# How can I generate random numbers for demo charts that roughly trend up and to the right?

I need to generate random numbers for several charts that go up and to the right.

I'm using a JavaScript charting engine so will ultimately require numbers in JSON, but I can handle the conversion if you have an easy way outside of JavaScript.

Here's a simple randomNumber generator in JavaScript:

``````function randomNumber(minimum, maximum){
return Math.round( Math.random() * (maximum - minimum) + minimum);
}
console.log(randomNumber(0,100));
``````

The above would work if `min` and `max` grew over time. Can you point me in the right direction?

Here's a JSFiddle to try out various solutions, including a handy chart: http://jsfiddle.net/9ox4wjrf/

Here's a rough example of the sorts of charts I need to build with generated data: Something like this may work:

``````var a = 0.05;
var b = 10; //play with these values to your liking
var y;

//loop here from 0 to whatever
y = a * x^2 + b * x * Math.random();