simulation

问题 I create a box2d world, put some objects on the screen with different properties like rotation, restitution ,density. And then I start the application. Is it possible to fast forward the simulation so that I can see the result quickly? By result I mean the final state of the world objects. Just like a video clip. 回答1: Thanks to Andrew I found that if I run the Step function multiple times, I can get the fast forwarded simulation. Here's just a little code that I guess anybody could write: -

问题 I'm trying to write a code for 3-body problem with leapfrog algorithm. I'm using "Moving Stars Around" by Piet Hut & Jun Makino as a guide. The codes in the guide are written in C, but I'm trying to follow the exact workflow using Python as a start before experimenting with it. The following is my attempt to follow the code from section 5.1. import numpy as np N = 3 #number of bodies m = 1 #mass dt = 0.01 #timestep t_end = 10 #duration r = [] v = [] a = [[0, 0, 0] for i in range(N)] for i in

问题 Does the Android API expose facilities for generating touch events, for example, repeatedly simulating different gestures on the screen for testing? 回答1: Doesn adb commands will work for u or u need some kind of monkay testing tool commands ??? For adb commands u can use below shell commands... adb shell input tap x y and also adb shell sendevent /dev/input/event0 3 0 5 adb shell sendevent /dev/input/event0 3 1 29 adb shell sendevent /dev/input/event0 1 330 1 adb shell sendevent /dev/input

问题 How can I simulate the mouse click in a directx application? mouse_event and PostMessage with WM_LBUTTONDOWN don't work... so it must be something to do with the DirectInput I haven't found out nothing useful with google, so you may be knowing the answer... thanks in advance //update I wrote the text wrongly, what I want is to make the directx app believe that the mouse has just clicked, but without effectively using the mouse and without using SendInput or mouse_event, which need that the

问题 I'm using the ANSYS Fluent program for CFD simulations. This program allows some partial automation of the simulation setup using a so-called Journal File, and I just came to know that this Journal File is written in Scheme. Unfortunately I never even heard of Scheme, I just know it's a Lisp dialect (which I also know nothing of). I'm trying to automate some boring tasks by using a loop to automatically set a bunch of parameters to my simulation. If I run this command from Fluent's command

问题 A sequel to my previous question: I'm using the ANSYS Fluent program for CFD simulations. This program allows some partial automation of the simulation setup using a so-called Journal File, and I just came to know that this Journal File is written in Scheme. Unfortunately I never even heard of Scheme, I just know it's a Lisp dialect (which I also know nothing of). I'm trying to automate some boring tasks by using a loop to automatically set a bunch of parameters to my simulation. If I run

问题 my code for the design block and the testbench compiles, however when i simulate i'm not getting the correct output. Can anyone tell me where i'm going wrong in my code? Here is the code for testbench: module testbench; reg [511:0]FROM_LS; reg CLK; reg [63:0]TO_IF_ID; initial begin CLK= 0; TO_IF_ID[63:0]=63'b0; FROM_LS[511:480]= 32'b00011_00000_00100_01100_11100_10111_01; FROM_LS[479:448]=32'b00_11000_00100_01111_11111_00011_10000; end always begin #10 CLK= ~ CLK; //FROM_LS[511:448]= ~ FROM

问题 Hi I'm writing a project in omnet, but I'm stuck on defining my own module. On https://github.com/lbedogni/Basic-Broadcast-Simulation there is the full code. The problem is that i get the following error message: <!> Error in module (cCompoundModule) scenario.host[0] (id=4) at event \#1, t=0: Class "basic::Flooding" not found -- perhaps its code was not linked in, or the class wasn't registered with Register_Class(), or in the case of modules and channels, with Define_Module()/Define_Channel(

问题 In my model I use direct links to keep interaction value of each turtle to other turtles and each link has a different value for each end of the links which is exactly what I want and it was really easy to implement, However, I have a performance issue and my model is not working as fast as I think it should work. Now I am trying different methods to decrease the computation needs. One of the things that crossed my mind is to integrate all directed links to undirected links and put the value

问题 This is an example (pseudo code) of how you could simulate and render a video game. //simulate 20ms into the future const long delta = 20; long simulationTime = 0; while(true) { while(simulationTime < GetMilliSeconds()) //GetMilliSeconds = Wall Clock Time { //the frame we simulated is still in the past input = GetUserlnput(); UpdateSimulation(delta, input); //we are trying to catch up and eventually pass the wall clock time simulationTime += delta; } //since my current simulation is in the