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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...
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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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 can I indent multiple lines in Xcode?
...ll. I come from Eclipse where I always did it that way. How's that done in Xcode? I hope not line by line ;)
20 Answers
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How to download an entire directory and subdirectories using wget?
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Great, so to simplify for the next reader: wget -r -l1 --no-parent http://www.stanford.edu/~boyd/cvxbook/cvxbook_additional_exercises/ was the answer for me. Thanks your answer.
– isomorphismes
Jun 21 '14 at 17:05
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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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sed whole word search and replace
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\b in regular expressions match word boundaries (i.e. the location between the first word character and non-word character):
$ echo "bar embarassment" | sed "s/\bbar\b/no bar/g"
no bar embarassment
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