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Create a single-precision floating-point number from an IEEE 754 literal bit representation.
import fromBinaryStringf from 'https://cdn.jsdelivr.net/gh/stdlib-js/number-float32-base-from-binary-string@esm/index.mjs';
Creates a single-precision floating-point number from an IEEE 754 literal bit representation.
var bstr = '01000000100000000000000000000000';
var v = fromBinaryStringf( bstr );
// returns 4.0
bstr = '01000000010010010000111111011011';
v = fromBinaryStringf( bstr );
// returns ~3.14
bstr = '11111111011011000011101000110011';
v = fromBinaryStringf( bstr );
// returns ~-3.14e+38
The function handles subnormals.
var bstr = '10000000000000000000000000010110';
var val = fromBinaryStringf( bstr );
// returns ~-3.08e-44
bstr = '00000000000000000000000000000001';
val = fromBinaryStringf( bstr );
// returns ~1.40e-45
The function handles special values.
var bstr = '00000000000000000000000000000000';
var val = fromBinaryStringf( bstr );
// returns 0.0
bstr = '10000000000000000000000000000000';
val = fromBinaryStringf( bstr );
// returns -0.0
bstr = '01111111110000000000000000000000';
val = fromBinaryStringf( bstr );
// returns NaN
bstr = '01111111100000000000000000000000';
val = fromBinaryStringf( bstr );
// returns Infinity
bstr = '11111111100000000000000000000000';
val = fromBinaryStringf( bstr );
// returns -Infinity
<!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 pow from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-pow@esm/index.mjs';
import toFloat32 from 'https://cdn.jsdelivr.net/gh/stdlib-js/number-float64-base-to-float32@esm/index.mjs';
import toBinaryStringf from 'https://cdn.jsdelivr.net/gh/stdlib-js/number-float32-base-to-binary-string@esm/index.mjs';
import fromBinaryStringf from 'https://cdn.jsdelivr.net/gh/stdlib-js/number-float32-base-from-binary-string@esm/index.mjs';
var frac;
var sign;
var exp;
var b;
var x;
var y;
var i;
// Convert random numbers to IEEE 754 literal bit representations and then convert them back...
for ( i = 0; i < 100; i++ ) {
if ( randu() < 0.5 ) {
sign = -1.0;
} else {
sign = 1.0;
}
frac = randu() * 10.0;
exp = round( randu()*100.0 );
if ( randu() < 0.5 ) {
exp = -exp;
}
x = sign * frac * pow( 2.0, exp );
x = toFloat32( x );
b = toBinaryStringf( x );
y = fromBinaryStringf( b );
console.log( '%d => %s => %d', x, b, y );
console.log( x === y );
}
</script>
</body>
</html>
@stdlib/number-float32/base/to-binary-string
: return a string giving the literal bit representation of a single-precision floating-point number.@stdlib/number-float64/base/from-binary-string
: create a double-precision floating-point number from a literal bit representation.
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.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
See LICENSE.
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