Function get_w_checked

crates/openquant/src/bet_sizing.rs:233–239

(price_div: f64, m_bet_size: f64, func: &str)

        "sigmoid" => Ok(limit_price_sigmoid(t_pos, pos, f, w, max_pos)),
        "power" => Ok(limit_price_power(t_pos, pos, f, w, max_pos)),
        _ => {
            Err(BetSizingError::InvalidFunction { context: "limit_price", func: func.to_string() })
        }
    }
}

pub fn get_w_sigmoid(price_div: f64, m_bet_size: f64) -> f64 {
    (price_div * price_div) * ((1.0 / (m_bet_size * m_bet_size)) - 1.0)
}