Re: Best way to...

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  • Posted by Spock Oct 17, 2010
  • 1782 views
irv said...

Thanks for the suggestions. The following code, copied from a javascript version, works and gives a reasonably accurate distance, as well. This takes slightly more than 1 second on my computer, which is acceptable.

SNIP

Hi Irv,

Your code has several math identities to exploit for faster execution, as we all know. Another speed-up could be to sort the 3 shortest distances inside the main loop, eg: 

atom km, a, b, c 
-- a, b, c get initialized with some ridiculous default value before entering the main loop 
 
-- at the end of the loop perform this optimized sort 
  if km < c then 
    if km < b then 
      if km < a then 
        c=b 
        b=a 
        a=km  
      else 
        c=b 
        b=km  
      end if 
    else 
      c=km  
    end if 
  end if

More code infrastructure is required but this shows the idea.

Spock

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