I was trying to locate a good simple sorting method and found one however in attempts to use it, it appears not to work the way I had expected.
a := [[1, 7], [2, 3], [5, 4], [1, 2], [8, 9], [7, 9], [1, 6]]:
In hopes to sort the x position in order and in the event that there existed x positions the same I thought I might sort the y position first so that the order for the y position would be set and then all that would be needed was to sort the x and I would be set. Unfortunately it didn't work. I expected maple to hold the lists as they were presented and as I show it didn't matter that I sorted the y positions first.
b := sort(a, (x, y) -> evalb(x < y) ) # First sort the y positions of a
b := [[1, 2], [2, 3], [5, 4], [1, 6], [1, 7], [7, 9], [8, 9]]
sort(a, (xo, yo) -> evalb(xo < yo) ) # Second sort the x positions of b
[[1, 6], [1, 2], [1, 7], [2, 3], [5, 4], [7, 9], [8, 9]]
I had expected that [1,2] would stay in front of [1,6] as Maple had ordered them in b. So when I sorted b (because it is a list) I had thought Maple would just systematically shuffle them accordingly.
Am I right to say that in this case Maple uses memory locations using sort regardless of it being a list? and how can I sort it ?