combinations, nchoosek or similar function nx2 array

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Justin
Justin 2012-1-12
I have data points (x and y) that I am using to fit a curve. I need to find out which 4 give me the best fit.
So I need a way to represent the 'x y' pair together or find a function that can give me combinations of each row.
At the moment I get every combinations of x values and then re-pair then with the y values after, very inefficient
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Matt Tearle
Matt Tearle 2012-1-12
I'm having a hard time interpreting the question. "... which 4 give me the best fit" -- which 4 what? (x,y) pairs? Are you fitting a curve to four points, so you want to take every 4-point combination from the n data points that you have? Can you provide a simple example? You have x and y in what form? n-element vectors? So something like
x y
0 0
1 1
2 4
3 9
4 16
5 25
6 36
So now what are you looking for from this?

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