topic Re: Parameter buffer an Loops in GDL

Parameter buffer and Loops

MF BIM — Thu, 20 Apr 2023 14:30:05 GMT

Hello,

I'd like to know how to improve my use of the Parameter buffer when it comes to loops because I have a loop that create a simple stack of prisms :

for N = 1 to 4 put 0, 0, 15, 1, 0, 15, 1, 1, 15, 0, 1, 15, 0, 0, 1 prism_ nsp/3, 0.5, get(nsp) addz 0.5 next N del 4

I feel this code is not good as I populate and clear the stack with each loop rather than populating it once, looping the geometry and clearing the stack at the end. I would like to make it better but the following snippet doesn't work :

put 0, 0, 15, 1, 0, 15, 1, 1, 15, 0, 1, 15, 0, 0, 1 for N = 1 to 4 prism_ nsp/3, 0.5, use(nsp) addz 0.5 next N del 4 get(nsp) ! Clearing the stack that way after the loop doesn't work

Is there a way to clear the parameter buffer without having to use get() in a command ? Or am I reduced to do this :

put 0, 0, 15, 1, 0, 15, 1, 1, 15, 0, 1, 15, 0, 0, 1 for N = 1 to 4-1 prism_ nsp/3, 0.5, use(nsp) addz 0.5 next N prism_ nsp/3, 0.5, get(nsp) del 3 get(nsp)

Looks less readable but seems to be the only solution ?

Re: Parameter buffer an Loops

kuvbur — Thu, 20 Apr 2023 13:46:01 GMT

Try to use

if NSP>0 then ttt = max(get(NSP))

Final code:

n_prism = 4 put 0, 0, 15 put 1, 0, 15 put 1, 1, 15 put 0, 1, 15 put 0, 0, 1 for N = 1 to n_prism prism_ nsp/3, 0.5, use(nsp) addz 0.5 next N del n_prism if nsp>0 then ttt = max(get(nsp))

Re: Parameter buffer an Loops

MF BIM — Thu, 20 Apr 2023 14:00:41 GMT

Thanks, it worked 👍

Re: Parameter buffer and Loops

yongler — Sat, 09 Sep 2023 00:36:36 GMT

The last get (nsp) is not needed because it does not perform any operations and only extracts data, resulting in a program error.

Re: Parameter buffer and Loops

Barry Kelly — Mon, 11 Sep 2023 01:35:35 GMT

If you only ever 'USE' the PUT stack, then the stack will remain populated.

The last 'GET' just clears the stack so you can use PUT again later if you need to.

Barry.

Re: Parameter buffer and Loops

concepsys — Thu, 11 Jan 2024 14:33:27 GMT

It should be possible to just use GET(NSP) to Empty the stack. While it is not, Thank you for this solution.