Function lgamma

std/math/src/main/float.rs:171–175

(x: f64)

#[plugin_fn]
fn lgamma(x: f64) -> Result<f64> {
    let r = libm::lgamma(x);
    if r.is_nan() && !x.is_nan() { return Err(dom()); }
    Ok(r)
}

/* Floating-point manipulation and classification */