When you declare a function parameter as an array, the compiler automatically ignores the array size (if any) and converts it to a pointer. That is, this declaration: int foo(char p[123]); is 100% equivalent to: int foo(char *p); In fact, this isn’t about notation but about the actual type: typedef char array_t[42]; int foo(array_t p); … Read more
Range takes, 1, 2, or 3 arguments. This could be implemented with def range(*args), and explicit code to raise an exception when it gets 0 or more than 3 arguments. It couldn’t be implemented with default arguments because you can’t have a non-default after a default, e.g. def range(start=0, stop, step=1). This is essentially because … Read more
Yes, you can do it. If you want to call all functions in the list with a “one liner” you can do the following: results = [f() for f in options]
The short answer is that the C++11 specification requires your A to be CopyConstructible to be used with std::function. The long answer is this requirement exists because std::function erases the type of your functor within the constructor. To do this, std::function must access certain members of your functor via virtual functions. These include the call … Read more
You can’t run PHP code with Javascript. When the user recieves the page, the server will have evaluated and run all PHP code, and taken it out. So for example, this will work: alert( <?php echo “\”Hello\””; ?> ); Because server will have evaluated it to this: alert(“Hello”); However, you can’t perform any operations in … Read more
Declaring a function with a variable but arbitrary name like this is not possible without getting your hands dirty with eval() or include(). I think based on what you’re trying to do, you’ll want to store an anonymous function in that variable instead (use create_function() if you’re not on PHP 5.3+): $variableA = function() { … Read more
Firefox interprets function statements differently and apparently they broke declaration hoisting for the function declaration. ( A good read about named functions / declaration vs expression ) Why does Firefox interpret statements differently is because of the following code: if ( true ) { function test(){alert(“YAY”);} } else { function test(){alert(“FAIL”);} } test(); // should … Read more
With default parameter values added in ES2015, you can declare default values for the parameters, and when making the call, if you pass undefined as the first parameter, it will get the default: function test(a = “ay”, b = “bee”) { console.log(`a = ${a}, b = ${b}`); } test(); // “a = ay, b = … Read more
It’s all because OpenCV uses Automatic Memory Management. OpenCV handles all the memory automatically. First of all, std::vector, Mat, and other data structures used by the functions and methods have destructors that deallocate the underlying memory buffers when needed. This means that the destructors do not always deallocate the buffers as in case of Mat. … Read more
The short answer is that G is maintained by the optimizer as part of the minimization process, while the (D_neg, D, and C) arguments are passed in as-is from the args tuple. By default, scipy.optimize.minimize takes a function fun(x) that accepts one argument x (which might be an array or the like) and returns a … Read more