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I have a list of tuples representing coordinates of points. How can I sort them by the first or second value, so that I could order my points from left to right first and from top to bottom next?
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In python, to sort list of tuples by the first element in descending order, we have to use the sort() method with the parameter ” (reverse=True) “ which will sort the elements in descending order.
Given tuples, we need to sort them according to any given key. This can be done using sorted() function where we sort them using key=last and store last as the key index according to which we have to sort the given tuples. # according to given key.
You can use one of the easiest sorting algorithm that is bubble sort. In case of tuples in tuple it will sort in order of first element of tuple. So ((32, "b"), (1, "c"), (23,"a")) Now if you sort it it will sort it in the order of 1st element of tuple.
In Python, there are two ways, sort() and sorted() , to sort lists ( list ) in ascending or descending order. If you want to sort strings ( str ) or tuples ( tuple ), use sorted() .
Sounds like you want e.g.
myList |> List.sortBy fst
http://research.microsoft.com/en-us/um/cambridge/projects/fsharp/manual/FSharp.Core/Microsoft.FSharp.Collections.List.html
But tuples support structural equality and comparison, so the default sort (lexicographical) may do what you want.
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