it possible for an ibeacon to detect this?
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How to write a Unit Test?
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Define the expected and desired output for a normal case, with correct input.
Now, implement the test by declaring a class, name it anything (Usually something like TestAddingModule), and add the testAdd method to it (i.e. like the one ...
How do I export UIImage array as a movie?
... if unsure
3) Write some samples:
// Or you can use AVAssetWriterInputPixelBufferAdaptor.
// That lets you feed the writer input data from a CVPixelBuffer
// that’s quite easy to create from a CGImage.
[writerInput appendSampleBuffer:sampleBuffer];
4) Finish the session:
[writerInput markAsF...
Why doesn't Java Map extend Collection?
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From the Java Collections API Design FAQ:
Why doesn't Map extend Collection?
This was by design. We feel that
mappings are not collections and
collections are not mappings. Thus, it
makes little sense for Map to extend
the Collection interface (or vice
versa).
If ...
How to check whether an object has certain method/property?
...roperty using the dynamic keyword, right? How to check whether the method exist before calling myDynamicObject.DoStuff(), for example?
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Retrieving parameters from a URL
...ike the following, how can I parse the value of the query parameters? For example, in this case I want the value of def .
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