The Powder Toy

powder_is_epic

This code keeps giving me the error, please help me figure out why. Specifically the for loop is causing the error.

-- Update and Graphics functions.

function GMPRup(i, x, y, s, nt)

for r in sim.neighbors(x,y,1,1) do

if (sim.partProperty(r, "type") == elem.DEFAULT_PT_SPRK) then

-- Credit to Jerehmia for helping me figure out how sim.partProperty worked.

sim.partProperty(i, sim.FIELD_TMP, sim.partProperty(i, sim.FIELD_TMP) + 1)

end

-- Sleep function from some random website on the internet.

local clock = os.clock

function sleep(n)

local t0 = clock()

while clock() - t0 <= n do end

end

for sim.partProperty(i, sim.FIELD_TMP), 1, 10, -1 do

sleep(2)

if s ~= nt then

for dx = -1, 1 do

for dy = -1, 1 do

if dx ~= 0 or dy ~= 0 then

sim.partCreate(-1, x + dx, y + dy, elem.DEFAULT_PT_SPRK)

end

ArolaunTech

What line is the error on?

powder_is_epic

for sim.partProperty(i, sim.FIELD_TMP), 1, 10, -1 do

that line

jacob1

For help with Lua, I'd recommend you find an online guide, like this one . Reading up to section 4 would get you familiar with control structures like for loops.

There's also the Lua manual, I use this a lot.

That for loop simply isn't valid Lua, and I don't know what you're trying to do, so I think you should use some of those guides to understand the language better.

Also, you should remove that sleep function. Sleeping within element update functions would lag the game so hard, and you've just created an expensive busy loop that will waste CPU time.

powder_is_epic

heres what i want to do. i want so when SPRK is beside QMPR it adds +1 to tmp then a few seconds later sparks all elements around it as many times as the number of tmp, as long as it is not higher then 10 or lower then 1, like a transistor/capacitator kinda thing. because quantum computing allows you to save signals that are at 0.4 or 0.6 instead of 0 and 1. also yeah this element is kinda laggy. anyways ima read that guide. EDIT okay my code is this now:

fv = sim.partProperty(i, sim.FIELD_TMP, sim.partProperty(i, sim.FIELD_TMP) +0)

for fv, 1, 10, -1 do

but now im getting <name> expected near 1

all im trying to do is what the guide says i need to do i have a variable im iterating by, a range (1 through 10) and -1 so each time it runs it subtracts one from the tmp value. so i have no idea why this aint working, and i tried:

for fv=sim.partProperty(i, sim.FIELD_TMP, sim.partProperty(i, sim.FIELD_TMP) +0), 1, 10, -1 do

and that doesnt work EITHER.

this whole issue is probably that i did something you can only do in python or something stupid lol. and when i figure it out im gonna look like a idiot ngl.

creator_of_fail

To get around using sleep functions, you could use PROP_LIFE_DEC in element properties and that acts like a clock that drops by 1 every frame. Then you could set life to 100 for example and create a check for when life hits 0.

Also, here's a sample for loop from one of my scripts:

for range=1,sim.partProperty(i,sim.FIELD_TMP4) do
shift(i,range,direction)
end

powder_is_epic

ANOTHER ERROR - so i found a function online that lets me do for loops like in Python, so i finally have that sorted out, but now im getting this error - NUMBER EXPECTED, GOT NIL - for this line of code.

i = sim.partProperty(i, sim.FIELD_TMP, sim.partProperty(i, sim.FIELD_TMP) +0)

kinda confused here cause i used this exact like of code earlier and im pretty sure it works

creator_of_fail

@powder_is_epic (View Post)

This is in your update function right? I'm not too sure what you are trying to do with that but there's already an i in the update function which is the index of the particle and reusing variables can have confusing results.

powder_is_epic

ooooh

Error: = or in expected near . pls help