csaps 0.5.0

Cubic spline approximation (smoothing)
Documentation 
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use ndarray::ArrayView1;

use crate::{CsapsError::InvalidInputData, Real, Result};

pub(crate) fn validate_data_sites<T>(x: ArrayView1<T>) -> Result<()>
where
    T: Real<T>,
{
    for w in x.windows(2) {
        let e1 = w[0];
        let e2 = w[1];
        if e2 < e1 || e2.almost_equals(e1) {
            return Err(InvalidInputData(
                "Data site values must satisfy the condition: x1 < x2 < ... < xN".to_string(),
            ));
        }
    }

    Ok(())
}

pub(crate) fn validate_smooth_value<T>(smooth: T) -> Result<()>
where
    T: Real<T>,
{
    if smooth < T::zero() || smooth > T::one() {
        return Err(InvalidInputData(format!(
            "`smooth` value must be in range 0..1, given {:?}",
            smooth
        )));
    }

    Ok(())
}