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test: migrate math/base/special/gamma-lanczos-sum-expg-scaledf to ULP-based testing #13801

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test: migrate math/base/special/gamma-lanczos-sum-expg-scaledf to ULP-based testing #13801

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13 changes: 2 additions & 11 deletions lib/node_modules/@stdlib/math/base/special/gamma-lanczos-sum-expg-scaledf/test/test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -24,13 +24,12 @@
var linspace = require( '@stdlib/array/base/linspace' );
var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
var gamma = require( '@stdlib/math/base/special/gamma' );
var absf = require( '@stdlib/math/base/special/absf' );
var exp = require( '@stdlib/math/base/special/exp' );
var pow = require( '@stdlib/math/base/special/pow' );
var f32 = require( '@stdlib/number/float64/base/to-float32' );
var EPS = require( '@stdlib/constants/float32/eps' );
var G = require( '@stdlib/constants/float32/gamma-lanczos-g' );
var isAlmostSameValue = require( '@stdlib/number/float32/base/assert/is-almost-same-value' );
var gammaLanczosSumExpGScaledf = require( './../lib' );

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Identifier name 'gammaLanczosSumExpGScaledf' is too long (> 25)


// TESTS //
Expand All @@ -49,8 +48,6 @@

tape( 'the function evaluates the Lanczos sum (scaled by exp(-g))', function test( t ) {
var expected;
var delta;
var tol;
var i;
var x;
var y;
Expand All @@ -59,18 +56,12 @@
for ( i = 0; i < x.length; i++ ) {
y = gammaLanczosSumExpGScaledf( x[i] );

// TODO: replace with `gammaf`, `powf`, and `expf` when available

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Unexpected 'todo' comment: 'TODO: replace with `gammaf`, `powf`, and...'
expected = gamma( x[i] );
expected /= pow( x[i]+G-0.5, x[i]-0.5 ) / ( exp( x[i]+G-0.5 ) );
expected /= exp( G );
expected = f32( expected );
if ( y === expected ) {
t.strictEqual( y, expected, 'returns expected value' );
} else {
delta = absf( y - expected );
tol = 2.0 * EPS * absf( expected );
t.ok( delta <= tol, 'within tolerance. x: '+x[i]+'. y: '+y+'. E: '+expected+'. Δ: '+delta+'. tol: '+tol );
}
t.strictEqual( isAlmostSameValue( y, expected, 2 ), true, 'returns expected value' );
}
t.end();
});
13 changes: 2 additions & 11 deletions ...node_modules/@stdlib/math/base/special/gamma-lanczos-sum-expg-scaledf/test/test.native.js
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Original file line number Diff line number Diff line change
Expand Up @@ -25,18 +25,17 @@
var linspace = require( '@stdlib/array/base/linspace' );
var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
var gamma = require( '@stdlib/math/base/special/gamma' );
var absf = require( '@stdlib/math/base/special/absf' );
var exp = require( '@stdlib/math/base/special/exp' );
var pow = require( '@stdlib/math/base/special/pow' );
var f32 = require( '@stdlib/number/float64/base/to-float32' );
var EPS = require( '@stdlib/constants/float32/eps' );
var G = require( '@stdlib/constants/float32/gamma-lanczos-g' );
var isAlmostSameValue = require( '@stdlib/number/float32/base/assert/is-almost-same-value' );
var tryRequire = require( '@stdlib/utils/try-require' );


// VARIABLES //

var gammaLanczosSumExpGScaledf = tryRequire( resolve( __dirname, './../lib/native.js' ) );

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Identifier name 'gammaLanczosSumExpGScaledf' is too long (> 25)
var opts = {
'skip': ( gammaLanczosSumExpGScaledf instanceof Error )
};
Expand All @@ -58,8 +57,6 @@

tape( 'the function evaluates the Lanczos sum (scaled by exp(-g))', opts, function test( t ) {
var expected;
var delta;
var tol;
var i;
var x;
var y;
Expand All @@ -68,18 +65,12 @@
for ( i = 0; i < x.length; i++ ) {
y = gammaLanczosSumExpGScaledf( x[ i ] );

// TODO: replace with `gammaf`, `powf`, and `expf` when available

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Unexpected 'todo' comment: 'TODO: replace with `gammaf`, `powf`, and...'
expected = gamma( x[i] );
expected /= pow( x[i]+G-0.5, x[i]-0.5 ) / ( exp( x[i]+G-0.5 ) );
expected /= exp( G );
expected = f32( expected );
if ( y === expected ) {
t.strictEqual( y, expected, 'x: '+x[ i ]+', y: '+y+', expected: '+expected );
} else {
delta = absf( y - expected );
tol = 2.0 * EPS * absf( expected );
t.ok( delta <= tol, 'within tolerance. x: '+x[ i ]+'. y: '+y+'. E: '+expected+'. Δ: '+delta+'. tol: '+tol );
}
t.strictEqual( isAlmostSameValue( y, expected, 2 ), true, 'returns expected value' );
}
t.end();
});
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