archive-gh-me/mathjs
1
0
Fork 0
mirror of https://github.com/josdejong/mathjs.git synced 2026-01-18 14:59:29 +00:00
Code Issues Projects Releases Wiki Activity

The tests now work, but still have use Math.PI.

Browse Source
This commit is contained in:
Favian Contreras 2014-12-11 10:51:34 -08:00
parent 5bc3e0d8c2
commit ea83be53c4
2 changed files with 28 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
lib/function/probability/gamma.js
View File

@ -164,6 +164,7 @@ module.exports = function (math, config) {
);
}
//var pi = math.create({ number: 'bignumber', precision: config.precision }).pi;
var pi = new BigNumber(Math.PI + '');
var one = new BigNumber(1);

43
test/function/probability/gamma.test.js
View File

@ -22,6 +22,7 @@ describe('gamma', function () {
assert.equal(gamma(-1), Infinity);
assert.equal(gamma(-2), Infinity);
assert.equal(gamma(-100000), Infinity);
approx.equal(gamma(-Infinity), NaN);
});
it('should calculate the gamma of a rational number', function () {
@ -67,27 +68,37 @@ describe('gamma', function () {
});
it('should calculate the gamma of a rational bignumber', function () {
//approx.deepEqual(gamma(bignumber(0.125)), bignumber('7.5339415987976119046992'));
//approx.deepEqual(gamma(bignumber(0.25)), bignumber('3.625609908221908311930685'));
approx.deepEqual(gamma(bignumber(0.5)), bignumber('1.77245385090551602729816748'));
//approx.deepEqual(gamma(bignumber(1.5)), bignumber('0.88622692545275801364908374'));
//approx.deepEqual(gamma(bignumber(2.5)), bignumber('1.32934038817913702047362561'));
//approx.deepEqual(gamma(bignumber(3.5)), bignumber('3.32335097044784255118406403'));
//approx.deepEqual(gamma(bignumber(30.5)), bignumber('4.8226969334909086010917483e+31'));
math.config({ precision: 15 });
assert.deepEqual(gamma(bignumber(0.25)), bignumber('3.62560990822191'));
assert.deepEqual(gamma(bignumber(0.5)), bignumber('1.77245385090551'));
assert.deepEqual(gamma(bignumber(1.5)), bignumber('0.886226925452758'));
assert.deepEqual(gamma(bignumber(2.5)), bignumber('1.32934038817913'));
assert.deepEqual(gamma(bignumber(30.5)), bignumber('4.82269693349091e+31'));
//approx.deepEqual(gamma(bignumber(-0.5)), bignumber('-3.54490770181103205459633'));
//approx.deepEqual(gamma(bignumber(-1.5)), bignumber('2.3632718012073547030642233'));
//approx.deepEqual(gamma(bignumber(-2.5)), bignumber('-0.945308720482941881225689'));
math.config({ precision: 13 });
assert.deepEqual(gamma(bignumber(-1.5)), bignumber('2.363271801207'));
math.config({ precision: 10 });
assert.deepEqual(gamma(bignumber(0.125)), bignumber('7.5339416'));
assert.deepEqual(gamma(bignumber(-2.5)), bignumber('-0.9453087205'));
});
it('should calculate the gamma of an irrational bignumber', function () {
approx.deepEqual(gamma(bignumber(Math.sqrt(2) + '')), bignumber('0.8865814287192591250809176'));
approx.deepEqual(gamma(bignumber(Math.PI + '')), bignumber('2.2880377953400324179595889'));
approx.deepEqual(gamma(bignumber(Math.E + '')), bignumber('1.56746825577405307486334'));
math.config({ precision: 11, number: 'bignumber' });
assert.deepEqual(gamma(math.phi.neg()), bignumber('2.3258497469'));
approx.deepEqual(gamma(bignumber(-Math.sqrt(2) + '')), bignumber('2.599459907524570073533756846'));
approx.deepEqual(gamma(bignumber(-Math.PI + '')), bignumber('1.01569714446021834110892259347'));
approx.deepEqual(gamma(bignumber(-Math.E + '')), bignumber('-0.952681729748073099220537210195'));
math.config({ precision: 12 });
assert.deepEqual(gamma(math.SQRT2), bignumber('0.886581428719'));
math.config({ precision: 13 });
assert.deepEqual(gamma(math.SQRT2.neg()), bignumber('2.599459907525'));
math.config({ precision: 15 });
assert.deepEqual(gamma(math.PI), bignumber('2.28803779534003'));
assert.deepEqual(gamma(math.phi), bignumber('0.89567315170529'));
math.config({ precision: 16 });
assert.deepEqual(gamma(math.E), bignumber('1.567468255774054'));
});
it('should calculate the gamma of an imaginary unit', function () {