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How can I check whether a numpy array is empty or not?
... in the array:
import numpy as np
a = np.array([])
if a.size == 0:
# Do something when `a` is empty
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WPF: Setting the Width (and Height) as a Percentage Value
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You can put the textboxes inside a grid to do percentage values on the rows or columns of the grid and let the textboxes auto-fill to their parent cells (as they will by default). Example:
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition W...
Converting array to list in Java
How do I convert an array to a list in Java?
19 Answers
19
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Creating an array of objects in Java
...his is correct.
A[] a = new A[4];
...creates 4 A references, similar to doing this:
A a1;
A a2;
A a3;
A a4;
Now you couldn't do a1.someMethod() without allocating a1 like this:
a1 = new A();
Similarly, with the array you need to do this:
a[0] = new A();
...before using it.
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Object of custom type as dictionary key
What must I do to use my objects of a custom type as keys in a Python dictionary (where I don't want the "object id" to act as the key) , e.g.
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How to create a static library with g++?
...please tell me how to create a static library from a .cpp and a .hpp file? Do I need to create the .o and the .a? I would also like to know how can I compile a static library in and use it in other .cpp code. I have header.cpp , header.hpp . I would like to create header.a . Test the header.a in...
Uses for Optional
... provides a default for the second:
foo("bar", "baz");
foo("bar");
This does have limitations, but it's much nicer than either of the above.
Use cases #3 and #4, having an Optional in a class field or in a data structure, is considered a misuse of the API. First, it goes against the main design ...
Eclipse: enable assertions
I'm running Eclipse Galileo. How do I enable assertions in Eclipse?
5 Answers
5
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Gitignore not working
...ey are already in the repository and you have to remove them. You can just do that with this:
(Remember to commit everything you've changed before you do this.)
git rm -rf --cached .
git add .
This removes all files from the repository and adds them back (this time respecting the rules in your ...
Write to UTF-8 file in Python
I'm really confused with the codecs.open function . When I do:
4 Answers
4
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