homographic interpolation of experimental data point

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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
please learn to use comments, instead of adding multiple answers.
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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