Author Topic: unexpected errors  (Read 2223 times)

0 Members and 1 Guest are viewing this topic.

Offline doco

  • Newbie
  • *
  • Posts: 4
  • Karma: +0/-0
unexpected errors
« on: 16 October, 2005, 19:32:01 »
Code: [Select]
-- declare variables
local radicand

-- struct
    for x=-5 , 5 do
        radicand=x^2-9
       
        print( x , radicand )  -- TEST: display variables

        if radicand>=0 then
            print( x , sqrt(radicand) )
        else
            print( x , "unreal number" )
        end
 
    end



produces:

Quote
-5   16
lua: drc_testIfStruct.lua:11: attempt to call global `sqrt' (a nil value)
stack traceback:
   drc_testIfStruct.lua:11: in main chunk
   [C]: ?

why?

TIA
doco
Luck is the residue of design...

PtokaX forum

unexpected errors
« on: 16 October, 2005, 19:32:01 »

Offline bluebear

  • Double Ace
  • *
  • Posts: 116
  • Karma: +12/-0
  • Life is a bitch - And then you marry one!
(No subject)
« Reply #1 on: 16 October, 2005, 20:00:20 »
Ise'nt it math.sqrt and not "sqrt"..

Error is clear: a nil value; means that sqrt don't exist.
In some cases you need to load the math lib yourself before you can use it.

/Bluebear
Sincerely,
bluebear
--
http://www.thewildplace.dk/ is is closed - Use the following mirrors instead
http://bluebear.psycho-chihuahua.net
http://pxextension.piratez.dk/
[Lua extensions - Chat stats - YnHub PMSpy - DC Source code - and more]

Offline doco

  • Newbie
  • *
  • Posts: 4
  • Karma: +0/-0
(No subject)
« Reply #2 on: 16 October, 2005, 20:21:49 »
Quote
Ise'nt it math.sqrt and not "sqrt"..

You're most likely correct.  I am just learning and have found that none of the other 'global' functions or constants are working either.  Evidently because they're are not finding those 'class libraries'.

I tried your suggestion and works fine.  Which leads me to another qestion: is there an 'API' or list of these class libraries somewhere?  and what those libraries contain?

Thanks
doco
Luck is the residue of design...

PtokaX forum

(No subject)
« Reply #2 on: 16 October, 2005, 20:21:49 »