Function functional_mape 

pub fn functional_mape(
    y_true: &FdMatrix,
    y_pred: &FdMatrix,
    argvals: &[f64],
) -> Result<f64, FdarError>

Functional Mean Absolute Percentage Error integrated over argvals.

Computes functional_mape = (1/n) * sum_i ∫ |y_true_i(t) - y_pred_i(t)| / |y_true_i(t)| dt where the integral is approximated by Simpson’s rule over argvals.

Errors

• FdarError::InvalidDimension if shapes are inconsistent.
• FdarError::InvalidParameter if any value of y_true is near zero (|y_true| < NUMERICAL_EPS), which would cause division by zero.