In PHP arrays are assigned by copy, while objects are assigned by reference. This means that: Will yield: Whereas: Yields: You could get confused by intricacies such as ArrayObject, which is an object that acts exactly like an array. Being an object however, it has reference semantics. Edit: @AndrewLarsson raises a point in the comments … Read more
The best place to find answers to general (and somewhat easy questions) such as this is to read up on PHP docs. Specifically in your case you can read more on objects. You can store stdObject and instantiated objects within an array. In fact, there is a process known as ‘hydration‘ which populates the member … Read more
Problem This ArrayIndexOutOfBoundsException: 0 means that the index 0 is not a valid index for your array args[], which in turn means that your array is empty. In this particular case of a main() method, it means that no argument was passed on to your program on the command line. Possible solutions If you’re running … Read more
Knuth left this as an exercise (Vol 3, 5.2.5). There do exist in-place merge sorts. They must be implemented carefully. First, naive in-place merge such as described here isn’t the right solution. It downgrades the performance to O(N2). The idea is to sort part of the array while using the rest as working area for merging. For example … Read more
You want to reshape the array. where -1 infers the size of the new dimension from the size of the input array.
You may want to use clone: or use arraycopy(Object source, int sourcePosition, Object destination, int destinationPosition, int numberOfElements)
You can use an utility function to convert from the familiar hexa string to a byte[]. When used to define a final static constant, the performance cost is irrelevant. Since Java 17 There’s now java.util.HexFormat which lets you do This utility class lets you specify a format which is handy if you find other formats easier to read or when … Read more
The general structure of a basic for statement is: ForInit is the initializer. It is run first to set up variables etc. Expression is a boolean condition to check to see if Statement should be run Statement is the block of code to be run if Expression is true ForUpdate is run after the Statement to e.g. update variables as necessary After ForUpdate has been run, Expression is evaluated … Read more
In C++11, in-class member initializers are allowed, but basically act the same as initializing in a member initialization list. Therefore, the size of the array must be explicitly stated. Stroustrup has a short explanation on his website here. The error message means that you are providing too many items for an array of length 0, … Read more
You need to put the arrays you want to concatenate into a sequence (usually a tuple or list) in the argument. Check the documentation for np.concatenate. Note that the first argument is a sequence (e.g. list, tuple) of arrays. It does not take them as separate arguments. As far as I know, this API is … Read more