Decimal problem

[Deltanic]

Some code in onPlayerWasted:

local playerkills = getElementData ( source, "Kills" )
local playerdeaths = getElementData ( source, "Deaths" ) + 1
if playerkills == 0 then
local playerratio = 1/playerdeaths
tonumber( ("%.2f"):format(playerratio) ) 
setElementData ( source, "Ratio", playerratio  )
else
local playerratio = playerkills/playerdeaths
tonumber( ("%.2f"):format(playerratio) ) 
setElementData ( source, "Ratio", playerratio  )
end

But, it returns when I died three times and I haven't killed still 0.333343, and I don't know where that four can come from. Is this script wrong, or am I doing it wrong?

Edited December 20, 2009 by Guest

[robhol]

That's just not how tonumber works. Tonumber returns the "numberized" value, it doesn't change the variable you put in.

[Deltanic]

EDIT: Result after 3 deaths, 0 kills:

0.330000013

Code:

local playerkills = getElementData ( source, "Kills" )
local playerdeaths = getElementData ( source, "Deaths" ) + 1
if playerkills == 0 then
local playerratio = 1/playerdeaths
setElementData ( source, "Ratio", tonumber( ("%.2f"):format(playerratio)  )
else
local playerratio = playerkills/playerdeaths
setElementData ( source, "Ratio", tonumber( ("%.2f"):format(playerratio)  )
end

So the result is different, but it isn't what I want. What to do now?

[50p]

EDIT: Result after 3 deaths, 0 kills:

0.330000013

Code:

local playerkills = getElementData ( source, "Kills" )
local playerdeaths = getElementData ( source, "Deaths" ) + 1
if playerkills == 0 then
local playerratio = 1/playerdeaths
setElementData ( source, "Ratio", tonumber( ("%.2f"):format(playerratio)  )
else
local playerratio = playerkills/playerdeaths
setElementData ( source, "Ratio", tonumber( ("%.2f"):format(playerratio)  )
end

So the result is different, but it isn't what I want. What to do now?

What do you want if that's not what you want? Why do you use 1 when playerkills is equal to 0? What if playerdeaths is 0? You will fail.

[robhol]

What do you want if that's not what you want? Why do you use 1 when playerkills is equal to 0? What if playerdeaths is 0? You will fail.

playerdeaths will never be 0 if he doesn't start out on a negative number (which is unlikely) since he increments it before any dangerous divisions.

[Deltanic]

What do you want if that's not what you want? Why do you use 1 when playerkills is equal to 0? What if playerdeaths is 0? You will fail.

I use 1 / playerdeaths, because divide by 0 is impossible. But what you say is also true, the answer would be not what I want. But I changed it:

1/playerdeaths/2

Indeed playerdeaths would be never 0, because this is only called when the player dies.

But that doesn't matter. My numbers still won't have 2 decimals. I still don't know what to do.

[MikeChip]

I think he wants a Kill per Death ratio...

function getPlayerKDRatio(player)
local kills, deaths = getElementData(player, "Kills"), getElementData(player, "Deaths")
local ratio = kills/deaths
if(kills > 0 and deaths <= 0) then return string.format("%.2f", kills) end
return string.format("%.2f", ratio)
end

[50p]

What do you want if that's not what you want? Why do you use 1 when playerkills is equal to 0? What if playerdeaths is 0? You will fail.

playerdeaths will never be 0 if he doesn't start out on a negative number (which is unlikely) since he increments it before any dangerous divisions.

Not necessarily.

What do you want if that's not what you want? Why do you use 1 when playerkills is equal to 0? What if playerdeaths is 0? You will fail.

I use 1 / playerdeaths, because divide by 0 is impossible. But what you say is also true, the answer would be not what I want. But I changed it:

1/playerdeaths/2

Indeed playerdeaths would be never 0, because this is only called when the player dies.

But that doesn't matter. My numbers still won't have 2 decimals. I still don't know what to do.

You can NOT divide by 0 but you can divide 0 by anything but 0, which will give you 0.

[robhol]

Not necessarily.. what?

If you start with a non-negative number, say, 5, you divide by 6.

If you start with 0, you divide by 1.

The only way in which you can have a dangerous division operator is if you start with -1, becoming 0. And that's unlikely, since you can't have died -1 times in a game.

[50p]

But you can get invalid or unexpected results from getElementData since every resource can modify element's data especially such as "Deaths", "Kills", etc. therefore using names such as "myresource.deaths" is more suitable for element data and is safer.

[Deltanic]

string.format("%.2f", playerratio)

AWESOME! Thank you