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test: add tests for C99 edge cases #6389

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Merged
merged 4 commits into from
Apr 2, 2025
Merged

test: add tests for C99 edge cases #6389

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daa14d9
chore: improve implementation and tests
anandkaranubc Mar 26, 2025
0f68b5c
Merge branch 'stdlib-js:develop' into fix/cabs
anandkaranubc Apr 2, 2025
ae3c95d
fix: update implementation to follow the C99 standard
anandkaranubc Apr 2, 2025
cc1f448
chore: remove extra linebreak
anandkaranubc Apr 2, 2025
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1 change: 0 additions & 1 deletion lib/node_modules/@stdlib/math/base/special/cabs/lib/main.js
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,6 @@ var imag = require( '@stdlib/complex/float64/imag' );
* // returns ~5.83
*/
function cabs( z ) {
// TODO: consider whether to use C99 rules for special cases involving infinities and nans (see https://github.com/python/cpython/blob/f4c03484da59049eb62a9bf7777b963e2267d187/Objects/complexobject.c#L191)
return hypot( real( z ), imag( z ) );
}

Expand Down
52 changes: 48 additions & 4 deletions lib/node_modules/@stdlib/math/base/special/cabs/test/test.js
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Expand Up @@ -23,6 +23,8 @@
var tape = require( 'tape' );
var isnan = require( '@stdlib/math/base/assert/is-nan' );
var EPS = require( '@stdlib/constants/float64/eps' );
var PINF = require( '@stdlib/constants/float64/pinf' );
var NINF = require( '@stdlib/constants/float64/ninf' );
var abs = require( '@stdlib/math/base/special/abs' );
var Complex128 = require( '@stdlib/complex/float64/ctor' );
var cabs = require( './../lib' );
Expand Down Expand Up @@ -67,17 +69,59 @@ tape( 'the function computes the absolute value of a complex number', function t
t.end();
});

tape( 'if either the real or imaginary component is `NaN`, the function returns `NaN`', function test( t ) {
tape( 'if either the real or imaginary component is `+infinity`, the function returns `+infinity`', function test( t ) {
var v;

v = cabs( new Complex128( PINF, 3.0 ) );
t.strictEqual( v, PINF, 'returns expected value' );

v = cabs( new Complex128( 5.0, PINF ) );
t.strictEqual( v, PINF, 'returns expected value' );

v = cabs( new Complex128( PINF, PINF ) );
t.strictEqual( v, PINF, 'returns expected value' );

v = cabs( new Complex128( NaN, PINF ) );
t.strictEqual( v, PINF, 'returns expected value' );

v = cabs( new Complex128( PINF, NaN ) );
t.strictEqual( v, PINF, 'returns expected value' );

t.end();
});

tape( 'if either the real or imaginary component is `-infinity`, the function returns `+infinity`', function test( t ) {
var v;

v = cabs( new Complex128( NINF, 3.0 ) );
t.strictEqual( v, PINF, 'returns expected value' );

v = cabs( new Complex128( 5.0, NINF ) );
t.strictEqual( v, PINF, 'returns expected value' );

v = cabs( new Complex128( NINF, NINF ) );
t.strictEqual( v, PINF, 'returns expected value' );

v = cabs( new Complex128( NaN, NINF ) );
t.strictEqual( v, PINF, 'returns expected value' );

v = cabs( new Complex128( NINF, NaN ) );
t.strictEqual( v, PINF, 'returns expected value' );

t.end();
});

tape( 'if either the real or imaginary component is `NaN` but not `+-infinity`, the function returns `NaN`', function test( t ) {
var v;

v = cabs( new Complex128( NaN, 3.0 ) );
t.strictEqual( isnan( v ), true, 'returns NaN' );
t.strictEqual( isnan( v ), true, 'returns expected value' );

v = cabs( new Complex128( 5.0, NaN ) );
t.strictEqual( isnan( v ), true, 'returns NaN' );
t.strictEqual( isnan( v ), true, 'returns expected value' );

v = cabs( new Complex128( NaN, NaN ) );
t.strictEqual( isnan( v ), true, 'returns NaN' );
t.strictEqual( isnan( v ), true, 'returns expected value' );

t.end();
});
52 changes: 48 additions & 4 deletions lib/node_modules/@stdlib/math/base/special/cabs/test/test.native.js
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Expand Up @@ -24,6 +24,8 @@ var resolve = require( 'path' ).resolve;
var tape = require( 'tape' );
var isnan = require( '@stdlib/math/base/assert/is-nan' );
var EPS = require( '@stdlib/constants/float64/eps' );
var PINF = require( '@stdlib/constants/float64/pinf' );
var NINF = require( '@stdlib/constants/float64/ninf' );
var abs = require( '@stdlib/math/base/special/abs' );
var Complex128 = require( '@stdlib/complex/float64/ctor' );
var tryRequire = require( '@stdlib/utils/try-require' );
Expand Down Expand Up @@ -76,17 +78,59 @@ tape( 'the function computes the absolute value of a complex number', opts, func
t.end();
});

tape( 'if either the real or imaginary component is `NaN`, the function returns `NaN`', opts, function test( t ) {
tape( 'if either the real or imaginary component is `+infinity`, the function returns `+infinity`', opts, function test( t ) {
var v;

v = cabs( new Complex128( PINF, 3.0 ) );
t.strictEqual( v, PINF, 'returns expected value' );

v = cabs( new Complex128( 5.0, PINF ) );
t.strictEqual( v, PINF, 'returns expected value' );

v = cabs( new Complex128( PINF, PINF ) );
t.strictEqual( v, PINF, 'returns expected value' );

v = cabs( new Complex128( NaN, PINF ) );
t.strictEqual( v, PINF, 'returns expected value' );

v = cabs( new Complex128( PINF, NaN ) );
t.strictEqual( v, PINF, 'returns expected value' );

t.end();
});

tape( 'if either the real or imaginary component is `-infinity`, the function returns `+infinity`', opts, function test( t ) {
var v;

v = cabs( new Complex128( NINF, 3.0 ) );
t.strictEqual( v, PINF, 'returns expected value' );

v = cabs( new Complex128( 5.0, NINF ) );
t.strictEqual( v, PINF, 'returns expected value' );

v = cabs( new Complex128( NINF, NINF ) );
t.strictEqual( v, PINF, 'returns expected value' );

v = cabs( new Complex128( NaN, NINF ) );
t.strictEqual( v, PINF, 'returns expected value' );

v = cabs( new Complex128( NINF, NaN ) );
t.strictEqual( v, PINF, 'returns expected value' );

t.end();
});

tape( 'if either the real or imaginary component is `NaN` but not `+-infinity`, the function returns `NaN`', opts, function test( t ) {
var v;

v = cabs( new Complex128( NaN, 3.0 ) );
t.strictEqual( isnan( v ), true, 'returns NaN' );
t.strictEqual( isnan( v ), true, 'returns expected value' );

v = cabs( new Complex128( 5.0, NaN ) );
t.strictEqual( isnan( v ), true, 'returns NaN' );
t.strictEqual( isnan( v ), true, 'returns expected value' );

v = cabs( new Complex128( NaN, NaN ) );
t.strictEqual( isnan( v ), true, 'returns NaN' );
t.strictEqual( isnan( v ), true, 'returns expected value' );

t.end();
});