Tagged Questions
1
vote
1answer
53 views
Corona Runtime Error: “attempt to call a nil value”
The code below is from a class that creates and returns an alien ship to main.lua in a space shooter game.
I need to include a function that determines what happens if this ship hits an object, but ...
1
vote
1answer
38 views
attempt to fix global 'SWEP' a nil value
I am trying to create a weapon for a friend on Garry's Mod with Lua. I have made it through all other errors but I keep getting this error:
input:22: attempt to index global SWEP (a nil value)
I ...
4
votes
3answers
64 views
List Lua functions in a file
How can I list all the functions included in a Lua source file?
For example, I have fn.lua which contains
function test1()
print("Test 1")
end
function test2()
print("Test 2")
end
...
1
vote
3answers
55 views
Lua - Execute a Function Stored in a Table
I was able to store functions into a table. But now I have no idea of how to invoke them. The final table will have about 100 calls, so if possible, I'd like to invoke them as if in a foreach loop. ...
4
votes
1answer
62 views
Function creating in Lua
When I create the function by assigning ,"if" condition doesn't work but when I do create the function like in second example below, it works. Can you tell me why?
Not working:
local start=os.time()
...
3
votes
2answers
66 views
How to pass a function as a parameter in Lua?
Bit confused by all this; so here's what I am attempting to do!
Have a def thus:
block_basic_DEF =
{
image = "button.png",
name = "basic block",
obj_table = ...
1
vote
2answers
51 views
Corona Lua call external function
I have block_basic.lua that I want to call another function in touch_input.lua
block_basic.lua does:
local screen_touch = require( "touch_input")
local onScreenTouch = screen_touch.onScreenTouch
...
0
votes
0answers
50 views
Luabind - Inheritance / virtual functions
I am trying to expose my scenegraph to lua and I am trying to do that using luabind.
I fiddled around with luabind and got things to work quite nicely until I stumbled upon the problem with virtual ...
0
votes
3answers
52 views
dynamic tables or arrays
I have a function that is meant to dynamically change the size of a 3D Array or table but it keeps breaking saying that it return value nil because it is out of bounds. Here is the code for it:
...
3
votes
2answers
93 views
Using the 'module' function in Lua 5.2?
I have a VC++ project which uses Lua 5.2 for scripting.
I am trying to implement MySQL compatibility into this project.
I do not own this project, so I would prefer to change as little source code as ...
1
vote
1answer
46 views
Change the object (car) speed
I need to change the object speed after I changed his rotation.
function love.update(dt)
if car['speed'] > 0 then
car['x'] = car['x'] + math.cos(car['angle'])
car['y'] = car['y'] + ...
2
votes
2answers
56 views
Concatenate a Function Name in Lua
This is probably really simple but I'm new so here we go..
How would I code this:
local color1 = { 255,0,0 }
local color2 = { 1,200,1 }
local color3 = { 2,2,150 }
for i = 1, 3 do
local x = ...
0
votes
2answers
69 views
Can I use the function yes () to return 1
Is the following function is correct?
local function yes()
return 1
end
local function no()
return 0
end
Can I use it to set the values of the variables in this way?
local May_I = yes()
if ...
0
votes
1answer
32 views
Getting variable from a function
function isEven(x)
print("Checking if "..x.." is even.\nWill return state as 1 if true.")
if math.fmod(x, 2) == 0 then
state = 1
end
return state
end
I know that I can just ...
4
votes
2answers
71 views
Lua functions — a simple misunderstanding
I'm trying to develop a function which performs math on two values which have the same key:
property = {a=120, b=50, c=85}
operator = {has = {a, b}, coefficient = {a = 0.45}}
function Result(x) ...
3
votes
1answer
89 views
call a Lua function just by writing its name (without parentheses)
I'm looking forward to using a variable like "asdf" instead of writing the name function to check its return (which changes now and then). That's why "asdf" variable should update its value everytime ...
