dice macro question

if you want to say roll 4d6 drop the lowest and if the total is less than 8 i want to reroll that set of 4d6...  how would i do that?

I don't know to produce that with a roll expression, but I'd sidestep the issue and change the roll to 2d6+6.  Here's an anydice page showing how close they are . And you dont have to worry about rerolls.

no way to reroll a set based on the summed total?

Why not just make the minimum roll 8 with {4d6dl1,8}kh1 ?

Chase P. said: no way to reroll a set based on the summed total? There might be a way, I'm Silvyre could do it. It's beyond my ability though, I was just suggesting an alternative. For years now, I've switched to 2d6+6 (no rerolls) whenever playing any game that asks you to roll some variation of 4d6, keep 3. It's made those games better, IMO. That said, since you're a pro user, if you're the creator of the campaign you can definitely do it with a script if there's no other way. 

Kyle G. said: Why not just make the minimum roll 8 with {4d6dl1,8}kh1 ? "Cannot mix sum and M rolls in a roll group"

fixed the macro with this [[{4d6dl1,8d1}k1]]

well, keeping 8 as your minimum =/= rerolling the whole expression, but usually when you get that Cannot mix sum and M rolls in a roll group error, you can replace the 8 with a 0d0+8 to make the two parts 'the same' as far as the parser is concerned.