How to use lua command math.eval

1
votes

I have heard about a lua library or function math.eval :

http://wiki.inspired-lua.org/index.php?title=math.eval&setlang=fr

I have this error message :

! LuaTeX error ./Calcul.lua:11: attempt to call field 'eval' (a nil value) stack traceback: ./Calcul.lua:11: in function 'NbRandom' [\directlua]:1: in main chunk. \Calculs code ...^^@-\par \directlua { NbRandom () }

when I try to use it as this :

Nb = math.eval("3-7+8")

What did I miss ?

1
lua

1 Answers

4
votes

From the top of the page you linked:

math.eval is a math library extension.

This has been introduced in TI-Nspire OS 3.0 (Changes).

That's not a core lua function. It is specific to TI-Nspire OS 3.0+.

That being said I'm not sure I understand why that function even exists since loadstring seems to allow the same sort of thing.

loca val=loadstring("return 3-7+8")()