Function macd 

pub fn macd(
    data: &[f64],
    fast_period: usize,
    slow_period: usize,
    signal_period: usize,
) -> Result<MacdResult>

Calculate Moving Average Convergence Divergence (MACD).

MACD shows the relationship between two moving averages and helps identify trend changes. Standard parameters are (12, 26, 9).

Arguments

• data - Price data (typically close prices)
• fast_period - Fast EMA period (typically 12)
• slow_period - Slow EMA period (typically 26)
• signal_period - Signal line EMA period (typically 9)

Formula

• MACD Line = 12-period EMA - 26-period EMA
• Signal Line = 9-period EMA of MACD Line
• Histogram = MACD Line - Signal Line

Example

use finance_query::indicators::macd;

let prices: Vec<f64> = (1..=50).map(|x| x as f64).collect();
let result = macd(&prices, 12, 26, 9).unwrap();

assert_eq!(result.macd_line.len(), prices.len());
assert_eq!(result.signal_line.len(), prices.len());
assert_eq!(result.histogram.len(), prices.len());