Function predict_multiple 

pub fn predict_multiple(
    model: &MultipleRegressionResult,
    predictors_new: &[&[f64]],
) -> Option<Vec<f64>>

Predicts y values given new predictor data and a multiple regression result.

Arguments

• model — Multiple regression result.
• predictors_new — Slice of predictor slices (same order as training).

Returns None if predictor count doesn’t match or lengths differ.