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python numpy ValueError: operands could not be broadcast together with shapes
...mpatible when:
they are equal, or
one of them is 1
In other words, if you are trying to multiply two matrices (in the linear algebra sense) then you want X.dot(y) but if you are trying to broadcast scalars from matrix y onto X then you need to perform X * y.T.
Example:
>>>...
How to avoid having class data shared among instances?
...t, so do not get bound up in the semantics of other languages usage of the word class. In python, a class is really just an object that is used to determine how to create other objects and what their behaviors will be. Metaclasses are classes that create classes, just to further illustrate this po...
Was PreferenceFragment intentionally excluded from the compatibility package?
... so). In fact that's what the "easily" recommendation has done. In other words, if you want to use PreferenceFragment your app needs to use the built-in fragment API and deal with the deprecated methods on PreferenceActivity. Conversely, if it's important that your app use the compat. API you wil...
Difference between wait() and sleep()
...n the definitions from the Javadoc and also the meaning of the two english words but I do not see Why I should ever use sleep instead of wait? What is the benchmarking and speed difference between the two? If I can do everything that I can do with sleep why should I ever choose sleep?
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Package objects
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Word of caution: method overloading doesn't work in package objects.
– retronym
Aug 4 '10 at 5:20
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Why does Python use 'magic methods'?
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Python uses the word "magic methods", because those methods really performs magic for you program. One of the biggest advantages of using Python's magic methods is that they provide a simple way to make objects behave like built-in types. Th...
Why is JSHINT complaining that this is a strict violation?
...just something programmers usually do this way to convey meaning. In other words: this is not a technological problem, but one of communication between homans.
– amenthes
Apr 28 '17 at 8:05
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How can I test a Windows DLL file to determine if it is 32 bit or 64 bit? [duplicate]
...02 characteristics
Executable
32 bit word machine
DLL
OPTIONAL HEADER VALUES
10B magic # (PE32)
You can see a couple clues in that output that it is a 32 bit DLL, including the 14C value that Paul mentions. Should be easy to l...
How would I get a cron job to run every 30 minutes?
...run your_command in the minutes that are dividable by 5 or in the simpler words, '0,5,10,...'
So, dividable symbol '/' is the best choice always;
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What does the question mark in Java generics' type parameter mean?
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? extends HasWord
means "A class/interface that extends HasWord." In other words, HasWord itself or any of its children... basically anything that would work with instanceof HasWord plus null.
In more technical terms, ? extends HasWor...