Is there a limit to the amount of local variables you can use?

Solar2D General Questions/Discussion
#1

I’ve just found I am getting a “Runtime error for a bad argument #-2 to ‘insert’ (proxy expected, got nil)”, which after many tests, seems to be due to the amount of local variables within a function. 

Does anyone know anything about this? 

#2

Lua does have a limit of 200 on local vars. Its suggested that you create a local table and create your vars from there.
 

Ex: local tableTmp = {} local a = 1 for i=1, 200 do a= a+1 tableTmp[i] = (a) end
#3

Ahhh, well that might explain it. Thanks for the info!

#4

Ok, I’ve been trying to sort a solution for this issue and am still having trouble. 

Essentially, I have a lot of collision detection coordinates which is what is causing my local variable number to be 200+

For example:

local levelwallShape = { 240, -160  ,  240, 160  ,  204, -45  ,  205, -122  ,  209, -160  }

local levelwallShape1 = { 200, 114  ,  199, 60  ,  204, -45  ,  240, 160  ,  208, 160  }

Using the method suggested above won’t work, as I won’t be able to put these tables of coordinates into another table?

Are there any other methods I can use?

#5

You can put tables into tables…

#6

Can you?

I tried and i did not seem to work. I’ll have another play around and see if I can get it working then. 

#7

per nick, for example (pseudocode just to give idea):

local allYourShapes = {} allYourShapes["wall1"] = { x,y,x,y,x,y..} allYourShapes["wall2"] = { x,y,x,y,x,y.. } local allYourDisplayObjects = {} allYourDisplayObjects["wall1"] = display.newImage(..whatever.. local allYourBodies = {} allYourBodies["wall1"] = physics.addBody(allYourDisplayObjects["wall1"], "dynamic", { shape=allYourShapes["wall1"] }) -- three total locals, but any number of objects wrapped inside each -- also equivalently the form:  allYourStuff.wall1 -- whenever you see the form:  allYourStuff["wall1"]

(btw, hitting this limit might be a clue you could use some reorganization anyway)

hth

#8

Lua does have a limit of 200 on local vars. Its suggested that you create a local table and create your vars from there.
 

Ex: local tableTmp = {} local a = 1 for i=1, 200 do a= a+1 tableTmp[i] = (a) end
#9

Ahhh, well that might explain it. Thanks for the info!

#10

Ok, I’ve been trying to sort a solution for this issue and am still having trouble. 

Essentially, I have a lot of collision detection coordinates which is what is causing my local variable number to be 200+

For example:

local levelwallShape = { 240, -160  ,  240, 160  ,  204, -45  ,  205, -122  ,  209, -160  }

local levelwallShape1 = { 200, 114  ,  199, 60  ,  204, -45  ,  240, 160  ,  208, 160  }

Using the method suggested above won’t work, as I won’t be able to put these tables of coordinates into another table?

Are there any other methods I can use?

#11

You can put tables into tables…

#12

Can you?

I tried and i did not seem to work. I’ll have another play around and see if I can get it working then. 

#13

per nick, for example (pseudocode just to give idea):

local allYourShapes = {} allYourShapes["wall1"] = { x,y,x,y,x,y..} allYourShapes["wall2"] = { x,y,x,y,x,y.. } local allYourDisplayObjects = {} allYourDisplayObjects["wall1"] = display.newImage(..whatever.. local allYourBodies = {} allYourBodies["wall1"] = physics.addBody(allYourDisplayObjects["wall1"], "dynamic", { shape=allYourShapes["wall1"] }) -- three total locals, but any number of objects wrapped inside each -- also equivalently the form:  allYourStuff.wall1 -- whenever you see the form:  allYourStuff["wall1"]

(btw, hitting this limit might be a clue you could use some reorganization anyway)

hth