apodize 1.0.0

simple iterators that yield generalized cosine, hanning, hamming, blackman, nuttall and triangular windows
Documentation 
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extern crate apodize;

#[macro_use]
extern crate approx;

const UNITS_IN_LAST_PLACE: u32 = 50;

#[test]
#[should_panic]
fn test_panic_too_short() {
    let _ = apodize::hanning_iter(1);
}

#[test]
fn test_hanning() {
    let actual = apodize::hanning_iter(2).collect::<Vec<f64>>();
    let expected = vec![0.0, 0.0];
    assert_ulps_eq!(
        actual.as_slice(),
        expected.as_slice(),
        max_ulps = UNITS_IN_LAST_PLACE
    );

    let actual = apodize::hanning_iter(3).collect::<Vec<f64>>();
    let expected = vec![0.0, 1.0, 0.0];
    assert_ulps_eq!(
        actual.as_slice(),
        expected.as_slice(),
        max_ulps = UNITS_IN_LAST_PLACE
    );

    let actual = apodize::hanning_iter(10).collect::<Vec<f64>>();
    let expected = vec![
        0.0,
        0.11697777844051094,
        0.4131759111665348,
        0.7499999999999999,
        0.9698463103929542,
        0.9698463103929542,
        0.7499999999999999,
        0.4131759111665348,
        0.11697777844051094,
        0.0,
    ];
    assert_ulps_eq!(
        actual.as_slice(),
        expected.as_slice(),
        max_ulps = UNITS_IN_LAST_PLACE
    );

    let actual = apodize::hanning_iter(11).collect::<Vec<f64>>();
    let expected = vec![
        0.0,
        0.09549150281252627,
        0.3454915028125263,
        0.6545084971874737,
        0.9045084971874737,
        1.0,
        0.9045084971874737,
        0.6545084971874737,
        0.3454915028125264,
        0.09549150281252633,
        0.0,
    ];
    assert_ulps_eq!(
        actual.as_slice(),
        expected.as_slice(),
        max_ulps = UNITS_IN_LAST_PLACE
    );
}

#[test]
fn test_hamming() {
    let actual = apodize::hamming_iter(2).collect::<Vec<f64>>();
    let expected = vec![0.08000000000000002, 0.08000000000000002];
    assert_ulps_eq!(
        actual.as_slice(),
        expected.as_slice(),
        max_ulps = UNITS_IN_LAST_PLACE
    );

    let actual = apodize::hamming_iter(3).collect::<Vec<f64>>();
    let expected = vec![0.08000000000000002, 1.0, 0.08000000000000002];
    assert_ulps_eq!(
        actual.as_slice(),
        expected.as_slice(),
        max_ulps = UNITS_IN_LAST_PLACE
    );

    let actual = apodize::hamming_iter(10).collect::<Vec<f64>>();
    let expected = vec![
        0.08000000000000002,
        0.1876195561652701,
        0.46012183827321207,
        0.7699999999999999,
        0.9722586055615179,
        0.9722586055615179,
        0.7700000000000002,
        0.46012183827321224,
        0.1876195561652702,
        0.08000000000000002,
    ];
    assert_ulps_eq!(
        actual.as_slice(),
        expected.as_slice(),
        max_ulps = UNITS_IN_LAST_PLACE
    );
}

#[test]
fn test_blackman() {
    let actual = apodize::blackman_iter(2).collect::<Vec<f64>>();
    let expected = vec![0.000060000000000004494, 0.000060000000000004494];
    assert_ulps_eq!(
        actual.as_slice(),
        expected.as_slice(),
        max_ulps = UNITS_IN_LAST_PLACE
    );

    let actual = apodize::blackman_iter(3).collect::<Vec<f64>>();
    let expected = vec![0.000060000000000004494, 1.0, 0.000060000000000004494];
    assert_ulps_eq!(
        actual.as_slice(),
        expected.as_slice(),
        max_ulps = UNITS_IN_LAST_PLACE
    );

    let actual = apodize::blackman_iter(10).collect::<Vec<f64>>();
    let expected = vec![
        0.000060000000000004494,
        0.015071173410218106,
        0.14703955786238146,
        0.5205749999999999,
        0.9316592687274005,
        0.9316592687274005,
        0.5205750000000003,
        0.1470395578623816,
        0.015071173410218144,
        0.000060000000000004494,
    ];
    assert_ulps_eq!(
        actual.as_slice(),
        expected.as_slice(),
        max_ulps = UNITS_IN_LAST_PLACE
    );
}

#[test]
fn test_nuttall() {
    let epsilon = 0.000001;

    let actual = apodize::nuttall_iter(2).collect::<Vec<f64>>();
    let expected = vec![0.0, 0.0];
    assert_abs_diff_eq!(actual.as_slice(), expected.as_slice(), epsilon = epsilon);

    let actual = apodize::nuttall_iter(3).collect::<Vec<f64>>();
    let expected = vec![0.0, 1.0, 0.0];
    assert_abs_diff_eq!(actual.as_slice(), expected.as_slice(), epsilon = epsilon);

    let actual = apodize::nuttall_iter(10).collect::<Vec<f64>>();
    let expected = vec![
        0.0,
        0.013748631,
        0.14190082,
        0.51474607,
        0.9305606,
        0.93056047,
        0.51474595,
        0.14190066,
        0.013748631,
        0.0,
    ];
    assert_abs_diff_eq!(actual.as_slice(), expected.as_slice(), epsilon = epsilon);
}

#[test]
fn test_triangular() {
    let actual = apodize::triangular_iter(1).collect::<Vec<f64>>();
    let expected = vec![1.0];
    assert_ulps_eq!(
        actual.as_slice(),
        expected.as_slice(),
        max_ulps = UNITS_IN_LAST_PLACE
    );

    let actual = apodize::triangular_iter(2).collect::<Vec<f64>>();
    let expected = vec![0.5, 0.5];
    assert_ulps_eq!(
        actual.as_slice(),
        expected.as_slice(),
        max_ulps = UNITS_IN_LAST_PLACE
    );

    let actual = apodize::triangular_iter(3).collect::<Vec<f64>>();
    let expected = vec![0.3333333333333333, 1.0, 0.3333333333333333];
    assert_ulps_eq!(
        actual.as_slice(),
        expected.as_slice(),
        max_ulps = UNITS_IN_LAST_PLACE
    );

    let actual = apodize::triangular_iter(10).collect::<Vec<f64>>();
    let expected = vec![
        0.09999999999999998,
        0.30000000000000004,
        0.5,
        0.7,
        0.9,
        0.9,
        0.7,
        0.5,
        0.30000000000000004,
        0.09999999999999998,
    ];
    assert_ulps_eq!(
        actual.as_slice(),
        expected.as_slice(),
        max_ulps = UNITS_IN_LAST_PLACE
    );

    let actual = apodize::triangular_iter(11).collect::<Vec<f64>>();
    let expected = vec![
        0.09090909090909094,
        0.2727272727272727,
        0.4545454545454546,
        0.6363636363636364,
        0.8181818181818181,
        1.,
        0.8181818181818181,
        0.6363636363636364,
        0.4545454545454546,
        0.2727272727272727,
        0.09090909090909094,
    ];
    assert_ulps_eq!(
        actual.as_slice(),
        expected.as_slice(),
        max_ulps = UNITS_IN_LAST_PLACE
    );
}