0
votes
3answers
50 views
Call function when class is deleted/garbage collected
I have a class that opens a sqlite database in its constructor. Is there a way to have it close the database when it is destroyed (whether that be due to the programmer destroying it or being ...
1
vote
2answers
52 views
Why does clearing a passed table not work inside the function's scope?
Clearing a table like so causes expected behavior:
table1 = { "a" }
table1 = {}
print(unpack(table1)) -- results in printing a blank line
But if you do the same thing inside a function, it ...
0
votes
1answer
122 views
LUA - How to call a function from a string using the _G[x]() method
I'm having a problem with my code and I don't know what's up, I've searched online and the _Gx method was suggested as the best way over ones like loadstring(x)... although I would be happy with ...
0
votes
1answer
155 views
Corona sdk, functions run in wrong order?
I'm trying to save some data in to a table. I get the data from a database and it works ok.
My problem is that the data is not saved in the table. It is a lua table like table = {} and NOT a database ...
2
votes
1answer
113 views
Nil error when trying to call a function in Lua
I'm getting a strange error that I can't for the life of me crack.
I'm coding a card game and I have two tables of different lengths. One links entries to functions, and the other holds the played ...
3
votes
2answers
124 views
Make two objects touchable which were created with a function (LUA, Corona)
I gues this is a real newbie question,
but I have the following code:
local function createCircle()
[...]
circle = display.newCircle( positionX, positionY, circleRadius )
[...]
end
function ...
2
votes
2answers
402 views
Variables Resetting When Using Parallel Function in Lua with ComputerCraft
I am a beginner designing a Lua program in ComputerCraft (Minecraft) that asks the player for their name the first time they use it, and records it. For now, I want a program that detects if the ...
1
vote
0answers
250 views
LuaInterface/C# - Closures created with .NET objects never get cleaned up
I am using the latest version of LuaInterface (http://code.google.com/p/luainterface/) in a C# application. I'm running into a problem where the Lua class is failing to clean up internal references in ...
4
votes
4answers
134 views
Can lua function references be used as table keys?
A Lua newbie here. Can I store function references as keys in a Lua Table? Something similar to this:
local fn = function() print('hello') end
local my_table = {}
my_table[fn] = 123
This does seem ...
1
vote
3answers
93 views
Lua table read and match efficient
My problem is simple, i used to do this in order to check if any of my lines (see photo) bump into any other line (or trail of any other line). But the way i do this now is by doing a lot of if ...
4
votes
3answers
389 views
Passing array as function parameter in Lua?
I'm trying to alter the class example I found in this video to make it a bit more streamlined to use. Hopefully my comments explain what I'm trying to accomplish well enough. The problem I'm having is ...
0
votes
1answer
270 views
Corona sdk enterframe event issue with director
I am having problems with getting a scene to change based on event listeners and global variables.
Basically the scene reiterates after certain selections have been made which increments the ...
1
vote
1answer
754 views
Lua error: string expected, got nil
I need help with my scripts.
I tried nearly everything, but I can't figure it out what the problem is.
I want look.lua to check if str = str.."\nIt's "..getPokemonAge(thing.uid).." old."
Returns with ...
1
vote
2answers
118 views
extracting file data with lua
here's what i've been trying to do with lua.
i have a ton of pictures i transfer back and forth between 2+ computers. I always end up having multiple copies of pictures. I would like my lua code to ...
5
votes
3answers
297 views
Trying to call a function in Lua with nested tables
I am trying to create a C function called Dfetch() that is registered in Lua as fetch(). I am looking for it to be tiered such that I can call dog.beagle.fetch() as the function from Lua. It just ...
1
vote
2answers
76 views
Populating a table inside a Lua function isn't reflected outside
I'm trying to populate a table inside one function and then use the values it received in a later call, removing each value after it has been used. For some reason the values aren't persisting between ...
-1
votes
1answer
71 views
Forward function parameter arg in lua
I would like to override a function to inspect its parameter values but the call it and pass the original parameters as normal. Is this possible? I am using Corona SDK by www.coronalabs.com
My code ...
