r2rs-nmath 0.1.1

Statistics programming for Rust based on R's nmath package
Documentation 
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// "Whatever you do, work at it with all your heart, as working for the Lord,
// not for human masters, since you know that you will receive an inheritance
// from the Lord as a reward. It is the Lord Christ you are serving."
// (Col 3:23-24)

use std::str::FromStr;

use strafe_testing::{
    r::{RString, RTester},
    r_assert_relative_equal, r_assert_relative_equal_result,
};
use strafe_type::{tof64, Checked, Positive64, Real64};

use crate::{
    distribution::multinom::MultinomialBuilder,
    reset_statics,
    rng::MarsagliaMulticarry,
    traits::{Distribution, RNG},
};

pub fn density_inner(
    x: Vec<Checked<Real64>>,
    prob: Option<Vec<Checked<Positive64>>>,
    size: Option<usize>,
) {
    let mut builder = MultinomialBuilder::new();
    if let Some(prob) = prob {
        builder.set_probability(prob);
    } else if let Some(size) = size {
        builder.set_size(size);
    }
    let multinomial = builder.build();

    let xs = x.iter().map(|x| tof64!(x)).collect::<Vec<_>>();
    let ps = multinomial
        .probability
        .iter()
        .map(|p| tof64!(p))
        .collect::<Vec<_>>();

    let rust_ans = multinomial.density(x);
    let r_ans = RTester::new()
        .set_display(&RString::from_string(format!(
            "dmultinom({}, prob={}, log={})",
            RString::from_f64_slice(&xs),
            RString::from_f64_slice(&ps),
            RString::from_bool(false),
        )))
        .run()
        .expect("R running error")
        .as_f64();

    r_assert_relative_equal_result!(r_ans, rust_ans);
}

pub fn log_density_inner(
    x: Vec<Checked<Real64>>,
    prob: Option<Vec<Checked<Positive64>>>,
    size: Option<usize>,
) {
    let mut builder = MultinomialBuilder::new();
    if let Some(prob) = prob {
        builder.set_probability(prob);
    } else if let Some(size) = size {
        builder.set_size(size);
    }
    let multinomial = builder.build();

    let xs = x.iter().map(|x| tof64!(x)).collect::<Vec<_>>();
    let ps = multinomial
        .probability
        .iter()
        .map(|p| tof64!(p))
        .collect::<Vec<_>>();

    let rust_ans = multinomial.log_density(x);
    let r_ans = RTester::new()
        .set_display(&RString::from_string(format!(
            "dmultinom({}, prob={}, log={})",
            RString::from_f64_slice(&xs),
            RString::from_f64_slice(&ps),
            RString::from_bool(true),
        )))
        .run()
        .expect("R running error")
        .as_f64();

    r_assert_relative_equal_result!(r_ans, rust_ans);
}

pub fn random_inner(seed: u16, prob: Option<Vec<Checked<Positive64>>>, size: Option<usize>) {
    let num = 50;

    let mut builder = MultinomialBuilder::new();
    if let Some(prob) = prob {
        builder.set_probability(prob);
    } else if let Some(size) = size {
        builder.set_size(size);
    }
    let multinomial = builder.build();

    let ps = multinomial
        .probability
        .iter()
        .map(|p| tof64!(p))
        .collect::<Vec<_>>();

    let r_state = RTester::new()
        .set_seed(seed)
        .set_display(&RString::from_str(".Random.seed").unwrap())
        .run()
        .unwrap()
        .as_f64_vec()
        .unwrap()
        .into_iter()
        .skip(1)
        .map(|i| i as i32)
        .collect::<Vec<_>>();

    let mut rust_rng = MarsagliaMulticarry::new();
    rust_rng.set_seed(seed as u32);

    let rust_state = rust_rng.get_state();

    for (r, rust) in r_state.iter().zip(rust_state.iter()) {
        assert_eq!(r, rust, "States not equal!");
    }

    let r_ret = RTester::new()
        .set_seed(seed)
        .set_display(&RString::from_string(format!(
            "rmultinom({}, prob={}, size={})",
            RString::from_f64(num as f64),
            RString::from_f64_slice(&ps),
            RString::from_f64(multinomial.probability.len()),
        )))
        .run()
        .unwrap()
        .as_f64_matrix()
        .unwrap()
        .column_iter()
        .map(|r_i| r_i.data.into_slice().to_vec())
        .collect::<Vec<_>>();

    reset_statics();
    let rust_ret = (0..num)
        .map(|_| multinomial.random_sample(&mut rust_rng))
        .collect::<Vec<_>>();

    for (r, rust) in r_ret.iter().zip(rust_ret.iter()) {
        for (r_i, rust_i) in r.iter().zip(rust.iter()) {
            r_assert_relative_equal!(*r_i, tof64!(rust_i));
        }
    }
}