Sample Usage:

```html

<!-- brent : https://github.com/croquelois/rootFinder.git -->
<script type="text/javascript" src="lib/rootFinder/rootFinder.js"></script>

<!-- Jmat : https://github.com/lvandeve/jmat.git -->
<script type="text/javascript" src="lib/jmat/jmat.min.js"></script>

<!-- js_lets_be_rational : git@git.quantycarlo.biz:vollib/js_lets_be_rational.git-->
<script type="text/javascript" src="lib/js_lets_be_rational/build/js_lets_be_rational.js"></script>

<!-- --- -->


<!-- js_vollib -->
<script type="text/javascript" src="build/js_vollib.js"></script>

<!-- test_utils : linspace -->
<script type="text/javascript" src="test/test_utils.js"></script>

<script>
    linspace(2, 6, 10).forEach(function(d, di){

        var n = parseInt(Math.pow(10, d));
        var K = linspace(145, 150, n);

        var price = 0.001;
        var F = 100;
        var flag = 'c';
        var r = 0.01;
        var t = 0.5;

        var start = performance.now();
        K.forEach(function(k, ki){
            js_vollib.black.implied_volatility.implied_volatility(price, F, k, r, t, flag);
        });
        var end = performance.now();

        var seconds = (end - start) / 1000;
        var message = K.length + " calls in " + seconds + "  seconds.";
        console.log(message);

    });
</script>

<br/>
<br/>
<h6>To run the tests:</h6>

open js_vollib/test/test_runner.html

<br/>
<br/>
<h6>To re-build:</h6>

npm install
gulp default