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lib-cov
*.seed
*.log
*.csv
*.dat
*.out
*.pid
*.gz
pids
logs
results
npm-debug.log
node_modules/*

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The MIT License (MIT)
Copyright (c) 2013 Mikola Lysenko
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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almost-equal
============
Checks when two floats are almost equal.
Use
===
First install using npm:
npm install almost-equal
Then use as follows:
```javascript
var almostEqual = require("almost-equal")
var a = 100
, b = 100 + 1e-12
//Check if a == b up to float precision
console.log(almostEqual(a, b, almostEqual.FLT_EPSILON, almostEqual.FLT_EPSILON))
//Check if a == b up to double precision
console.log(almostEqual(a, b, almostEqual.DBL_EPSILON, almostEqual.DBL_EPSILON))
```
### `almostEqual(a, b[, absoluteTolerance [, relativeTolerance]])`
Checks if two floats are within the given tolerances of one another using the formula:
|a - b| < max(absoluteTolerance, min(|a|, |b|) * relativeTolerance)
* `a` and `b` are the two numbers to comapre
* `absoluteTolerance` is a fixed minimal tolerance (set to 0 to ignore)
* `relativeTolerance` is a tolerance that scales with a/b (set to 0 to ignore)
**Returns** `true` if `a` and `b` are approximately equal.
If tolerance argument is omitted, `almostEqual.DBL_EPSILON` value is used by default.
### `almostEqual.FLT_EPSILON`
Floating point (32-bit) epsilon
### `almostEqual.DBL_EPSILON`
Double precision (64-bit) epsilon
Credits
=======
(c) 2013 Mikola Lysenko. MIT License

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"use strict"
var abs = Math.abs
, min = Math.min
function almostEqual(a, b, absoluteError, relativeError) {
var d = abs(a - b)
if (absoluteError == null) absoluteError = almostEqual.DBL_EPSILON;
if (relativeError == null) relativeError = absoluteError;
if(d <= absoluteError) {
return true
}
if(d <= relativeError * min(abs(a), abs(b))) {
return true
}
return a === b
}
almostEqual.FLT_EPSILON = 1.19209290e-7
almostEqual.DBL_EPSILON = 2.2204460492503131e-16
module.exports = almostEqual

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{
"name": "almost-equal",
"version": "1.1.0",
"description": "Test if two floats are almost equal",
"main": "almost_equal.js",
"directories": {
"test": "test"
},
"dependencies": {},
"devDependencies": {
"tap": "~0.4.1"
},
"scripts": {
"test": "tap test/*.js"
},
"repository": {
"type": "git",
"url": "git://github.com/mikolalysenko/almost-equal.git"
},
"keywords": [
"float",
"compare",
"double",
"round",
"equal",
"almost",
"near",
"tolerance",
"epsilon",
"FLT_EPSILON",
"DBL_EPSILON"
],
"author": "Mikola Lysenko",
"license": "MIT",
"readmeFilename": "README.md",
"gitHead": "bb9919030f650a6b1b5a9f0f65c406055146d259"
}

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var almostEqual = require("../almost_equal.js")
require("tap").test("almost-equal", function(t) {
var a = 100
, b = 100 + 1e-12
//Check if a == b up to float precision
t.assert(almostEqual(a, b, almostEqual.FLT_EPSILON, almostEqual.FLT_EPSILON))
//Check if a == b up to double precision
t.assert(!almostEqual(a, b, almostEqual.DBL_EPSILON, almostEqual.DBL_EPSILON))
t.end()
})