Macro r_gen::sample

macro_rules! sample {
    ($sample_ident:ident $trace_ident:ident $name:expr, $dist:expr) => { ... };
}

The macro that is used for sampling from a distribution.

Example

use r_gen::{sample, r_gen}; 
use r_gen::{simulate, distributions::{Value, Distribution}, trace::{Choicemap, Trace}}; 
use std::rc::Rc;

#[r_gen]
fn my_model(():()) {
    let p = sample!(format!("p"), Distribution::Bernoulli(0.5)); 
    print!("p: {}", p);
}
simulate(&mut my_model, ()); 

Takes the form: identifier, Distribution. The identifier will have the value sampled from the distribution stored in it. It can be used later. p will have type Value.

Example (Store results in an array)

use r_gen::{sample, r_gen}; 
use r_gen::{simulate, distributions::{Value, Distribution}, trace::{Choicemap, Trace}}; 
use std::rc::Rc;

#[r_gen] 
fn flip_my_biased_coins((n, p) : (usize, f64)) {
    let mut flips = vec![Value::Integer(0); n]; 
    for i in 0..n {
        flips[i] = sample!(format!("flip_{}", i), Distribution::Bernoulli(p)); 
    }
}
let (tr, _) = simulate(&mut flip_my_biased_coins, (10, 0.5));
println!("{}", tr.get_trace_string());