Function matvec_multiply_fast 

pub unsafe fn matvec_multiply_fast(
    matrix: &Array2<f64>,
    vector: &[f64],
    result: &mut [f64],
)

Fast matrix-vector multiplication using unsafe optimizations

Computes result = matrix * vector

Safety

• matrix must have the same number of columns as vector has elements
• result must have the same length as matrix has rows
• All slices must be properly aligned and valid