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Fast check for NaN in NumPy
... to get slower as NaNs get closer to the start of the array. On the other hand, sum's throughput seems constant regardless of whether there are NaNs and where they're located:
In [40]: x = np.random.rand(100000)
In [41]: %timeit np.isnan(np.min(x))
10000 loops, best of 3: 153 us per loop
In [42]:...
Create batches in linq
...ches as entire collections of items (which accumulates the items anyways), and often process batches in parallel (which is not supported by the iterator approach, and will be a nasty surprise unless you know the implementation details).
– Michael Petito
May 19 ...
How to use permission_required decorators on django class-based views
I'm having a bit of trouble understanding how the new CBVs work. My question is this, I need to require login in all the views, and in some of them, specific permissions. In function-based views I do that with @permission_required() and the login_required attribute in the view, but I don't know how ...
Finding the type of an object in C++
I have a class A and another class that inherits from it, B. I am overriding a function that accepts an object of type A as a parameter, so I have to accept an A. However, I later call functions that only B has, so I want to return false and not proceed if the object passed is not of type B.
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Python Create unix timestamp five minutes in the future
...etime.timedelta) didn't mention that shortcut. It only had days, seconds, and microseconds.
– Daniel Rhoden
May 5 '10 at 19:05
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Why can't (or doesn't) the compiler optimize a predictable addition loop into a multiplication?
...th a condition like data[c] & 0x80 or so that can be true for positive and negative values?). I had compilers make invalid optimisations (for example, a couple of years ago, I had an ICC (11.0, iirc) use signed-32-bit-int-to-double conversion in 1.0/n where n was an unsigned int. Was about twice...
Saving images in Python at a very high quality
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If you are using matplotlib and trying to get good figures in a latex document, save as an eps. Specifically, try something like this after running the commands to plot the image:
plt.savefig('destination_path.eps', format='eps')
I have found that ep...
Are nested HTML comments possible?
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Yes, HTML and XML don't allow to nest comments using <!--. What you can do in your own code is define a comment element and ignore it actively during parsing.
– Aaron Digulla
Jan 14 '09 at 14:0...
AddBusinessDays and GetBusinessDays
... For the second one, one solution is to take the difference between date and date+days. This is nice in that it guarantees that the two functions will sync properly, and it removes redundancy.
– Brian
Jun 25 '09 at 16:20
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disable the swipe gesture that opens the navigation drawer in android
I've been following the navigation drawer guide by Google and I'd like to add it to an Activity with tabs and gestures.
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