Fitting Lorentzian curve to noisy data

I have a set of noisy x and y data that strongly resembles a Lorenzian curve, but I am having trouble finding how to fit the curve to my data. I do not have the optimization or curve fitting toolbox. Does anyone have any ideas on how I can fit a curve to my data points? I feel like there is a very simple solution that I just havent found yet. Thanks!

Answer 1

[Jonathan Sullivan]

You many want to try this:

http://www.mathworks.com/matlabcentral/fileexchange/33775-lorentzian-fit

[Mackenzie]

Thank you so much!!! Perfect