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Select DISTINCT individual columns in django?
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User order by with that field, and then do distinct.
ProductOrder.objects.order_by('category').values_list('category', flat=True).distinct()
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binning data in python with scipy/numpy
...form operations of this type:
import numpy_indexed as npi
print(npi.group_by(np.digitize(data, bins)).mean(data))
This is essentially the same solution as the one I posted earlier; but now wrapped in a nice interface, with tests and all :)
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Multiline syntax for piping a heredoc; is this portable?
...ine_list
| /* empty */
So a pipe symbol can be followed by an end-of-line and still be considered part of a pipeline.
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Where to place the 'assets' folder in Android Studio?
...g to include a custom font in the assets directory. Should I be good to go by just pasting the .ttf file as src/main/assets/font.ttf ? or do i need to assign the font explicitly by code to the control to see it?
– kalehv
Aug 18 '13 at 19:06
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Do event handlers stop garbage collection from occurring?
...n the instance of your class goes out of scope, it is no longer referenced by your program. It is no longer used and therefore can be safely collected.
If you are not sure wether something will get collected ask yourself the following question: does there still exist a reference to it? The event ha...
What does Bump Version stand for?
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This article describes a fantastic way to work with git, by the way. Very organized and streamlined. I recommend to everyone.
– pilau
Feb 3 '13 at 9:02
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Git fetch remote branch
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I have used fetch followed by checkout...
git fetch <remote> <rbranch>:<lbranch>
git checkout <lbranch>
...where <rbranch> is the remote branch or source ref and <lbranch> is the as yet non-existent local branch o...
How does C compute sin() and other math functions?
...ry of sysdeps.
One directory includes an implementation in C, contributed by IBM. Since October 2011, this is the code that actually runs when you call sin() on a typical x86-64 Linux system. It is apparently faster than the fsin assembly instruction. Source code: sysdeps/ieee754/dbl-64/s_sin.c, lo...
String, StringBuffer, and StringBuilder
...advised at all, since the JVM converts the String to a StringBuffer in the bytecode. A lot of overhead is wasted converting from String to StringBuffer and then back to String again.
– Pieter van Niekerk
Jun 4 '10 at 8:28
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Setting background colour of Android layout element
...is somewhat lacking when it comes to some features. I think I picked it up by accident in some external tutorials. Usually it's a good idea to browse the api samples and sample projects though. You can find the code inside the ANDROID_SDK\samples folder (for various android versions). The whole api ...