curve fitting

[Cian-Leaclainne Rebekah Zybutz]

Hi,
I have a specific problem that I am trying to work out with octave right now. 
I have an array of data in it includes a set of x values, y values, xmin error, 
xmax error, ymin error, and ymax error. 
I would like to plot the data with asymmetric errorbars (which I already know 
how to do), but also, with a weighted least-squares fit curve to the data.
Can you please help me with that?
thankyou,
-Cian
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