homographic interpolation of experimental data point

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SYML2nd
SYML2nd on 20 Jun 2019
Commented: John D'Errico on 24 Jun 2019
Hi all,
I have a theoretical and practical problem.
I want to do interpolation using this homographic function y = (ax + b)/(cx + d) of some experimental data, in order to find the coefficient a, b ,c ,d.
I know that if I want to do a polynomial interpolation, I need to use polyfit, but I cannot use this for this homographic function
I am trying to search how to do that, but I didn't find anything, can you help me?
Thank you
  4 Comments
John D'Errico
John D'Errico on 24 Jun 2019
Moved two answers to a comment:
"yes, but I don't know how to specify my fittype. In other word I don't know how can my fit follow the function y = (ax + b)/(cx + d)"
"Thank you to everyone. I did it using the fitting curve tool."

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