The program is working. I used you example, just changed the formula and it worked. Thanks very much
I'll explain why I want to fit the diffuse appox. equation:
The program fit for the diffuse reflectance, R(r,t), for the sample.
The device:
We are using two fiber optics, one as emitter and the other as collector.
Results:
By fitting the curve, you can obtain optical properties of sample ( absorption coeff., scatter coeff prime and the distance between the fiber optics).
Thank you for your help.