Is it possible to use function such as math.abs and math.random in the cookbook?

If so, how do I import them?

As long, as they are not available, I can give you a self-written absolute-function:

function abs(x)

y=x

if y <0 then y=-y end

return y

end

Do you also want an integer function?

In your function you don't need to different variables.

function abs(y)

if y <0 then

return -y

end

return y

end

If you have a nice random function I would be interested.

The randomness is probably best produced at the moment by taking the last digits of the score through.

If you have a good ideas/code on doing split testing I would also be grateful. At the moment I don't have a way to test whether a change improves the recipe or doesn't.

Yes, in our (TheMarquis and me) random bond recipe, we use the sum of segment-scores as seed value, multiply it with a high value to get some "noise" and then perform a modulo operation.

And the way how you mix the segment scores together and multiply them will give some good variations:

http://fold.it/portal/recipe/2116

To check, if a recipe changed the score in a positive way, I store the sum of all segment-scores before (in this way you can also grab scores below zero) and do "save recent best".

Then I perform my desired action.

When the recipe has finished, I calculate the score-sum again,

and compare this score-sum result with the score-sum of the initial state.

If the initial state is better than the new state, I do "restore", else i keep the new puzzle result.

Also, have a look here:

They are not currently available, however, that functionality may be added in the future.