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What does -1 mean in numpy reshape?
... (-1,3) but not (-1, -1)). It simply means that it is an unknown dimension and we want numpy to figure it out. And numpy will figure this by looking at the 'length of the array and remaining dimensions' and making sure it satisfies the above mentioned criteria
Now see the example.
z = np.array([[...
Is UML practical? [closed]
In college I've had numerous design and UML oriented courses, and I recognize that UML can be used to benefit a software project, especially use-case mapping, but is it really practical? I've done a few co-op work terms, and it appears that UML is not used heavily in the industry. Is it worth ...
How to define a reply-to address?
...
Solution for Rails 5.2 and possibly older/newer versions:
Amend the file:
config/environments/development.rb
With content:
Rails.application.configure do
config.action_mailer.default_options = {
reply_to: 'test@example.com'...
How do I convert a string to a double in Python?
...float(x)
2342.3400000000001
There you go. Use float (which behaves like and has the same precision as a C,C++, or Java double).
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Detecting Unsaved Changes
...pt in an ASP .Net application. If a user modifies controls on a web form, and attempts to navigate away before saving, a prompt should appear warning them that they have unsaved changes, and give them the option to cancel and stay on the current page. The prompt should not display if the user hasn...
Objective-C: Property / instance variable in category
...a single storage slot. So if you wanted to use this on multiple instances and have each instance compute a distinct value, it wouldn't work.
Fortunately, the Objective-C runtime has this thing called Associated Objects that can do exactly what you're wanting:
#import <objc/runtime.h>
stati...
How can I convert byte size into a human-readable format in Java?
...osted here was the most copied Java snippet of all time on Stack Overflow, and it was flawed. It was fixed, but it got messy.
Full story in this article: The most copied Stack Overflow snippet of all time is flawed!
Source: Formatting byte size to human readable format | Programming.Guide
SI (1 k =...
Entity Framework: table without primary key
...t to. The number of confusing bugs that could be introduced is staggering and scary, not to mention the fact that your performance will likely go down the tubes.
Don't work around this. Fix your data model.
EDIT: I've seen that a number of people are downvoting this question. That's fine, I sup...
Java synchronized method lock on object, or method?
...s, you have synchronize on them separately in synchronized () blocks. If a and b were object references you would use:
public void addA() {
synchronized( a ) {
a++;
}
}
public void addB() {
synchronized( b ) {
b++;
}
}
But since they're primitives you can't do thi...
How do I maintain the Immersive Mode in Dialogs?
... even if you set the UI visibility before adding it to the manager. In the Android Immersive example it's commented that:
// * Uses semi-transparent bars for the nav and status bars
// * This UI flag will *not* be cleared when the user interacts with the UI.
// When the user swipes, the bars will t...