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How to access the ith column of a NumPy multidimensional array?
...vered in Section 1.4 (Indexing) of the NumPy reference. This is quick, at least in my experience. It's certainly much quicker than accessing each element in a loop.
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MySQL error 1449: The user specified as a definer does not exist
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In addition you will need to grant at least the SELECT and EXECUTE privileges to the added user. I ran into this when I exported a DB backup from one server to another where the user that created the routines didn't exist on the test server.
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How do I log a Python error with debug information?
...ly don't want to type a message... the function can't be called without at least one argument, though, so you'll have to give it something.
– ArtOfWarfare
Jun 10 '18 at 3:00
a...
Dynamically updating plot in matplotlib
... plots at the same time), calling draw alone does not produce the plot (at least with the qt backend).
The following works for me:
import matplotlib.pyplot as plt
plt.ion()
class DynamicUpdate():
#Suppose we know the x range
min_x = 0
max_x = 10
def on_launch(self):
#Set u...
Long vs Integer, long vs int, what to use and when?
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a) object Class "Long" versus primitive type "long". (At least in Java)
b) There are different (even unclear) memory-sizes of the primitive types:
Java - all clear: https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html
byte, char .. 1B .. 8b
short int .. 2B ....
“register” keyword in C?
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It hasn't been relevant for at least 15 years as optimizers make better decisions about this than you can. Even when it was relevant, it made a lot more sense on a CPU architecture with a lot of registers, like SPARC or M68000 than it did on Intel with it...
How to center a subview of UIView
...er view with autolayout you can use same code for any two views sharing at least one parent view.
First of all disable child views autoresizing
UIView *view1, *view2;
[childview setTranslatesAutoresizingMaskIntoConstraints:NO];
If you are UIView+Autolayout or Purelayout:
[view1 autoAlignAxis...
Visibility of global variables in imported modules
... really do need it. (And if you need more details, search SO; there are at least two questions on how to add stuff to builtins properly.) But, as Bi Rico says, you almost certainly don't really need it, or want it.
– abarnert
Apr 11 '13 at 22:55
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How do I upgrade PHP in Mac OS X?
...ms to work A-OK). I searched high and low for days trying to update (or at least get Apache to point to) a new version of PHP. My mcrypt did not work, along with other extensions and I installed and reinstalled PHP countless times from http://php-osx.liip.ch/ and other tutorials until I finally noti...
Format floats with standard json module
... As others have pointed out, this is no longer working in at least Python 3.6+. Add a few digits to 23.67 to see how .2f is not respected.
– Nico Schlömer
Jun 5 '18 at 13:18
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