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how does multiplication differ for NumPy Matrix vs Array classes?
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the key things to know for operations on NumPy arrays versus operations on NumPy matrices are:
NumPy matrix is a subclass of NumPy array
NumPy array operations are element-wise (once broadcasting is accounted for)
NumPy matrix operations foll...
Accessing an SQLite Database in Swift
...you should probably use one of the many SQLite wrappers, if you wanted to know how to call the SQLite library yourself, you would:
Configure your Swift project to handle SQLite C calls. If using Xcode 9 or later, you can simply do:
import SQLite3
Create/open database.
let fileURL = try! FileMan...
What's the meaning of interface{}?
...rything has a Type. You can define a new type, let's call it T. Let's say now our Type T has 3 methods: A, B, C.
The set of methods specified for a type is called the "interface type". Let's call it in our example: T_interface. Is equal to T_interface = (A, B, C)
You can create an "interface type" ...
Find the Smallest Integer Not in a List
...wo linear passes through the list, or just one pass if the list length is known to start with. There is no need to represent the hold the entire list in memory, so the algorithm's asymptotic memory usage is just what is needed to represent the array of booleans; i.e. O(N) bits.
(By contrast, algor...
What are advantages of Artificial Neural Networks over Support Vector Machines? [closed]
...computer vision when a raw image is provided to the learning algorithm and now Sophisticated features are calculated.
Essentially the intermediate levels can calculate new unknown features.
share
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Convert a series of parent-child relationships into a hierarchical tree?
...dilemma" for outputting an array. The dilemma is, that each item does not know whether or not children will follow up or how many preceding elements need to be closed. In another answer I already solved that by using a RecursiveIteratorIterator and looking for getDepth() and other meta-information t...
Creating C formatted strings (not printing them)
...ad written
char s[42];
you would be in deep trouble, because you can't know what number to put into the brackets.
Even if you had used the "safe" variant snprintf(), you would still run the danger that your strings gets truncated. When writing to a log file, that is a relatively minor concern, bu...
How do I get the SharedPreferences from a PreferenceActivity in Android?
...me reading some stupid nerds answers/comments all over SE, who think they know when they actually don't.. Thanks @Pentium10, do you own any blog, thanks again, really appreciate it :)
– Sanjeevcn
Mar 14 '15 at 6:55
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How to implement custom JsonConverter in JSON.NET to deserialize a List of base class objects?
...his function would be maintained in the Newtonsoft library itself, but for now, you can use the following:
/// <summary>Creates a new reader for the specified jObject by copying the settings
/// from an existing reader.</summary>
/// <param name="reader">The reader whose settings ...
In PHP with PDO, how to check the final SQL parametrized query? [duplicate]
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Accepting this for now as it makes sense. It's not very convenient for debugging then...
– JB Hurteaux
Nov 23 '09 at 22:32
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