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Questions tagged [simulation]

Simulation is the imitation of some real thing, state of affairs, or process. The act of simulating something generally entails representing certain key characteristics or behaviours of a selected physical or abstract system.

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Spatial parametric scaling in agent-based model

I’m running a simple agent-based disease spread model on a 2D lattice, where disease transmission in a population depends on each individual’s chance of avoiding infection at every time step, which ...
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2answers
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Quite-Off-The-Bat Complex Console Ant Colony Simulator w/ Partial AI

As a follow-up of my previous non-off-the-bat Ant Colony Simulator, we have this one that works off-the-bat... quite; the code for when the ants find and take the food isn't really done but it would ...
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Ant Colony Simulator

This program is a simulation of an ant colony, inspired by SimAnt. It doesn't do it off the batch; there must be code that instructs the ants to follow scent tiles in particular and react to the food. ...
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1answer
544 views

Velocity verlet implementation

My code is meant to update the positions and velocities of planets. There are a few methods in this class, but updatePosition and ...
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0answers
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Fluid Simulation with SDL

I have always wanted to write a fluid simulation, and with the help of a paper and some StackOverflow users I've got something that works. My goal is to have a program that someone can run right away ...
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1answer
718 views

War Card Game Simulator

This is the second thing I've ever written in Python. I am just looking for what I could improve upon along with things that could be done better. It is as compact as I could make it with my current ...
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1answer
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MAC1 simulator/debugger

In constructing an answer to this question, I wrote a small debugger/simulator for the MAC-1 instruction set. There are a number of simulators already out there, but most are either too old to be ...
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2answers
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How Long Will Your Smartphone Distract You From Family Dinner?

I wrote a program to simulate this week's 538 Riddler, reproduced below: You’ve just finished unwrapping your holiday presents. You and your sister got brand-new smartphones, opening them at the ...
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1answer
949 views

Discrete event simulation of a prioritized lunch queue

Note This post is a continuation of Discrete event simulation of a prioritized lunch queue in Java (Data structures). Please refer to it for problem description. This part about "algorithms": all ...
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1answer
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Discrete event simulation of a prioritized lunch queue in Java (Data structures)

(See also the Algorithms part.) Post details The program I am putting for being reviewed does not fit entirely in a single post, so I have to resort to the equation by Niklaus Wirth: Algorithms + ...
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Solar System model

I have a model that works, as far as I know, but it's so messy! I am very new to Java, so I'd really appreciate some help tidying up. In particular, a lot of my constructors are empty which is ...
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Orbital Trajectory simulator

I have written a simple program to do trajectory simulation in the Earth-Moon system, it still has a long way to go I am working on making it more class oriented and am looking into implementing a ...
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4answers
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Ising Model - Atom Vibration Simulation in Scala

I am an experienced Java developer (12+ years) and have recently switched to Scala and I love it. However I feel not comfy yet and I have a feeling that I might use to many paradigms from the good old ...
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2answers
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Python object-oriented pipe cooling simulations

Here is my code simulating liquid in a pipe cooling under different conditions. How did I do approaching this in an object orientated way? Is there any way I can improve this code? ...
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1answer
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Airport Simulator [closed]

I tried this program in both Orwell DevC++ and Visual Studio 2013 (program works correctly). My astonishment is the performance of the same program in both IDEs. While the former took only 395 ...
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Three-number lottery simulator

Please let me know how I can make it better, especially with avoiding repetition without the need to replace the user guesses. ...
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3answers
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Genetic Drift Simulator - Follow Up

This question is a follow-up of a previous question of mine: Genetic Drift Simulator. Following the advice given in the last question, and some more general improvements, the code has been slimmed ...
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2answers
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Genetic Drift simulator

Genetic drift — along with natural selection, mutation, and migration — is one of the basic mechanisms of evolution. In each generation, some individuals may, just by chance, leave behind a few ...
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2answers
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Generating a PANDAS DataFrame of simulated coin tosses

It's taking my machine quite a long time to execute 1 billion (1st loop x 10, 2nd loop x 1000, 3rd loop x 100,000) instructions. Suggestions for performance enhancements? Sources of potential concern: ...
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2answers
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Simulation of 2 dice rolls

I wrote a program that records how many times 2 fair dice need to be rolled to match the probabilities for each result that we should expect. I think it works but I'm wondering if there's a more ...
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1answer
163 views

Java “pulse” between threads

I have two threads. One runs a simulation and one runs a UI. In the UI, it is possible to trigger a "tick" of the simulation. There are a few constraints: Ticks run on the simulation thread Each ...
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1answer
2k views

Bean Machine Simulation

I could not find a solution from my book's website (student-level access) but I feel that I am missing something that I'm supposed to learn from this exercise. Instructions: Balls are dropped from ...
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3answers
7k views

Slot Machine in Python

I have made this little program which allows you to play a slot machine: ...
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1answer
981 views

Poker probabilities finder

This code finds the probabilities of the various scores in Poker. It uses a Monte Carlo approach, in which, two million (\$2 \times 10^{6}\$) hands are simulated and evaluated, not an exhaustive ...
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4answers
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Buffon's Needle experiment

