truecalc-core 3.1.0

Formula engine with exact Google Sheets semantics — stateless, embeddable evaluator
Documentation 
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use crate::types::{ErrorKind, Value};
use super::stat_helpers::collect_nums_a_direct;
use super::var_s::sample_variance;

/// `STDEVA(value1, ...)` - sample standard deviation including text/bool.
pub fn stdeva_fn(args: &[Value]) -> Value {
    if args.is_empty() { return Value::Error(ErrorKind::NA); }
    let nums = match collect_nums_a_direct(args) { Ok(v) => v, Err(e) => return e };
    match sample_variance(&nums) {
        Value::Number(v) => {
            let s = libm::sqrt(v);
            if s.is_finite() { Value::Number(s) } else { Value::Error(ErrorKind::Num) }
        }
        other => other,
    }
}

#[cfg(test)]
mod tests;