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Message: [QUOTE="Mason Kelsey, post: 4649385"] [Note: parts of this message were removed to make it a legal post.] Thanks for the link to documentation on PQueue. If you maintain the link you might want to make it clear in the description that you can order ascending OR descending in the priority queue, and that any component (subarray) of the array can be used to sort/prioritize on. This automatic feature is of use in a lot of different applications. In my code I am adding elements in an ascending order on the first subarray, the heuristic value created by another method. My code is: pq=PQueue.new(proc{|x,y| x[0][0]*<*y[0][0]}) but if I had wanted descending order I would have written pq=PQueue.new(proc{|x,y| x[0][0]*>*y[0][0]}). Note the change from "<" to ">". And if I had wanted to sort on different subarray I would have changed the values in the brackets accordingly, just making sure that the x and y values were the same. Would be nice to have minor sort capabilities too in some applications. I also recommend that all Ruby documentation include simple real code examples of their use by including actual code that has been tested, with all the essential components included in the example. No Sam [/QUOTE]