I was working on a program that simulates the Buffon's Needle experiment. If anyone is not familiar with it, a Wiki link is provided - Buffons's Needle The point of Buffon's experiment is to find ...
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2answers
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2D physics game engine

I'm writing a 2D game engine, and I just wrote the physics for it to handle collisions between AABBs and circles. It's on GitHub. Some of my worries are that my code isn't OOP, because I have to do ...
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2answers
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Get neighbour sides of a Rubics cube

I'm writing 2x2x2 rubics cube simulator. In my code I have a concept of Face which is individual side of the cube, and State which is agregate of all six sides. When I create new State, in addition to ...
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1answer
293 views

N-body sim with Barnes-Hut - Follow up

Link to previous question: Barnes-Hut N-body simulator It still has issues I'm sure. Node.h ...
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2answers
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Barnes-Hut N-body simulator

I've written an n-body simulator, implementing the Barnes-Hut algorithm. Please comment on anything you can see wrong with this. Wikipedia Barnes-Hut page This is a screen shot of the simulation 20 ...
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WaTor Code in Java

I just coded a version of WaTor, a population simulation game in which fish and sharks move around, breed, and eat each other. I am wondering how I did and if there are better ways to do some of the ...
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2answers
507 views

Computation of population patterns in simple agent-based model

I've modeled the population changes for a group of agents that inhabit a 2D lattice (with wrapped boundaries) made up of M x M number of grids. At each time step: ...
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1answer
96 views

C++ port of my Ruby narcotic solitaire simulator

Having undergone a little "rediscovery" of C++, I decided to port my Ruby narcotic solitaire simulator program to it. My goal here is efficiency. This program is already about 5 times faster than the ...
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4answers
6k views

Brute Force N Body Implementation in C++

I have wrote the following code in C++ for the n-body problem. This code is sequential as later on I am planning to parallelize it using OpenMP. I want to know whether I have wrote the correct ...
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1answer
498 views

Ad hoc implementation of cruise control

I've written a small C program that has ad hoc implementation of cruise control for my Altera DE2 FPGA. It works alright but there are too many global variables. Preferably there should be no global ...
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1answer
1k views

Monte Carlo asset price simulation

I'm trying to write a simplistic Monte Carlo simulator to predict asset prices. For example, if something has an initial value of 50 and an historic daily standard deviation of 2, what are the odds it ...
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1answer
1k views

Modified Coupon Collector's Problem in Java

What is Coupon Collector's Problem? In probability theory, the coupon collector's problem describes the "collect all coupons and win" contests. It asks the following question: Suppose that there is ...
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2answers
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Mini console based life simulation thing

I made this mini life simulation thing. I got the idea from the Eloquent JavaScript textbook, and just kinda ran with it. I've been programming for a little less than year and this is probably the ...
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2answers
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5 Customers, but only 1 Bank Teller

Recently, as part of an interview, I was given a (seemingly) simple code prompt: To simulate a Bank with 5 customers and one teller, allowing them to deposit to and withdraw from their accounts, but ...
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1answer
84 views

Simulating a GUI windowing system - follow-up

The previous and initial iteration at Simulating a GUI windowing system I have essentially cleaned the code based on the only answer. Now I have: MyCanvas.java: ...
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1answer
652 views

Lattice lotka-volterra

Can anyone comment on the efficiency of my code? I am new with Python using NumPy/SciPy and I am trying to program a lattice biological model where a certain (one and only one) species (represented by ...
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7answers
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Monty Hall Paradox in Java

I was wondering if this code looks neat, and if I should change anything. I was planning to implement Frames (or JFrame) tomorrow on it. Would it be a good idea to ...
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5answers
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Designing a coffee machine

I was recently rejected from what looked like a really promising string of interviews. I did very well in a questionnaire style review, and then they handed me this assignment (more or less): ...
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2answers
3k views

Predator Prey Simulation

Below is a simple random walk predator prey simulation that is optimized to the best of my abilities. I would love to hear about any improvements that can made. ...
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1answer
3k views

Particle class for physics simulation

This is a very lengthy class called Particle, it relies on two other headers, one of them is a simple struct which contains an x and y (...
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1answer
3k views

Memory Segmentation Simulation

I recently have been working on a project to simulate segmentation in memory. I wanted to create everything from scratch; not use pre-built data structures. I create a memory object that allows for "...
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0answers
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DP algorithm to find minimum average wait for customer-serving system

Below is the code to find the minimum average waiting time for customers at a store. I want improve the time complexity of the code. As an overview of the logic, I start from ...
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1answer
106 views

Modeling and plotting neuron responses

I want to assign the row of a matrix the return value of a function, but the only way I can figure out how to do this is with a for-loop. I'm assuming this is bad ...
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1answer
274 views

Ruby program to simulate a game of Narcotic Solitaire

In the game of Narcotic Solitaire, played with a standard 52-card deck, the player deals a row of four cards onto the table, from left to right. If all four cards are of the same value, they are ...
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1answer
96 views

Vectorization for temperature simulation

I'm new to Matlab and I would like to know tips in order to reduce the processing time of such program. The scheme of the actual code is very similar to typical C++ code and I would like to vectorize ...
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1answer
209 views

Individuals reproduce and mutate

How can I improve the performance (in terms of computation time) of this code? ...