Decimals in prob()

ID:152275
 
Jun 11 2007, 5:37 pm
Can decimal numbers be correctly intepretted in prob()?
Jun 11 2007, 5:47 pm
Just use rand()
if(rand(1,1000)==1)
Jun 11 2007, 5:52 pm
In response to Xx Dark Wizard xX
Isn't rand() being "faded out"?
Jun 11 2007, 5:53 pm
In response to Tweelik
No.
Jun 11 2007, 5:59 pm
In response to Xx Dark Wizard xX
No, use prob.
Jun 11 2007, 6:00 pm
In response to Audeuro
He can't when he wants decimals. Or he could use a custom one like,
proc
  xproc(val)
    return rand(1,100/val) = 1
Jun 11 2007, 6:02 pm
In response to Xx Dark Wizard xX
He can get close enough. It's still better than using rand().
Jun 11 2007, 6:08 pm
In response to Audeuro
Is that speed wise, readability-wise, or both?

I always wondered how fast "if(!rand(0,175))" would be compared to the standard methods.
Jun 11 2007, 6:12 pm
In response to DarkCampainger
Both. prob is built for this type of stuff, and you don't have to do any extra work to figure out what chance you want.
Jun 11 2007, 6:35 pm
Tweelik wrote:
Can decimal numbers be correctly intepretted in prob()?

Yes.
Jun 12 2007, 5:47 am
In response to Foomer
When in doubt, test!
var
    total
    success1
    success2
    success3

mob
    Stat()
        statpanel("Progress")
        stat("prob(50)", "[success1]/[total] = [success1/total*100]%")
        stat("prob(50.5)", "[success2]/[total] = [success2/total*100]%")
        stat("prob(50.05)", "[success3]/[total] = [success3/total*100]%")

    New()
        ..()
        spawn()
            if(!total)
                var/T = total+1
                while(T!=total) // while BYOND can track the numbers accurately
                    total = T
                    T++
                    if(prob(50)) success1++
                    if(prob(50.5)) success2++
                    if(prob(50.05)) success3++
                    sleep()
                world << "prob(50) \tdifference = [100*(success1/total - 0.5)/0.5]%"
                world << "prob(50.5) \tdifference = [100*(success2/total - 0.505)/0.505]%"
                world << "prob(50.05) \tdifference = [100*(success3/total - 0.5005)/0.5005]%"

Sorry for ever doubting you, Foomer, but I had to see for myself.
Jun 12 2007, 6:21 am
In response to Shadowdarke
Wow, you sure overcomplicated that. Mine was like 5 lines.