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Signum function.
The signum function is defined as
for any real number x.
import signumf from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-signumf@esm/index.mjs';Evaluates the signum function for a single-precision floating-point number.
var sign = signumf( -5.0 );
// returns -1
sign = signumf( 5.0 );
// returns 1
sign = signumf( -0.0 );
// returns -0
sign = signumf( 0.0 );
// returns 0
sign = signumf( NaN );
// returns NaNTable of results:
| Value | Sign |
|---|---|
x > 0 |
+1 |
x < 0 |
-1 |
0 |
0 |
-0 |
-0 |
NaN |
NaN |
<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">
import randu from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-base-randu@esm/index.mjs';
import round from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-round@esm/index.mjs';
import signumf from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-signumf@esm/index.mjs';
var sign;
var x;
var i;
for ( i = 0; i < 100; i++ ) {
x = round( randu()*100.0 ) - 50.0;
sign = signumf( x );
console.log( 'signum(%d) = %d', x, sign );
}
</script>
</body>
</html>@stdlib/math-base/special/signum: evaluate the signum function for a double-precision floating-point number.
This package is part of stdlib, a standard library with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
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