Re: List Sort

On Feb 1, 2004, at 9:48 AM, Will Davis wrote:

> Hi all,
>  
> I'm trying to sort a list of vectors using the sort list with 
> method-name operator, and can't really understand the syntax. Does the 
> sort command have arguments? How are you meant to specify the sorting 
> method (method-name) - can it have arguments? If not, how do you get 
> the data to sort the list in the first place? Basically, my algorithm 
> takes two vector arguments and compares the vector components and 
> sorts so that -x goes before +x, then by y and then by z, so that the 
> list ends up sorted from (-x,-y,-z) to (x,y,z).
>  
> Any help on this would be greatly appreciated.

Take a look at the "Walker" demo -- the genomes there are sorted
by distance:

		sort seats with compare-distance.

The "compare-distance" method looks like this:

	+ to compare-distance of a (object) with b (object):
		result (float).

		result = (b get-distance) - (a get-distance).
		return result.

Your compare distance will take vectors, do some calculation, and
return a value indicating which of the vectors should come first
in the sorted list.

- jon klein 

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