function

问题 I'm mostly a c/C++/objective-C programmer, presently working in Java on an android application. My question is simple: I want a utility function, preferably not associated with any class that I can invoke from anywhere in my project (#include of some sort necessary?). I know I can make a public static function of a class and invoke it as Class.someFunction(); . I would like to just have someFunction(); I'm not sure if this is possible in java, or what the syntax for it is. 回答1: You can

问题 I've defined a bunch of custom functions and find a lot of them include some identical or similar blocks of code (e.g. just including slightly different strings or arguments). So something like: def func1(a, b, c): some_identical_code some_similar_code more_identical_code some_unique_code final_similar_code # similarly for func2, func3... I would like to try to combine these into a single function that takes an additional 'setting' argument, both because the functions are obviously related

问题 To obtain absolute deviation from the mean for two groups of scores, I usually need to write long codes in R such as the ones shown below. Question I was wondering if it might be possible in BASE R to somehow Vectorize the mad() function so that the absolute deviation from the mean scores for each group of scores in the example I'm showing below could be obtained using that Vectorized version of mad() ? Any other workable ideas are highly appreciated? set.seed(0) y = as.vector(unlist(mapply

问题 I have a function and I would like to find its maximum and minimum values. My function is this: def function(x, y): exp = (math.pow(x, 2) + math.pow(y, 2)) * -1 return math.exp(exp) * math.cos(x * y) * math.sin(x * y) I have an interval for x [-1, 1] and y [-1, 1]. I would like to find a way, limited to this interval, to discover the max and min values of this function. 回答1: Using, for instance, scipy 's fmin (which contains an implementation of the Nelder-Mead algorithm), you can try this:

问题 I created custom function OutputMessage from where i'm inserting error message with its ClassStyle like this Error: image upload failed! and then i'm exploding string and split class from it add in to div class but my function is not working fine. function OutputMessage($Message=''){ if($Message){ $Postion = strpos($Message,":"); if($Postion !== TRUE){ return sprintf('<div class="alert alert-default">%s</div>',$Message); }else{ $Message = explode(": ",$Message); return sprintf('<div class=

问题 So I have a button (called here "LeftArrow") and a counter label (called here "lbl") (they are not connected to each other in any way). The counter is working by those codes : <script> function check() { document.getElementById("UpdatePlayersInPartyBTN").click(); } setInterval(check, 1000); </script> There is this button that occurs the code-behind by the JS function : <button runat="server" id="UpdatePlayersInPartyBTN" onserverclick="UpdatePlayersInParty" hidden="hidden"> </button> And the

问题 I am trying to write a recursive C function which would solve the tower of Hanoi , but with an extra restriction , that moving a disc from A (the source tower) to C (the destination tower) is forbidden , and vice versa. For instance , moving a single disc from A to C or C to A , would require using the auxiliary tower (B). I found a normal recursive Hanoi tower code from geeksforgeeks and checked a CS page which discussed the same problem , but I cant understand the mathematical algorithm

问题 I am trying to create a dynamic url in javascript to pass to my html template. In my js, I've got: // dynamic url to edit flashcard function createDynamicURL() { //The variable to be returned var URL; //The variables containing the respective IDs var cardID= cards.cards[current_card].id //this is defined earlier //Forming the variable to return URL-="study/[1-9][0-9]/"; URL+="card-edit/"; URL+=cardID; return URL; } And in my template I have: <a id="edit-button" class="btn btn-default btn

问题 new to Dart here, sorry in advance if this is a redundant question; I couldn't find the answer. I created a function simulateRequest and then passed it to its own class SimReq and saved it in a file on its own. I imported the class in the main file, but when I try to execute it, I get an error, here is the class code: class SimReq { void simulateRequest() async { // first future holds family name String famNameFunc = await Future.delayed(Duration(seconds: 2), (){ String famName = 'Shanshi';

问题 I am pretty competent with Python, but I'm pretty new to C++ and things like pointers. I try to write some codes for solving ODE with the Eigen package for linear algebra (I will need to deal with lots of matrices later, so I plan to start with it). I have the following code for RK4 and they work: #include "../eigen-eigen-b3f3d4950030/Eigen/Dense" using namespace Eigen; VectorXd Func(const VectorXd& a) { // equations for solving simple harmonic oscillator Vector2d ans; ans(0) = a(1); // dy/dt