CAR... CADR... CDR... Hierarchy

[Lee Mac]

Hi Guys,

 

Was just wondering if someone could provide me with an explanation of the system behind the "car" "cadr" "cdr" etc etc.

 

Only reason I ask, is that I have recently seen "cdadr" in a LISP and can't find any help item on it.

 

Thanks

 

Lee

[lpseifert]

http://ronleigh.info/autolisp/afude09.htm#car

[rkmcswain]

Only reason I ask, is that I have recently seen "cdadr" in a LISP and can't find any help item on it.

 

In addition to the other link, this is covered in the developers guide.

 

AutoLISP Developer's Guide > Using the AutoLISP Language > AutoLISP Basics > List Handling > Point Lists

[Lee Mac]

Larry - that link is awesome! Exactly what I was looking for - thanks for the quick response

 

And thank you also McSwain - I tried double clicking on "cdadr" in the vlide, and nothing appeared in the help when I did that - so I assumed that there was nothing on it.

 

But thanks for the extra information and clarification

 

Cheers guys,

 

Lee

[David Bethel]

Another good reference is George Omura's ABC's of AutoLISP:

 

http://klobouk.fsv.cvut.cz/~chour/Lisp/Chapter%201.htm

 

-David

[Lee Mac]

Another Brilliant reference!

 

Thanks David.

[rkmcswain]

I tried double clicking on "cdadr" in the vlide, and nothing appeared in the help when I did that - so I assumed that there was nothing on it.

This happens a lot. I am more familiar with the printed developers guide and I remember a lot of things from there that aren't always obvious in the CHM version.

[Lee Mac]

This happens a lot. I am more familiar with the printed developers guide and I remember a lot of things from there that aren't always obvious in the CHM version.

 

Ahh, I see, I suppose another case where experience counts