Package Exports
- double-bits
This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (double-bits) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
double-bits
Routines for manipulating binary representations of a IEEE 754 double precision numbers.
Example
var db = require("double-bits")
//Get higher order word
console.log(db.hi(1.0).toString(16)) //Prints out: 3ff00000
//Get lower order word
console.log(db.lo(1.0).toString(16)) //Prints out: 0
//Combine two words into a double
console.log(db.pack(0, 0x3ff00000)) //Prints out: 1.0
//More sophisticated example: Print out base 2 representation
var pad = require("pad")
function base2Str(n) {
var f = db.fraction(n)
return (db.sign(n) ? "-" : "") +
"2^" + (db.exponent(n)+1) +
" * 0." + pad(f[1].toString(2), 20, "0") +
pad(f[0].toString(2), 32, "0")
}
console.log(base2Str(1.0))
//Prints out:
//
// 2^1 * 0.10000000000000000000000000000000000000000000000000000
//Install
npm install double-bitsAPI
var db = require("double-bits")db(n)
Returns a pair of 32-bit unsigned ints encoding the lower/higher order words respectively representing n
nis an IEEE754 double number
Returns An array, [lo,hi] encoding n
db.lo(n)
Returns the lower order word of n
nis an IEEE754 number
Returns The lower order word of n
db.hi(n)
Returns the higher order word of n
nis an IEEE754 number
Returns The higher order word of n
db.pack(lo, hi)
Given a pair of lower/higher order words, concatenate them into a 64 bit double precision number
lois the lower order wordhiis the higher order word
Returns An IEEE754 double precision number formed by concatenating the bits of lo and hi
db.sign(n)
Returns the state of the sign bit of n
nis an IEEE754 double precision number
Returns The sign bit of n
db.exponent(n)
Returns the exponent of n
nis an IEEE754 double precision number
Returns The exponent of n
db.fraction(n)
Returns the fractional part of n
nis an IEEE754 double precision number
Returns The fractional part of n encoded as a pair of numbers, [lo,hi] where lo is a 32 bit integer and hi is a 21 bit integer.
db.denormalized(n)
Test if a double is denormalized.
nis a number
Returns true if n is denormal, false otherwise
Credits
(c) 2014 Mikola Lysenko. BSD License