truecalc-core 1.0.1

Spreadsheet formula engine — parser and evaluator for Excel-compatible formulas
Documentation 
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use crate::types::{ErrorKind, Value};
use super::stat_helpers::collect_nums_direct;
use super::var_s::sample_variance;

/// `STDEV(value1, ...)` — sample standard deviation (same as STDEV.S).
pub fn stdev_fn(args: &[Value]) -> Value {
    if args.is_empty() {
        return Value::Error(ErrorKind::NA);
    }
    let nums = match collect_nums_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::Error(ErrorKind::Num)
            } else {
                Value::Number(s)
            }
        }
        other => other,
    }
}

#[cfg(test)]
mod tests;