[MWForum]New to LOGO

[Jeff Knope]

On Tuesday, March 15, 2005
Jim wrote:

> Right now I'm trying to understand how to use arrays in LOGO. I would like 
> to
> create a list and then populate it. I know about list and setitem but
> Microworlds does not seem to recognize array. any suggestions?

Hi Jim,

I may not be the best person to answer your question.  Someone experienced 
with languages that use arrays may be able to help more effectively.  But 
I'll take a stab at it anyway.

Basically, LOGO doesn't use arrays as a type of data structure.  Instead it 
uses lists exclusively.  There are no prior declarations about the 
dimensions, or any other properties, of a list.  You may create a list of 
any size.  You may add more to it, subtract elements from it, manipulate its 
elements (recurrsively, not globally) in any way, at any time.  Also, lists 
may have any number of levels of complexity (lists of lists of lists...). 
(Note too, "setitem" is not a LOGO primitive.)

It may take a little getting used to, but it's a very elastic system.  It 
really does allow any manipulations of data you could want to do.  My guess 
is some other forum members can point you to some exercises that help 
develop skill with, and understanding of, these concepts.

Good luck,
Jeff



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