## Overview

Обзор

In [2]:
var iframer = require('./iframer')


StatSim is a multipurpose app. It wraps WebPPL, a probabilistic programming language, in a user-friendly graphical interface based on Vue.js and a couple of additional libraries. StatSim can be used to create basic programs, however its main purpose is probabilistic simulations and modeling.

Let's open a simple example that just sums two variables x and y and displays results:

In [3]:
iframer('https://statsim.com/app/?a=%5B%7B%22b%22%3A%5B%7B%22n%22%3A%22x%22%2C%22sh%22%3Afalse%2C%22t%22%3A2%2C%22u%22%3Atrue%2C%22dims%22%3A%22%22%2C%22v%22%3A%222%22%7D%2C%7B%22n%22%3A%22y%22%2C%22sh%22%3Afalse%2C%22t%22%3A2%2C%22u%22%3Atrue%2C%22dims%22%3A%22%22%2C%22v%22%3A%223%22%7D%2C%7B%22n%22%3A%22z%22%2C%22h%22%3Afalse%2C%22sh%22%3Atrue%2C%22t%22%3A1%2C%22v%22%3A%22x%2By%22%7D%5D%2C%22mod%22%3A%7B%22n%22%3A%22Sum%22%2C%22e%22%3A%22%22%2C%22s%22%3A1%2C%22m%22%3A%22deterministic%22%7D%2C%22met%22%3A%7B%22sm%22%3A1000%7D%7D%5D')

Out[3]:

There are 2 key areas of the StatSim window: block stack on the left and preview with results on the right. To actually build a model use the left part. Each model (program) consists of building blocks. Our new simple program just sums two variables and displays results. What we need is two data blocks for each input variable and one expression block that describes a formula: x + y.

Data blocks can be used as inner, hidden constants or model inputs (model parameters). That determines if the corresponding input element is shown in preview mode and when compiled to system binaries.

In [5]:
iframer('http://statsim.com/app/?a=%5B%7B%22b%22%3A%5B%7B%22i%22%3A%22800%22%2C%22h%22%3Atrue%2C%22n%22%3A%22Prey%22%2C%22sh%22%3Atrue%2C%22t%22%3A3%2C%22v%22%3A%22Prey%20%2A%20PreyGrowthRate%20%20-%20Predator%20%2A%20ConsumeRate%20%2A%20Prey%22%7D%2C%7B%22i%22%3A%22100%22%2C%22h%22%3Atrue%2C%22n%22%3A%22Predator%22%2C%22sh%22%3Atrue%2C%22t%22%3A3%2C%22v%22%3A%22PredatorIncreaseRate%20%2A%20Prey%20%2A%20Predator%20-%20PredatorDeathRate%20%2A%20Predator%22%7D%2C%7B%22f%22%3Anull%2C%22n%22%3A%22PreyGrowthRate%22%2C%22sh%22%3Afalse%2C%22t%22%3A2%2C%22u%22%3Afalse%2C%22v%22%3A%220.049%22%7D%2C%7B%22f%22%3Anull%2C%22n%22%3A%22ConsumeRate%22%2C%22sh%22%3Afalse%2C%22t%22%3A2%2C%22u%22%3Afalse%2C%22v%22%3A%220.00027%22%7D%2C%7B%22f%22%3Anull%2C%22n%22%3A%22PredatorDeathRate%22%2C%22sh%22%3Afalse%2C%22t%22%3A2%2C%22u%22%3Afalse%2C%22v%22%3A%220.047%22%7D%2C%7B%22f%22%3Anull%2C%22n%22%3A%22PredatorIncreaseRate%22%2C%22sh%22%3Afalse%2C%22t%22%3A2%2C%22u%22%3Afalse%2C%22v%22%3A%220.0001%22%7D%5D%2C%22mod%22%3A%7B%22n%22%3A%22PredatorPrey%22%2C%22e%22%3A%22Simulation%20of%20predator-prey%20model%20using%20Lotka-Voltera%20equations.%22%2C%22s%22%3A%22700%22%2C%22m%22%3A%22deterministic%22%7D%2C%22met%22%3A%7B%22sm%22%3A%22%22%7D%7D%5D')

Out[5]:
By Антон Землянский in