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feat: update math/base/special/atanh according to the FreeBSD implementation #3126

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feat: update math/base/special/atanh according to the FreeBSD implementation #3126

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0815ad7
docs: update list of contributors
RiyaChy072 Nov 17, 2024
a85fb1e
"converted floating point value to a word"
RiyaChy072 Nov 17, 2024
934f128
docs: update list of contributors
RiyaChy072 Nov 17, 2024
0f0f80a
Merge branch 'update-athah' of https://github.com/RiyaChy072/stdlib i…
RiyaChy072 Nov 17, 2024
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1 change: 1 addition & 0 deletions CONTRIBUTORS
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,7 @@ Mohammad Kaif <[email protected]>
Momtchil Momtchev <[email protected]>
Muhammad Haris <[email protected]>
Naresh Jagadeesan <[email protected]>
Neeraj Pathak <[email protected]>
NightKnight <[email protected]>
Nithin Katta <[email protected]>
Nourhan Hasan <[email protected]>
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18 changes: 11 additions & 7 deletions lib/node_modules/@stdlib/math/base/special/atanh/src/main.c
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Expand Up @@ -78,20 +78,24 @@ static const double NEAR_ZERO = 1.0 / (1 << 28); // 2**-28
* out = stdlib_base_atanh( 0.9 );
* // returns ~1.472
*/

static const double one = 1.0;
static const double zero = 0.0;

double stdlib_base_atanh( const double x ) {
int32_t sgn;
double ax;
double t;
if ( stdlib_base_is_nan( x ) || x < -1.0 || x > 1.0 ) {
return 0.0 / 0.0; // NaN
if ( stdlib_base_is_nan( x ) || x < -one || x > one ) {
return zero / zero ; // NaN
}
if ( x == 1.0 ) {
if ( x === one ) {
return STDLIB_CONSTANT_FLOAT64_PINF;
}
if ( x == -1.0 ) {
if ( x == -one ) {
return STDLIB_CONSTANT_FLOAT64_NINF;
}
if ( x < 0.0 ) {
if ( x < zero ) {
sgn = 1;
ax = -x;
} else {
Expand All @@ -104,9 +108,9 @@ double stdlib_base_atanh( const double x ) {
}
if ( ax < 0.5 ) {
t = ax + ax;
t = 0.5 * stdlib_base_log1p( t + ( t * ax / ( 1 - ax ) ) );
t = 0.5 * stdlib_base_log1p( t + ( t * ax / ( one - ax ) ) );
} else {
t = 0.5 * stdlib_base_log1p( ( ax + ax ) / ( 1 - ax ) );
t = 0.5 * stdlib_base_log1p( ( ax + ax ) / ( one - ax ) );
}
return ( sgn == 1 ) ? -t : t;
}
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