methods

问题 Consider the arrays as shown here. I have 3 sets of array: Array 1: C1 C2 C3 1 2 3 9 5 6 Array 2: C2 C3 C4 11 12 13 10 15 16 Array 3: C1 C4 111 112 110 115 I need the output as following, the input I can get any one value for C1, ..., C4 but while joining I need to get correct values and if the value is not there then it should be zero. Expected output: C1 C2 C3 C4 1 2 3 0 9 5 6 0 0 11 12 13 0 10 15 16 111 0 0 112 110 0 0 115 I have written pyspark code but I have hardcoded the value for the

问题 I have an inventory program written to include an array and a method to calculate total cost for all inventory items entered. I now have to include a subclass that overrides the original to include "one unique feature". I created a new file named ItemDetails to set up for the subclasses of the original Item. I need to include one unique feature and calculate the value of the inventory and calculate a 5% restocking fee in this subclass. Do I just transfer some of the relevant lines into the

问题 I have a DLP kit which I need to control via MATLAB using a C++ API. Say, I have functions/methods using C/C++ for {load_data, load_settings,display_data} in a mex file named dlp_controller.cpp/.c. I know I can call dlp_controller(); with MATLAB. Is there a way I can call the method of this mex from MATLAB directly? Say my dlp_controller.cpp mex looks as: class dlp{ ... } dlp::dlp{ ... } dlp::load_data{ ... } dlp::load_settings{ ... } dlp::display_data{ ... } void mexFunction(int nlhs,

问题 I have a DLP kit which I need to control via MATLAB using a C++ API. Say, I have functions/methods using C/C++ for {load_data, load_settings,display_data} in a mex file named dlp_controller.cpp/.c. I know I can call dlp_controller(); with MATLAB. Is there a way I can call the method of this mex from MATLAB directly? Say my dlp_controller.cpp mex looks as: class dlp{ ... } dlp::dlp{ ... } dlp::load_data{ ... } dlp::load_settings{ ... } dlp::display_data{ ... } void mexFunction(int nlhs,

问题 This is where confuses me the most while learning go. We all know that methods on T only affect the copy of T , and methods on *T will affect the actual data on T . Why does methods on T can also be used by *T , but the opposite is not allowed? So,can you give me an example(or reason) on why they do not allow method on *T be used by T ? What is the pros and cons of this design? 回答1: There are many answers here, but non of them answer why this is the case. First lets take the case of you

问题 Hi i want to call a C# method.. I already tryed with webmethod, but in the c# method i will not have acces to textbox or others controls. this is how i done without success.. http://www.singingeels.com/Articles/Using_Page_Methods_in_ASPNET_AJAX.aspx With static works, but i want without static, so i can access to the controls in the aspx and validate the page. how can i do it? 回答1: You can't do this with just a javascript call, you need to postback if you want access to the controls on the

问题 Hi i want to call a C# method.. I already tryed with webmethod, but in the c# method i will not have acces to textbox or others controls. this is how i done without success.. http://www.singingeels.com/Articles/Using_Page_Methods_in_ASPNET_AJAX.aspx With static works, but i want without static, so i can access to the controls in the aspx and validate the page. how can i do it? 回答1: You can't do this with just a javascript call, you need to postback if you want access to the controls on the

问题 I've tried to find a laymans definition of addNotify() but I can't really get any answer using Google. As far as I know, when overriding addNotify() in my class, I should call super.addNotify(); and then do whatever else afterward. My question is, does addNotify() run automatically? What is it's purpose and what happens when I override it and furthermore, why would I ever want to override this method? Thank's. 回答1: My question is, does addNotify() run automatically? Yes. The precise where and

问题 I am very new to python. I was trying to pass value from one method to another within the class. I searched about the issue but i could not get proper solution. Because in my code, "if" is calling class's method "on_any_event" that in return should call my another method "dropbox_fn", which make use of the value from "on_any_event". Will it work, if the "dropbox_fn" method is outside the class? I will illustrate with code. class MyHandler(FileSystemEventHandler): def on_any_event(self, event)

问题 If I have two classes, and one of them has a function that I want to use in my other class, what do I use so that I don't have to rewrite my function? 回答1: There are two options: instanciate an object in your class, then call the desired method on it use @classmethod to turn a function into a class method Example: class A(object): def a1(self): """ This is an instance method. """ print "Hello from an instance of A" @classmethod def a2(cls): """ This a classmethod. """ print "Hello from class