Function rgsl::statistics::wsd_with_fixed_mean

pub fn wsd_with_fixed_mean(
    w: &[f64], 
    wstride: usize, 
    data: &[f64], 
    stride: usize, 
    n: usize, 
    mean: f64
) -> f64

The standard deviation is defined as the square root of the variance. This function returns the square root of the corresponding variance function above.