How do I make a fitting function with the fitting coefficient for x-data?

Hi.

I am trying to fit the experimental data to the mastercurve we have.

I have set of "xdata". Let's say I have [0,1,2,3,4,5].

Then, the master curve is the function of xdata. Let's say master = (xdata)^2.

Here, I also have ydata that corresponds to the xdata from the experiment. My whole set of data are xdata = [0,1,2,3,4,5] ydata = [0,1,2,3,4,5]

Here, I want to have a fitting coefficient multiplied on "xdata" to fit the ydata into mastercurve.

Which means, I will have new plot of ydata vs C*xdata and mastercurve as a function of C*xdata.

I tried to write out a fitting function but confused about the setting since the input parameter is changing for both raw data set and mastercurve. (I tried to use lsqcurvefit but xdata is changing so I am confused.)

Can anyone help me on this? I also want to obtain a R-squared value out of it.

Thank you very much!

- Sean

[Walter Roberson]

Merged into original http://uk.mathworks.com/matlabcentral/answers/261265-how-do-i-make-a-fitting-function-with-the-fitting-coefficient-for-x-data