Lua: converting from float to int
You could use math.floor(x) From the Lua Reference Manual: Returns the largest integer smaller than or equal to x.
lua
What is the relationship between PyTorch and Torch?
Here a short comparison on pytorch and torch. Torch: A Tensor library like numpy, unlike numpy it has strong GPU support. Lua is a wrapper for Torch (Yes! you need to have a good understanding of Lua), and for that you will need LuaRocks package manager. PyTorch: No need for the LuaRocks package manager, no … Read more
How to exit a Lua script’s execution?
Use os.exit() or just return from some “main” function if your script is embedded.
Safely remove items from an array table while iterating
the general case of iterating over an array and removing random items from the middle while continuing to iterate If you’re iterating front-to-back, when you remove element N, the next element in your iteration (N+1) gets shifted down into that position. If you increment your iteration variable (as ipairs does), you’ll skip that element. There … Read more
How to read data from a file in Lua
Try this: — http://lua-users.org/wiki/FileInputOutput — see if the file exists function file_exists(file) local f = io.open(file, “rb”) if f then f:close() end return f ~= nil end — get all lines from a file, returns an empty — list/table if the file does not exist function lines_from(file) if not file_exists(file) then return {} end local … Read more
Function/variable scope (pass by value or reference?)
You guessed right, table variables are passed by reference. Citing Lua 5.1 Reference Manual: There are eight basic types in Lua: nil, boolean, number, string, function, userdata, thread, and table. …. Tables, functions, threads, and (full) userdata values are objects: variables do not actually contain these values, only references to them. Assignment, parameter passing, and … Read more
Lua print on the same line
Use io.write instead print, which is meant for simple uses, like debugging, anyway.
What is a good game engine that uses Lua? [closed]
Game engines that use Lua Free unless noted Agen (2D Lua; Windows) Amulet (2D Lua; Window, Linux, Mac, HTML5, iOS) Cafu 3D (3D C++/Lua) Cocos2d-x (2D C++/Lua/JS; Windows, Linux, Mac, iOS, Android, BlackBerry) Codea (2D&3D Lua; iOS (Editor is iOs app); $14.99 USD) Cryengine by Crytek (3D C++/Lua; Windows, Mac) Defold (2D Lua; Windows, Linux, … Read more
lua: retrieve list of keys in a table
local keyset={} local n=0 for k,v in pairs(tab) do n=n+1 keyset[n]=k end Note that you cannot guarantee any order in keyset. If you want the keys in sorted order, then sort keyset with table.sort(keyset).
How to format a lua string with a boolean variable?
Looking at the code of string.format, I don’t see anything that supports boolean values. I guess tostring is the most reasonable option in that case. Example: print(“this is: ” .. tostring(true)) — Prints: this is true