5
votes
1answer
195 views
Finding every combination of elements in a table (Lua/PseudoCode)
I'm trying to execute a function with every single combination of elements from a table. (In Lua). The table and the elements can change, but the structure will stay the same. The table is ...
3
votes
1answer
81 views
Receive any notify when call undefined function in lua
In C++ code:
class CWindowUI {
public CWindowUI(const char* title,int width,int height);
.....
};
static int CreateWindow(lua_State *l)
{
int width,height;
char *title;
...
0
votes
1answer
111 views
detecting single nil argument in lua
Is it possible to distinguish the call
myFunc()
from
myFunc(nil)
inside the function myFunc?
0
votes
1answer
131 views
Error when defining a function in lua, corona sdk
Please, help me figure out what is the problem in the code.
I am defining a function
local function goOnLesson()
if date.hour==1 then
index=1
local subj=schToday[index]
local text = ...
0
votes
2answers
93 views
lua post hooking a function
I found one topic that's about post hooking, but I don't think it's the same thing as I want to accomplish. topic i found
What I need is the following:
local someBoolean = false
function ...
1
vote
1answer
195 views
Call Lua function by reference
OK, I searched for this, but to no avail. It's kind of a vague thought/idea so... here goes.
Is it possible, in Lua, to call a function (with declared values) and then call it again by reference ...
1
vote
2answers
373 views
Global function in lua
Is there a way to have a function in Lua that can be accessed from any module in a project without having to first require it?
something like:
module(..., package.seeall);
function globFoo()
...
0
votes
1answer
131 views
Concatenation of functions in Lua
I am trying to concatenate a function, as it's really a variable for a player's name, through the use of Lua. The game is once again Command and Conquer: Renegade.
The error is: Attempt to ...
0
votes
1answer
203 views
LZW Data Compression In Lua [duplicate]
Possible Duplicate:
LZW Compression In Lua
Here is my code for compressing data in Lua using the LZW compression method. My problem is that the function is returning the character 'T', ...
2
votes
2answers
246 views
LZW Compression In Lua
Here is the Pseudocode for Lempel-Ziv-Welch Compression.
pattern = get input character
while ( not end-of-file ) {
K = get input character
if ( <<pattern, K>> is NOT in
...
0
votes
1answer
191 views
Reverse String in Lua?
I am trying to reverse a string in Lua without using the string.reverse() function. Here is my code -
function reverseStr(s)
return string.gsub(s, "(.)(.)", "%2%1")
end
The code is currently ...
1
vote
2answers
173 views
Lua Max Number Finder
Here is my code for a simple program that finds the largest number in a table, and returns the number and it's index. My problem is that the program isn't working with negatives.
numbers = {1, 2, ...
1
vote
2answers
544 views
Calling a lua function from table.subtable in C++
im trying to call a lua function from C++ where function is in subtable of global table. Im using lua version 5.2.* compiled from source.
Lua function
function globaltable.subtable.hello()
-- do ...
1
vote
1answer
711 views
C++ & Lua, push Lua table as argument
I'm integrating Lua in C++, and now I have this table that behaves as a 'class', and for some functions it needs a 'self' argument, which actually is the table. The Lua code:
a = {
numb = 5,
create ...
1
vote
2answers
132 views
How do I make Lua pause from runing a while?
I was looking for a way to pause my program to allow the user to read before it closes but the function (os.sleep(timeSeconds)) doesn't exist apparently. Anyone know a work around?
Thanks
1
vote
1answer
155 views
How can I resolve function-dependency loops in Lua?
In my Lua code (using the Corona SDK), my issue essentially boils down to this:
local function foo()
bar()
end
local function bar()
foo()
end
However, because Lua is done line-by-line, ...
0
votes
2answers
93 views
Creating Lua Functions to avoid code repetition in the same file
I am having following type of code ,that I used 6-7 times in the same file:
str=(line):match("constraints(.*)end")
for split in string_gsplit(str, '\n', true) do
if
string.match(split,'%a+')
then
...
