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path: root/js/src/tests/ecma_6/Math/tanh-approx.js
blob: 252322a099ca6e49e4da044375d610166ffa1f2f (plain)
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var sloppy_tolerance = 2;

for (var i = -20; i < 20; i++) {
    assertNear(Math.tanh(i),
               (Math.exp(i) - Math.exp(-i)) / (Math.exp(i) + Math.exp(-i)),
               sloppy_tolerance);
}

assertEq(Math.tanh(1e300), 1);

var tanh_data = [
    [-0.9999983310699463, -6.998237084679027],
    [-0.9999978542327881, -6.87257975132917],
    [-0.999992847442627, -6.2705920974657525],
    [-0.9999861717224121, -5.940967614084813],
    [-0.9999828338623047, -5.832855225378502],
    [-0.9999399185180664, -5.20646301208756],
    [-0.9998834133148193, -4.8749821841810785],
    [-0.9998509883880615, -4.752279497280338],
    [-0.9996016025543213, -4.260504202858904],
    [-0.9993612766265869, -4.0244334353203115],
    [-0.9989283084869385, -3.7655641082999236],
    [-0.9969782829284668, -3.246782610980921],
    [-0.9950058460235596, -2.9950671179940938],
    [-0.9942638874053955, -2.9256242749609536],
    [-0.990715742111206, -2.6839646283308363],
    [-0.9903340339660645, -2.663723350226518],
    [-0.9760982990264893, -2.207464998348322],
    [-0.975830078125, -2.201817459680556],
    [-0.9728245735168457, -2.1424542308291437],
    [-0.9643559455871582, -2.0046686756020917],
    [-0.9377224445343018, -1.7188337346177065],
    [-0.9362406730651855, -1.7066940482565154],
    [-0.9310147762298584, -1.6659543005533146],
    [-0.9284839630126953, -1.6472838718760747],
    [-0.9270248413085938, -1.6368067340881562],
    [-0.9075665473937988, -1.5135473477311114],
    [-0.897477388381958, -1.4590986086331497],
    [-0.8920106887817383, -1.431681573516303],
    [-0.8776559829711914, -1.365471286049011],
    [-0.864722728729248, -1.3117705583444539],
    [-0.8482067584991455, -1.249725893334944],
    [-0.8056559562683105, -1.1145246028592257],
    [-0.8048388957977295, -1.112200609756455],
    [-0.7801985740661621, -1.0458778330822556],
    [-0.7749934196472168, -1.032711173436253],
    [-0.7619285583496094, -1.0007967281362184],
    [-0.7504425048828125, -0.9739672824457072],
    [-0.7495596408843994, -0.9719492983286864],
    [-0.7481319904327393, -0.968698942014487],
    [-0.7459518909454346, -0.9637657636705832],
    [-0.7401137351989746, -0.9507308314464193],
    [-0.7289731502532959, -0.9265325319867653],
    [-0.7226788997650146, -0.9132299082876396],
    [-0.7161557674407959, -0.8997082193533088],
    [-0.7017018795013428, -0.8706453720344796],
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    [-0.6847054958343506, -0.837919455842005],
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    [-0.6747090816497803, -0.8193374156276964],
    [-0.6575610637664795, -0.7885046044142132],
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    [-0.33507001399993896, -0.3485286317501442],
    [-0.32572221755981445, -0.3380352468276522],
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    [1.6504814008555524e-12, 1.6504814008555524e-12],
    [2.0654207510961697e-12, 2.0654207510961697e-12],
    [6.933230031758164e-12, 6.933230031758164e-12],
    [1.3351444949627478e-11, 1.3351444949627478e-11],
    [1.6399812063916386e-11, 1.6399812063916386e-11],
    [5.730159402528301e-11, 5.730159402528301e-11],
    [1.113731329382972e-10, 1.113731329382972e-10],
    [1.4214707189097453e-10, 1.4214707189097453e-10],
    [3.8006320313144215e-10, 3.8006320313144215e-10],
    [6.09162720266454e-10, 6.09162720266454e-10],
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    [0.7817282676696777, 1.0497991719828956],
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    [0.8313877582550049, 1.1926138225701433],
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    [0.8678996562957764, 1.3245040433929398],
    [0.8679344654083252, 1.3246451309261607],
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    [0.9099440574645996, 1.5271990851861994],
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    [0.9149219989776611, 1.556931837197936],
    [0.9184908866882324, 1.5792896628381612],
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    [0.9296839237213135, 1.6560555223295368],
    [0.9298396110534668, 1.6572041418041492],
    [0.9352962970733643, 1.6990986433619266],
    [0.9376416206359863, 1.718164398807965],
    [0.9410912990570068, 1.7475084077246632],
    [0.962122917175293, 1.9737180163455101],
    [0.9748215675354004, 2.1811227771083783],
    [0.9769454002380371, 2.2257214499698255],
    [0.985663890838623, 2.4654635601650536],
    [0.9880380630493164, 2.5565869228142004],
    [0.9928233623504639, 2.8132383539094192],
    [1e-300, 1e-300],
    [0.00001, 0.000010000000000333334],
    [0.3, 0.3095196042031117],
    [1e-30, 1e-30],
    [1e-10, 1e-10],
];

for (var [x, y] of tanh_data)
    assertNear(Math.tanh(y), x, sloppy_tolerance);

reportCompare(0, 0, "ok");