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Omar
Omar

Reputation: 1091

Working with lists in LOGO

I'm trying a recursive program in ACSLogo (a mac version of Logo) and want to return a list of 2 integers (basically and X coordinate and a Y coordinate). I cannot figure out how to get it to return 2 values. It does one no problem.

Also, when you create a list and you wish to refer back to it to extract a value in a particular index, it seems like you have to paste the list as is and you cannot refer to it by an assigned name.

Example:

Item 4 [1 1 2 3 5 8 13 21]

You cannot name that list "fibb" and refer to it like this X + fibb item 4

Upvotes: 4

Views: 462

Answers (1)

Steven Doggart
Steven Doggart

Reputation: 43743

You can assign a list to a variable name like this:

Make "locations [1 1 2 3 5 8 13 21]

You can then access one of the items in the list like this:

Item 1 :locations

For instance, to set a variable named x equal to the second item, you could do this:

Make "x (Item 2 :locations)

Next, to make a new list from two different values, you can use the List command, for instance:

Make "location (List 1 2)

Or, from variables:

Make "location (List :x :y)

So, to get an x and y coordinate out of a list of locations and then create a new location variable containing both the x and y values, you could do this:

Make "locations [1 1 2 3 5 8 13 21]
Make "x (Item 1 :locations)
Make "y (Item 2 :locations)
Make "location (List :x :y)

Or, more simply:

Make "locations [1 1 2 3 5 8 13 21]
Make "location (List (Item 1 :locations) (Item 2 :locations))

Upvotes: 3

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