Rust

Criminology and sociolegal statistics: the C++ kernels of the R and Python packages crimlab, compiled into the crate by its build script with the cc crate (a C++17 compiler is all it needs). No other dependencies.

Every function of the Python package is here under its R name. It takes its named arguments as a JSON object and returns its result as JSON, with the names, checks and results of the R and Python packages: a data frame is an object of columns, a named vector an object of numbers, a missing value null, and a number JSON cannot hold "NaN", "Inf" or "-Inf". A JSON object given for a per-group argument names the groups.

fn main() -> crimlab::Result<()> {
    let r = crimlab::orrisk(r#"{"or": 2, "rate": 0.1, "share": 0.3}"#)?;
    println!("{r}");
    // the same by name; crimlab::jfns() lists every function
    let r = crimlab::jrun("losbnd", r#"{"done": [30, 45, 60], "open": [100, 150]}"#)?;
    println!("{r}");
    Ok(())
}

A refused call returns crimlab::Error, whose message names the function and what is wrong, as in R and Python. Licence: Apache-2.0 WITH LLVM-exception.