大约有 40,000 项符合查询结果（耗时：0.0392秒） [XML]
Declaring variables inside loops, good practice or bad practice?
...se sole purpose is to declare variables which must retain their value from one loop to another. This typically includes the loop counter itself.
{
int i, retainValue;
for (i=0; i<N; i++)
{
int tmpValue;
/* tmpValue is uninitialized */
/* retainValue still has its...
How to parse the AndroidManifest.xml file inside an .apk package
...
Has anyone tried this recently? We are using Android Studio 3.0.1 and recently switched to cmake, and this no longer works. Need to find out if it was AS or our build process change.
– GR Envoy
...
How can the Euclidean distance be calculated with NumPy?
...my matrices have different numbers of rows; trying to subtract them to get one matrix doesn't work
– 3pitt
Jan 15 '18 at 1:29
...
Is it possible to specify your own distance function using scikit-learn K-Means Clustering?
...distance, or a user function.
Comments would be welcome (this has had only one user so far, not enough);
in particular, what are your N, dim, k, metric ?
#!/usr/bin/env python
# kmeans.py using any of the 20-odd metrics in scipy.spatial.distance
# kmeanssample 2 pass, first sample sqrt(N)
from __f...
Why '&&' and not '&'?
...ase.
A similar but simpler example of this is the following code (as mentioned by TJHeuvel):
if(op != null && op.CanExecute())
{
// Do Something
}
CanExecute is only executed if op is not null. If op is null, the first part of the expression (op != null) evaluates to false and the ev...
Sending files using POST with HttpURLConnection
...rs recommend to use the HttpURLConnection class, I was wondering if anyone can provide me with a good example on how to send a bitmap "file" (actually an in-memory stream) via POST to an Apache HTTP server. I'm not interested in cookies or authentication or anything complicated, but I just want ...
How do I modify fields inside the new PostgreSQL JSON datatype?
...e are some jsonb manipulation functionality within PostgreSQL itself (but none for json; casts are required to manipulate json values).
Merging 2 (or more) JSON objects (or concatenating arrays):
SELECT jsonb '{"a":1}' || jsonb '{"b":2}', -- will yield jsonb '{"a":1,"b":2}'
jsonb '["a",1]' ||...
How to remove/ignore :hover css style on touch devices
...lick/tap because then it might stick until the element loses focus. To be honest, I don't know why touch devices feel the need to trigger :hover in first place - but this is reality, so this problem is reality as well.
...
How to filter SQL results in a has-many-through relation
...till wasn't much to separate the different approaches, IMO. Of course, the ones based on relational division could target a base table, giving them the advantage of 'extensibility'.
– onedaywhen
Oct 21 '11 at 7:55
...
What is the difference between Serializable and Externalizable in Java?
...dern JVM.
Also, the built-in Java serialization mechanism isn't the only one, you can get third-party replacements, such as JBoss Serialization, which is considerably quicker, and is a drop-in replacement for the default.
A big downside of Externalizable is that you have to maintain this logic yo...