LÖVE

So, I was chugging along, coding my project. I have a bad habit of coding huge amounts and then deciding to check to see if it works. So I wrote 2 huge functions and a little one all without checking to see if they work and what do you know, I can't get the biggest one to work for the life of me. It keeps telling me that I'm attempting to call a number on line 43, which means (according to my internet searching) that lua expected a function and got a number instead. So what's the deal? The entire line looks like this: So I don't see any problem, all the variables in question were set before the call, so I'm very confused...
I uploaded the whole code for your guys to check if you feel like it. Please halp?

missing multiplication signs?
ua_num = ((l_x2 - l_x1) * (a_y1 - l_y1)) - ((l_y2 - l_y1) * (a_x1 - l_x1))

your kidding?
*revises code*
*facedesk* I feel very stupid right now... I thought that the brackets implied multiplication, my bad!

Sadly the mathematical idea that the brackets imply multiplication is rarely implemented by programming languages. Interestingly, Lua, unlike most programming languages, is resolved the syntax as a function call as supposed to raising syntax errors.

I bet you could do some metatable magic to make it multiply stuff in cases like this.

Mmm...metatables...

A quick visit to #lua later...

21:17 < krka> debug.setmetatable(0, {__call = function(x, y) return x * y end})
21:17 < krka> return (5)(6+7)
21:17 < krka> --> 65
21:18 < thelinx> heh, awesome
21:18 < krka> return 5(6+7) is a syntax error however