The configuration file can be plain ruby!
You can define your own DSL to manage the formulars.
So you can load the file once and the formulars do not have to be evaled...

On 05/12/2011 08:08 AM, Zd Yu wrote:
> Joel VanderWerf wrote in post #998154:
>> On 05/11/2011 09:53 PM, Zd Yu wrote:
>>> make it faster?
>> Can you eval your formulas into methods, and call the methods on the
>> data samples?
>
> No. I need flexibility, i.e., allow users to define their own formulas
> in the configuration file.
>