Set option in acad.lsp

I've been working with AutoCAD for years, and I finally have a desire to
learn something about LISP.

For now, I'd like to place code in acad.lsp to select the options setting
for "Retain changes to xref layers." Does anyone have any suggestions?
(While I'm at it, what is your favorite book for learning to lisp?)

Thank you in advance,
Lost In Stupid Parenthesis

 

You are talking about a system variable, so the first step is to identify
the variable in question. See if you can find the answer in the help files.

--
R. Robert Bell


I've been working with AutoCAD for years, and I finally have a desire to
learn something about LISP.

For now, I'd like to place code in acad.lsp to select the options setting
for "Retain changes to xref layers." Does anyone have any suggestions?
(While I'm at it, what is your favorite book for learning to lisp?)

Thank you in advance,
Lost In Stupid Parenthesis

 

VISRETAIN is the system variable name you want. It's pretty simple to set
it to a particular value, if you just want it to be one of them without
regard for what it is when you open a drawing.

(setvar "VISRETAIN" <whichever-value-you-want>)

Kent Cooper, AIA

 

splendid. thanks for your help.

 

I'm using AutoLSIP Programming Principals and Techniques to learn it, 1 of
my favorite sites is
www.afralisp.com

Of course I've learned alot just following threads here. It's like having
free access to some of the best minds from around the world.

 

as it seem to be you are in kindergarden LISP degrre

I sugest you to visit this place

http://courses.home.att.net/autolisp/

AFRALISP is like the a Holy Book , but you need to learn the very LISP basic before you can get all the amazing tips of AFRALISP.