Lua: Rounding numbers and then truncate
There is no build-in math.round() function in Lua, but you can do the following: print(math.floor(a+0.5)).
lua
Awesome WM: Move window from one screen to another [closed]
Awesome WM: Move window from one screen to another [closed]
Difference between ‘ and ” within Lua
Nope. No difference, except that you can enclose the other inside the ones that you are using. — No difference between these myStr = “Hi!!” myStr=”Hi!!” myStr = [[Hi!!]] — The ‘weird’ way to make a string literal IMO… — Double quotes enclosed in single quotes myStr=”My friend said: “Hi!!”” — Single quotes enclosed in … Read more
Lua operators, why isn’t +=, -= and so on defined?
This is just guesswork on my part, but: 1. It’s hard to implement this in a single-pass compiler Lua’s bytecode compiler is implemented as a single-pass recursive descent parser that immediately generates code. It does not parse to a separate AST structure and then in a second pass convert that to bytecode. This forces some … Read more
is there any keyword like const or anything else which does the same job with it in lua?
I know this question is seven years old, but Lua 5.4 finally brings const to the developers! local a <const> = 42 a = 100500 Will produce an error: lua: tmp.lua:2: attempt to assign to const variable ‘a’ Docs: https://www.lua.org/manual/5.4/manual.html#3.3.7.
How to quickly initialise an associative table in Lua?
The correct way to write this is either local t = { foo = 1, bar = 2} Or, if the keys in your table are not legal identifiers: local t = { [“one key”] = 1, [“another key”] = 2}
Lua multiline comments past ]]’s
As you can see in Strings tutorial there is a special [===[ syntax for nesting square braces. You can use it in block comments too. Just note, that number of = signs must be the same in open and close sequence. For example 5 equals will work. –[=====[ for k,v in pairs(t) do local d … Read more
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 do I get the number of keys in a hash table in Lua?
I experimented with both the # operator and table.getn(). I thought table.getn() would do what you wanted but as it turns out it’s returning the same value as #, namely 0. It appears that dictionaries insert nil placeholders as necessary. Looping over the keys and counting them seems like the only way to get the … Read more
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